Multi-displacer with rotational valving

Abstract

A multi-displacer assembly includes multiple fluid displacers that are driven out of phase with respect to each other. The assembly includes multiple pumps that each pump fluid downstream from the multi-displacer assembly. A rotating shaft rotates on a valve axis and provides active checking for fluid flow into and out of each of the multiple pumps.

Description

MULTI-DISPLACER WITH ROTATIONAL VALVINGCROSS-REFERENCE TO RELATED APPLICATIONThis application claims the benefit of U.S. Provisional Application No. 63 / 656,843 filed June 6, 2024 and entitled “MULTI-DISPLACER WITH ROTATIONAL VALVE,” and claims the benefit of U.S. Provisional Application No. 63 / 698,298 filed September 24, 2024 and entitled “MULTI-DISPLACER WITH ROTATIONAL VALVING,” the disclosures of which are hereby incorporated by reference in their entireties.BACKGROUNDThe present disclosure concerns fluid displacement. More specifically, the present disclosure concerns multiple displacer assemblies.Multiple piston pumps include multiple pistons that operate together to output a fluid flow from the pump. The pistons are driven out of phase with respect to each other. In such pumps fluid is prevented from returning to a piston cavity by the use of ball checks. Ball checks use a spring to push (bias) the ball back into the ball seat. A ball check functions relative to fluid pressure, with the ball unseating and allowing fluid to pass towards the fluid outlet as the piston downstrokes creating fluid pressure. The ball reseats at the end of the piston downstroke, when the exiting fluid pressure becomes less relative to the force exerted by ball check spring and such that the piston chamber can be refilled.SUMMARYAccording to an aspect of the present disclosure, a multi -displacer assembly includes an assembly body having an assembly inlet port and an assembly outlet port; a plurality of pumps arrayed around a valve axis and disposed radially outward from the valve axis, wherein each pump of the plurality of pumps includes a first pump valve disposed between the assembly inlet port and a pump chamber of the pump and a second pump valve disposed between the pump chamber of the pump and the assembly outlet port; and a valve shaft at least partially disposed within a valve bore in the assembly body, wherein the valve shaft mechanically actuates the first pump valve from a first open state to a first closed state and mechanically actuates the second pump valve from a second open state to a second closed state.According to an additional or alternative aspect of the present disclosure, a multi-displacer assembly includes an assembly body having an assembly inlet port and anassembly outlet port; a plurality of pumps arrayed around a valve axis and disposed radially outward from the valve axis, wherein each pump of the plurality of pumps includes a first pump valve disposed between the assembly inlet port and a pump chamber of the pump and a second pump valve disposed between the pump chamber of the pump and the assembly outlet port; and a valve shaft at least partially disposed within a valve bore in the assembly body. The valve shaft includes a first cam interfacing with the first pump valve of each pump of the plurality of pumps; and a second cam interfacing with the second pump valve of each pump, the second cam spaced axially from the first cam along the valve axis. The valve shaft is configured to rotate on a valve axis and the first cam mechanically actuates the first pump valve of each pump of the plurality of pumps from a respective first open state to a respective first closed state and the second cam mechanically actuates the second pump valve of each pump of the plurality of pumps from a respective second open state to a respective second closed state.According to another additional or alternative aspect of the disclosure, a multi-displacer assembly includes an assembly body having an assembly inlet port and an assembly outlet port; a plurality of pumps arrayed around a valve axis and disposed radially outward from the valve axis; and a rotational valve at least partially disposed within a valve bore within the assembly body, the valve bore fluidly connected to each pump of the plurality of pumps, the rotational valve configured to rotate on the valve axis to actively check fluid flow into and out of the plurality of pumps.According to yet another additional or alternative aspect of the disclosure, a multi-displacer assembly includes an assembly body having an assembly inlet port and an assembly outlet port; a plurality of pumps arrayed around a valve axis and disposed radially outward from the valve axis; and a rotational valve. Each pump of the plurality of pumps includes a fluid displacer configured to reciprocate along a pump axis, the fluid displacer at least partially disposed within a pump bore formed in the assembly body; and a pump chamber fluidly connected to a valve bore within the assembly body. The rotational valve is at least partially disposed in the valve bore and configured to rotate on the valve axis, the rotational valve includes a first valve passage open through an exterior of the rotational valve, the first valve passage fluidly connected to the assembly inlet port; and a second valve passage open through the exterior of the rotational valve, the second valve passage fluidly connected to the assembly outlet port. The rotational valve is configured to rotate between a first state the first valve passage is fluidly connected to a first subset of the plurality of pumps while the second valve passage is fluidly disconnected from the firstsubset and a second state in which the first valve passage is fluidly connected to a second subset of the plurality of pumps while the second valve passage is fluidly connected to the first subset of the plurality of pumps.According to yet another additional or alternative aspect of the disclosure, a multi-displacer assembly includes an assembly body having an assembly inlet port and an assembly outlet port; a rotational valve at least partially disposed in a valve bore within the assembly body; and a plurality of pumps. The rotational valve includes a valve shaft configured to rotate on a valve axis; a first valve flowpath formed within the valve shaft, the first valve flowpath fluidly connected to the assembly inlet port, the first flowpath including a first valve passage open through the valve shaft; and a second valve flowpath formed within the valve shaft, the second valve flowpath fluidly isolated from the first valve flowpath and fluidly connected to the assembly outlet port, the second valve flowpath including a second valve passage open through the valve shaft. The plurality of pumps are arrayed around the valve axis and disposed radially outward from the valve axis. Each pump of the plurality of pumps includes a fluid displacer configured to reciprocate along a pump axis, the fluid displacer at least partially disposed within a pump bore formed in the assembly body; and a pump chamber fluidly connected to the valve bore. The rotational valve is configured to rotate on the valve axis such that the first valve flowpath sequentially fluidly connects with the pumps of the plurality of pumps and such that the second valve flowpath sequentially fluidly connects with the pumps of the plurality of pumps out of sequence with the first valve flowpath.According to yet another additional or alternative aspect of the disclosure, a method of displacing fluid with a multi-displacer assembly includes driving reciprocation of a plurality of fluid displacers of a plurality of pumps, the plurality of pumps arrayed circumferentially around and radially outward of a valve axis; and rotating a rotational valve on the valve axis to sequentially fluidly connect and disconnect the plurality of pumps from an assembly inlet port that receives fluid into the multi-displacer assembly and sequentially fluidly connect and disconnect the plurality of pumps from an assembly outlet port that outputs the fluid from the multi-displacer assembly, the rotational valve fluidly isolating the assembly inlet port from the assembly outlet port throughout rotation.BRIEF DESCRIPTION OF THE DRAWINGSFIG. 1 is an isometric view of a multi-displacer assembly showing interior passages.FIG. 2 is a cross-sectional view taken along line 2-2 in FIG. 1.FIG. 3 A is a cross-sectional view taken along line 3-3 in FIG. 1.FIG. 3B is a cross-sectional view taken along line 3-3 in FIG. 1.FIG. 4A is a cross-sectional view taken along line 4-4 in FIG. 1.FIG. 4B is a cross-sectional view taken along line 4-4 in FIG. 1.FIG. 5 A is a cross-sectional view taken along line 5-5 in FIG. 1.FIG. 5B is a cross-sectional view taken along line 5-5 in FIG. 1.FIG. 5C is a cross-sectional view taken along line 2-2 in FIG. 1.FIG. 5D is a cross-sectional view taken along line 2-2 in FIG. 1.FIG. 5E is a cross-sectional view taken along line 5-5 in FIG. 1.FIG. 5F is a cross-sectional view taken along line 5-5 in FIG. 1.FIG. 5G is a cross-sectional view taken along line 2-2 in FIG. 1.FIG. 5H is a cross-sectional view taken along line 5-5 in FIG. 1.FIG. 51 is a cross-sectional view taken along line 2-2 in FIG. 1.FIG. 5J is a cross-sectional view taken along line 2-2 in FIG. 1.FIG. 5K is a cross-sectional view taken along line 5-5 in FIG. 1.FIG. 5L is a cross-sectional view taken along line 5-5 in FIG. 1.FIG. 5M is a cross-sectional view taken along line 2-2 in FIG. 1.FIG. 6A is a first isometric view of a rotational valve.FIG. 6B is a second isometric view of the rotational valve.FIG. 6C is a side elevational view of the rotational valve.FIG. 7 is an isometric view of a multi-displacer assembly.FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 7.FIG. 9 is a cross-sectional view taken along line 9-9 in FIG. 8.FIG. 10 is a cross-sectional view taken along line 10-10 in FIG. 8.FIG. 11 is an isometric view of a valve shaft.FIG. 12A-12L are enlarged views of detail 12 in FIG. 8 showing the multidisplacer assembly in different operating statesFIG. 13 is a graph illustrating output by a four piston multi-displacer assembly.FIG. 14 is a graph illustrating output by a five piston multi-displacer assembly.FIG. 15 is a block diagram showing a dispense system.DETAILED DESCRIPTIONThe present disclosure relates generally to multi-displacer assemblies. The multi-displacer assembly can be configured to pump fluid. The multi-displacer assembly can be configured to provide a metered output. According to aspects of the present disclosure, a multi-displacer assembly includes multiple fluid displacers that reciprocate out of phase with respect to each other to pump a fluid. The multi-displacer assembly includes multiple pumps that each include a fluid displacer that moves, such as by reciprocating linear motion, to pump the fluid. The multi-displacer assembly includes a rotational valve that provides active fluid checking for the inflow and outflow to each of the multiple pumps.Rotational valves according to aspects of the disclosure can actively check fluid flow to each pump of the multiple pumps of the displacer assembly. The rotational valves can additionally or alternatively actively check fluid flow out of each pump of the multiple pumps of the displacer assembly. The rotational valves can facilitate efficient operation with larger numbers of displacers, such as an odd number of displacers, while also reducing variation in the flow output.Multi-displacer assemblies according to some aspects of the present disclosure do not require ball valves or other valves to regulate the inflow and outflow of fluid, unlike traditional pumps. The rotational valve performs checking for each of the displacers of the multi-displacer pumping assembly. The rotational valve can simultaneously fluidly connect multiple of the pumps to the inlet of the displacer assembly. Additionally or alternatively, the rotational valve can simultaneously fluidly connect multiple of the pumps to the outlet of the displacer assembly.The rotational valve can provide active checking to pumps that are disposed other than 90-degrees out of phase relative to each other. According to some aspects of the disclosure, the rotational valve can be configured to synchronize fluid connections providing inflows and outflows to the multiple pumps. The rotational valve synchronizing flows to the multiple pumps facilitates operating the pumps out of phase, thereby providing even, steady output.In some examples, the rotational valve can provide active checking by regulating actuation of inlet and outlet valves for the multiple displacers of the assembly. According to some aspects of the disclosure, the rotational valve can guide opening and closing of inlet and outlet valves of the pumps to provide for a smooth, consistent output at a desired pressure and flowrate.The fluid displacers of the multiple pumps of the multi-displacer pumping assembly can be driven out of phase with respect to each other. Driving the fluid displacers out of phase facilitates continuous outflow from the multi-displacer pumping assembly. According to aspects of the disclosure, the fluid displacers can be driven by drive, such as a wobble drive, a cam drive, or any suitable drivetrain that allows for phasing of the multiple fluid displacers. The rotational valve can be connected to the driveshaft that provides a rotational input to the drive. The rotational valve can be configured to rotate in a 1 :1 relationship with rotation of the drive.In some examples, the multi-displacer pumping assembly with active checks can be used for fluid metering, such as with liquid proportioning in the liquid finishing market. In some examples, the multi-displacer pumping assembly with active checks may be driven in reverse with a motive fluid (e.g., compressed air or non-compressible hydraulic fluid) to serve as a motor (i.e., outputting a rotational force).Components can be considered to radially overlap when those components are disposed at common axial locations along an axis. A radial line extending from the axis will extend through each of the radially overlapping components. Components can be considered to axially overlap when those components are disposed at common radial and circumferential locations relative to an axis such that an axial line parallel to the axis extends through the axially overlapping components. Components can be considered to circumferentially overlap when aligned about the axis, such that a circle centered on the axis passes through the circumferentially overlapping components.FIG. 1 is an isometric view of multi-displacer assembly 10. FIG. 2 is a cross-sectional view taken along line 2-2 in FIG. 1. FIG. 3 A is a cross-sectional view taken along line 3-3 in FIG. 1. FIG. 3B is a cross-sectional view taken along line 3-3 in FIG. 1. FIG. 4A is a cross-sectional view taken along line 4-4 in FIG. 1. FIG. 4B is a cross- sectional view taken along line 4-4 in FIG. 1. FIGS. 1-4B are discussed together. Multidisplacer assembly 10 includes assembly body 12, drive 14, pumps 16, rotational valve 18, valve bore 20, assembly port 22a, 22b, assembly passages 24a, 24b, pump bores 26, feed ports 28a, 28b, feed passages 30a, 30b, and bearing 32. Drive 14 includes driveshaft 34, eccentric 36, and plate 38. Pumps 16 each include displacer 40 and seal assembly 42. Rotational valve 18 includes valve shaft 44, valve flowpaths 46a, 46b, valve ports 48a, 48b, valve passages 50a, 50b, and outer apertures 52a, 52b.Multi-displacer assembly 10 is configured to output a fluid for dispensing, such as dispensing on a substrate. For example, multi-displacer assembly 10 can beconfigured to dispense higher viscosity fluids (e.g., sealant, adhesive, foam, gasketing material, among other options). In some examples, the multi-displacer assembly 10 can be configured to produce sufficient outlet fluid pressure to create fluid atomization at a nozzle outlet, thereby allowing the system to be used in airless spraying applications, such as disclosed in United States Patent No. 9,914,141 (‘141 Patent) and United States Pre-Grant Publication 2017 / 0165692, the disclosure of which is herein incorporated by reference in its entirety.Multi-displacer assembly 10 includes active checking in which the fluid checks are provided by a portion of the pump drivetrain. In the example shown, the active checking is provided by rotational valve 18 while the multiple displacers 40 are driven out of phase relative to each other. The rotational valve 18 connects multiple pumps 16 to the inflow received through the assembly port 22a and simultaneously connects multiple of the pumps 16 to provide outflow through the assembly port 22b. While assembly port 22a is described as an inlet port and assembly port 22b is described as an outlet port, it is understood that multi-displacer assembly 10 can be configured to provide flow in either direction. In some cases, inflow can be provided through assembly port 22b and outflow can be provided through assembly port 22a.Active checking may provide more exact amounts of fluid dispense (e.g.., more exact doses) as compared to checking with balls or other discrete valve members. Active checking can also provide for smoother fluid flow by eliminating vibration generated by a ball reseating to close flowpaths in assemblies including ball check valves. Active checking with rotational valve 18 further facilitates having a greater and / or odd number of displacers 40 that are driven out of phase relative to each other. Such a configuration allows for balancing of the changeover, at which point a displacer 40 switches from displacing in one direction to displacing in the other direction, which allows for smoother flow and reduces pulsation in the output from multi-displacer assembly 10.Assembly body 12 supports other components of multi-displacer assembly 10. In the example shown, pump bores 26 of the multiple pumps 16 are formed in the assembly body 12. As such, assembly body 12 can be considered to form a pump body for multiple, up to all, of the pumps 16.For each pump 16, the displacer 40 is at least partially disposed within the assembly body 12. The displacer 40 is elongate along a pump axis PA. The displacer 40 is configured to reciprocate along the pump axis PA of the pump 16 with which that displacer 40 is associated to pump the fluid. The displacer 40 is configured to move throughmultiple pump cycles to pump the fluid. A pump cycle includes a pressure stroke, in which the displacer 40 moves in direction AD2, and a fill stroke, in which displacer 40 moves in direction ADI. In the example shown, pumps 16 are configured such that fluid is filled into the pump chamber 94 during a fill stroke and fluid is output from pump chamber 94 during a pressure stroke. The fluid displacers 40 can be configured as pistons, plungers, or other type of fluid mover.The displacer 40 is connected to drive 14 to receive a reciprocating input from drive 14. Tn the example shown, the drive 14 is formed as a wobble drive through it is understood that other configurations are possible. The rotational input for the wobble drive (or similar drive, e.g., cam) may be provided by various motors, such as described in Paragraph

[0050] of United States Patent Application Publication 2017 / 0165692, assigned to Graco Minnesota Inc., with the disclosure of U.S. Patent Application Publication 2017 / 0165692 incorporated by reference in its entirety. The drive 14 can be connected to an electric motor to receive a rotational input from the electric motor, among other motor types.The drive 14 is configured to drive the fluid displacers 40 of the pumps 16 out of phase relative to each other. The drive 14 includes a driveshaft 34 that is configured to receive the rotational input. The drive 14 is configured to convert that rotational input into reciprocating linear motion that is provided to fluid displacers 40 to displace fluid displacers 40 and cause pumping by the multi-displacer assembly 10. In the example shown, the drive 14 includes a plate 38 that is mounted on an eccentric 36. The eccentric is formed monolithically with driveshaft 34 in the example shown. Rotation of the eccentric 36 causes the plate 38 to wobble to cause movement of the displacers 40. In some examples, drive 14 interfaces with displacers 40 such that drive 14 can exert force to move the displacer 40 through a pressure stroke in axial direction AD2 but can be disconnected from displacers 40 to not actively move the displacer 40 in direction ADI. In such an example, the pressure of the inflow to multi-displacer assembly 10 can move the displacer 40 through the fill stroke. The drive 14 can limit movement of the displacer 40 in axial direction ADI during the fill stroke, such as by plate 38 axially overlapping with the fluid displacer 40. In other examples, the drive 14 can be drivingly connected to the displacers 40 to move the displacer 40 in both the axial directions ADI, AD2 and through both pressure and fill strokes. As such, the drive 14 interface with the fluid displacer 40 throughout a pump cycle while being drivingly disconnected from the displacer 40 during a fill stroke.Rotational valve 18 is connected to drive 14 to receive a rotational input from drive 14. The drive 14 is configured to rotatably drive rotational valve 18 on drive axis DA. Rotational valve 18 is configured to rotate on valve axis VA. The valve axis VA is disposed coaxially with drive axis DA in the example shown. Drive 14 interfaces with rotational valve 18 at a rotation lock that inhibits relative rotation between drive 14 and rotational valve 18. In some examples, drive 14 and rotational valve 18 are connected by a keyed interface that inhibits relative rotation. Such a keyed interface can allow drive 14 to transmit rotation to drive rotational valve 18 in either rotational direction RD1 or RD2. As such, the configuration of the assembly ports 22a, 22b can be reversed such that flow is received through assembly port 22b and output through assembly port 22a. In the example shown, a projection of the driveshaft 34 is received within a bore of valve shaft 44 to form the keyed interface, through it is understood that in various other examples a portion of valve shaft 44 can be received in a bore of the driveshaft 34, among other connection options.In the example shown, the drive 14 is configured to both convert rotational motion to linear motion and to transmit the rotational motion to provide a rotational output to rotational valve 18.Bearing 32 supports rotational valve 18. Bearing 32 is disposed within assembly body 12. Bearing 32 is configured to rotatably support valve shaft 44. In the example shown, bearing 32 rotatably supports rotational valve 18 relative to assembly body 12 and rotationally supports drive 14 relative to assembly body 12. The bearing 32 is shown as a dual bearing formed by axially stacked ball bearing assemblies, through it is understood that other configurations are possible. The bearing 32 is disposed axially between the drive 14 and the fluid pathways through assembly body 12. The bearing 32 is disposed axially between the drive 14 and the fluid pathways through rotational valve 18.Assembly port 22a is formed in assembly body 12. Assembly port 22a is formed through a lateral side 54 of assembly body 12. In the example shown, the assembly body 12 includes a flat lateral side 54a through which the assembly port 22a is formed. The assembly body 12 also includes a curved lateral side 54b. Assembly port 22b is formed in assembly body 12. Assembly port 22b is formed through a lateral side 54 of assembly body 12. Assembly port 22b is formed through the flat lateral side 54a. In the example shown, the assembly port 22a and the assembly port 22b are stacked on the flat lateral side 54a. The assembly ports 22a, 22b axially overlap relative to the drive axis DA. The assembly ports 22a, 22b axially overlap relative to the valve axis VA. Having assembly port 22a andassembly port 22b through the same lateral side 54 of assembly body 12 facilitates easy and quick access to both ports, reducing downtime to access such ports and providing for easier and more efficient servicing. Forming assembly ports 22a, 22b through flat lateral side 54a provides easy access for a user to connect lines to assembly ports 22a, 22b.For purposes of discussion, multi-displacer assembly 10 will be considered to receive an inflow through the assembly port 22a and to output an outflow through assembly port 22b. As discussed above, however, multi-displacer assembly 10 can be operated to receive an inflow through assembly port 22b and to output an outflow through assembly port 22a.Valve bore 20 is formed in assembly body 12. Valve bore 20 is open through a top side 55 of assembly body 12. Assembly passage 24a extends between assembly port 22a and valve bore 20. Assembly passage 24a fluidly connects assembly port 22a and valve bore 20. Assembly passage 24b extends between assembly port 22b and valve bore 20. Assembly passage 24a fluidly connects valve bore 20 and assembly port 22b.Feed passages 30a, 30b extend between valve bore 20 and the pump bores 26. In the example shown, each pump bore 26 is associated with a separate feed passage 30a and a separate feed passage 30b. Each feed passage 30a is configured to provide (or receive if flow is reversed) fluid to a single pump bore 26. Each feed passage 30b is configured to receive (or provide if flow is reversed) fluid to a single pump bore 26. Feed passages 30a, 30b are formed in assembly body 12. In some examples, feed passages 30a, 30b can be formed by machining bores through assembly body 12 from the lateral side 54 and into valve bore 20. Such a configuration can allow assembly body 12 to be formed as a single, monolithic block, simplifying manufacturing and reducing costs. In the example shown, the bores forming feed passages 30a, 30b are formed through curved lateral side 54b and plugged.Feed passages 30a, 30b project radially outward from valve axis VA in the example shown. The feed passages 30a, 30b are disposed in a spoked configuration and radiate outward from valve axis VA. In the example shown, each feed passage 30a, 30b extends orthogonal to a plane tangential to the curved lateral side 54. Such a configuration efficiently disposes the feed passages 30a, 30b to connect the pump bores 26 and the valve bore 20. Bore plugs 46 can be inserted to close the outer end of feed passages 30a, 30b and the bore plugs 46 are recessed from curved lateral side 54b, providing for a smooth exteriorof assembly body 12. Recessing the bore plugs 46 also protects bore plugs 46 from contact damage.Feed passages 30b are disposed similar to feed passages 30a. Feed passages 30b can be stacked with feed passages 30a. Feed passages 30b can be aligned with feed passages 30a such that feed passages 30b axially overlap with the feed passages 30a relative to the valve axis VA.Feed passages 30a, 30b are evenly arrayed about valve axis VA in the example shown. The pump bores 26 are evenly arrayed about valve axis VA. In the example shown, the pump bores 26 are disposed 60-degrees apart from each other about the valve axis VA for the five pump bores 26. It is understood that the pump bores 26 can be disposed closer together or further apart depending on the number of pump bores 26. Evenly arraying the pump bores 26 circumferentially about the valve axis VA provides for out of phase and sequenced pumping by the pumps 16 to provide even flow and reduce pulsation in the outflow.Each of assembly passages 24a, 24b and feed passages 30a, 30b intersect with valve bore 20 to fluidly connect to valve bore 20. In the example shown, the valve bore 20 includes bore shoulders 96. Bore shoulders 96 extend radially inward such that the diameter of the valve bore 20 reduces as valve bore 20 extends in axial direction AD2. The bore shoulders 96 are disposed at different axial locations along the valve bore 20. As such, in the example shown, the valve bore 20 includes multiple bore sections 98a-98c through which fluid flows. Bore section 98a is disposed furthest in axial direction ADI and bore section 98c is disposed furthest in axial direction AD2. Bore section 98b is disposed axially between bore sections 98a, 98c. Bore section 98a has a larger diameter than bore section 98b. Bore section 98b has a larger diameter than bore section 98a. In the example shown, the assembly port 22a intersects with valve bore 20 within bore section 98a, the feed passages 30a intersect with valve bore 20 within bore section 98b, and the feed passages 30b intersect with valve bore 20 within bore section 98c. In the example shown, assembly passage 24b further intersects with valve bore 20 within bore section 98c.In the example shown, the valve shaft 44 has a varied diameter along its length to interface with the varied diameter within the valve bore 20. Such an interface can axially locate the valve shaft 44 within the valve bore 20. Such a configuration locates the valve shaft 44 to properly align fluid passages through rotational valve 18 with fluid passages within assembly body 12. Stepping down the diameter of valve bore 20 such that a diameter of valve bore 20 reduces as the valve bore 20 extends axially into assembly body12 also allows for easy assembly and disassembly of rotational valve 18 from assembly body 12. The rotational valve 18 can be installed by shifting rotational valve 18 axially in axial direction AD2 into valve bore 20. The rotational valve 18 can be removed by shifting rotational valve 18 axially in axial direction ADI and out of valve bore 20. Such a configuration provides for quick and easy access for maintenance and / or replacement.Rotational valve 18 is at least partially disposed in valve bore 20. Valve shaft 44 is connected to drive 14 to be rotatably driven by drive 14. The valve shaft 44 can, in some examples, project out of valve bore 20. Valve shaft 44 is configured to rotate on valve axis VA and to check fluid flow into and out of pump bores 26. Valve flowpaths 46a, 46b direct fluid within and through rotational valve 18. The valve flowpaths 46a, 46b direct fluid between the assembly passage 24a and feed passages 30a and between feed passages 30b and assembly passage 24b. Valve flowpath 46a is configured to fluidly connect assembly passage 24a and feed passage 30a. Valve flowpath 46b is configured to fluidly connect feed passage 30b and assembly passage 24b. Rotational valve 18 is configured to intermittently and sequentially fluidly connect the assembly passage 24a with the feed passages 30a and intermittently and sequentially fluidly connect the feed passages 30b with the assembly passage 24b.Valve seals 58 are configured to engage with valve shaft 44 and assembly body 12 to provide fluid seals therebetween. In some examples, one or more valve seals 58 are supported by assembly body 12 and valve shaft 44 rotates relative to valve seals 58. In additional or alternative examples, one or more valve seals 58 are supported by valve shaft 44 such that the valve seal 58 rotates with the valve shaft 44.In the example shown, valve seals 58a, 58b axially define an inlet chamber within the valve bore 20. The valve seal 58a can provide a backup seal for valve seal 58b. Valve seal 58c axially defines an opposite end of the inlet chamber, is disposed axially between and fluidly separates the inlet chamber from the feed passages 30a. The valve seals 58d are disposed axially between and fluidly separate the feed passage 30a and the feed passage 30b. The valve seal 58e is disposed axially between and fluidly separates an outlet chamber within the valve bore 20 from the feed passage 30b.The rotational valve 18 simultaneously fluidly connects multiple of the feed passages 30a to assembly passage 24a while fluidly disconnecting multiple of the feed passages 30a of others of the pumps 16 from the assembly passage 24a. The rotational valve 18 simultaneously fluidly connects multiple of the feed passages 30b to the assembly passage 24b while fluidly disconnecting multiple of the feed passages 30b of others of thepumps 16 from the assembly passage 24b. The rotational valve 18 is configured such that the flow through assembly passage 24a is fluidly isolated from the flow through assembly passage 24b throughout operation. In such an example, rotational valve 18 can fluidly connect multiple pumps 16 to the assembly passage 24a, fluidly connect multiple other pumps 16 to the assembly passage 24b, and further fluidly disconnect one or more additional pumps 16 from both the assembly passages 24a, 24b.Valve flowpaths 46a, 46b extend through valve shaft 44. Valve passage 50a is configured to fluidly connect assembly passage 24a to feed passages 30a. Valve passage 50b is configured to fluidly connect assembly passage 24b to feed passages 30b. Valve passages 50a, 50b extend within valve shaft 44 and are open through the exterior of valve shaft 44 to both receive and output the fluid.Valve port 48a is formed through valve shaft 44. Valve port 48a is fluidly connected to valve passage 50a. Valve port 48a is fluidly connected to assembly passage 24a In the example shown, the rotational valve 18 includes a plurality of valve ports 48a that are disposed circumferentially about valve shaft 44, though it is understood that not all examples are so limited.Groove 60 is formed in the exterior of valve shaft 44. Valve port 48a is open through groove 60 in the example shown. Groove 60 extends annularly about valve shaft 44 in the example shown. Groove 60 allows for formation of an annular flow chamber between valve shaft 44 and the structure defining valve bore 20. Such an annular flow chamber facilitates even, consistent flow of fluid to the array of valve ports 48a. While groove 60 is shown as formed on valve shaft 44, it is understood that in various other examples the groove 60 can be formed as a portion of valve bore 20.Shaft bore 62 extends into valve shaft 44. Shaft bore 62 extends into a second end of valve shaft 44 opposite the first end of valve shaft 44 that is configured to receive the rotational input from drive 14. Shaft bore 62 is divided to define a shaft passage 64a and shaft passage 64b. In the example shown, valve plug 66 is mounted to valve shaft 44 and fluidly separates shaft passage 64a and shaft passage 64b. For example, valve plug 66 can be threadedly connected to valve shaft 44. It is understood that shaft passage 64a and shaft passage 64b can be configured in any desired manner for directing fluid within valve shaft 44.Valve passage 50a is open through the exterior of valve shaft 44. Valve passage 50a is formed as an arced passage in the example shown. Valve passage 50aextends at least partially about the valve axis VA. The valve passage 50a is configured to provide an outlet (or inlet in a reverse flow configuration) for the valve flowpath 46a.As best seen in FIGS. 3A and 3B, the valve passage 50a can be configured to partially overlap with multiple feed passages 30a and to fully overlap with one or more additional feed passages 30a such that a majority of the feed passages 30a are fluidly connected to the valve passage 50a. The valve shaft 44 rotates on valve axis VA decreasing overlap with a trailing one of the feed passages 30a and increasing overlap with a leading one of the feed passages 30a. The rotational valve 18 fluidly disconnects from one of the feed passages 30a while the valve passage 50a fully overlaps with multiple of the feed passages 30a. The rotational valve 18 is configured such that multiple of the feed passages 30a are fluidly connected to valve flowpath 46a regardless of the rotational position of the rotational valve 18.The valve passage 50a is open circumferentially at angle a. In the example shown, the angle a is sized to fluidly connect at least two feed passages 30a to valve flowpath 46a throughout operation. In the example shown, the angle a is sized to fluidly connect more than two feed passages 30a to valve flowpath 46a at various times during operation. In some examples, the angle a can be about 135-degrees or greater. In some examples, the angle a can be less than or up to about 170-degrees. In some examples, the angle a can up to about 140-degrees. In some examples, the angle a can up to about 135- degrees. It is understood that other sizes of angle a are possible, particularly in examples including more or less than five pumps 16.As best seen in FIGS. 4 A and 4B, the valve passage 50b can be configured to partially overlap with multiple feed passages 30b and to fully overlap with one or more additional feed passages 30b such that a majority of the feed passages 30b are fluidly connected to the valve passage 50b. The valve shaft 44 rotates on valve axis VA decreasing overlap with a trailing one of the feed passages 30b and increasing overlap with a leading one of the feed passages 30b. The rotational valve 18 fluidly disconnects from one of the feed passages 30b while the valve passage 50b fully overlaps with multiple of the feed passages 30b. The rotational valve 18 is configured such that multiple of the feed passages 30b are fluidly connected to valve flowpath 46b regardless of the rotational position of the rotational valve 18.Valve passage 50b is open through the exterior of valve shaft 44. Valve passage 50b is formed as an arced passage in the example shown. Valve passage 50b extends at least partially about the valve axis VA. The valve passage 50b is configured toprovide an inlet (or outlet in a reverse flow configuration) for the valve flowpath 46b. The valve passage 50b is open circumferentially at angle 0. In the example shown, the angle 0 is sized to fluidly connect at least two feed passages 30b to valve flowpath 46b throughout operation. In the example shown, the angle 0 is sized to fluidly connect more than two feed passages 30b to valve flowpath 46b at various times during operation. In some examples, the angle 0 can be about 135-degrees or greater. In some examples, the angle 0 can be less than or up to about 170-degrees. In some examples, the angle 0 can up to about 140- degrees. In some examples, the angle 0 can up to about 135-degrees. It is understood that other sizes of angle 0 are possible, particularly in examples including more or less than five pumps 16.Valve port 48b is formed through valve shaft 44. Valve port 48b is fluidly connected to shaft passage 64b. Shaft passage 64b extends between valve passage 50b and valve port 48b to fluidly connect valve passage 50b and valve port 48b. In the example shown, the rotational valve 18 includes a single axially oriented valve port 48v, through it is understood that not all examples are so limited. For example, rotational valve 18 can include multiple valve ports 48b. Additionally or alternatively, the valve port 48b can be oriented radially rather than axially.Pumps 16 are arrayed circumferentially about the valve axis VA. The pump bores 26 are disposed radially outward from valve axis VA. In the example shown, the pump bores 26 are evenly arrayed about valve axis VA and evenly spaced from valve axis VA. The pump bores 26 circumferentially overlap with each other about the valve axis VA in the example shown.For each pump 16, the fluid displacer 40 is at least partially disposed in the pump bore 26. The fluid displacer 40 projects out of the pump bore through seal assembly 42. The fluid displacer 40 interfaces with drive 14 to receive a driving input from drive 14. The fluid displacers 40 are each configured to reciprocate on a pump axis PA to pump the fluid. The pump axes PA of the multiple pumps 16 are disposed parallel to and are radially offset from valve axis VA in the example shown. The fluid displacers 40 can be formed as pistons, plungers, diaphragms, among other options. The fluid displacers 40 are arrayed about the valve axis VA. The fluid displacers 40 are evenly arrayed about the valve axis VA in this example.In the example shown, the drive 14 is configured to directly drive the fluid displacers 40 through a pressure stroke and are configured to interface with the fluid displacers 40 through a fill stroke. In the example shown, displacer caps 68 are configuredto interface with drive 14 and interface with the fluid displacer 40. For example, the displacer cap 68 can at least partially receive a head 70 of the fluid displacer 40. The displacer cap 68 can be configured to pivot on the head 70 such that the displacer cap 68 maintains a desired contact orientation relative to the head 70 and the plate 38. Such a configuration can assist in maintaining concentricity of the fluid displacer 40 on the pump axis PA, preventing wear and increasing operable life. The displacer cap 68 interfaces with the plate 38 of the drive 14. The plate 38 pushing downward in axial direction AD2 drives the displacer cap 68 and fluid displacer 40 downward in axial direction AD2 and through a pressure stroke.In some examples, the displacer cap 68 is mechanically disconnected from the plate 38 such that the plate 38 does not exert a driving force in axial direction ADI. In such an example, the displacer cap 68 can be configured to slide on plate 38, further assisting in maintaining concentricity. The feed pressure of the fluid provided to pump chamber 94 can drive the fluid displacer 40 in axial direction ADI, maintaining the interface between plate 38 and fluid displacer 40. Plate 38 can limit movement of fluid displacer 40 in axial direction ADI, maintaining a desired displacement rate and fill rate into the pump chamber 94. Displacer cap 68 being disconnected from plate 38 prevents plate 38 from exerting side loading on fluid displacers 40, assisting in maintaining concentricity of the fluid displacer 40 on the pump axis PA. Maintaining concentricity inhibits wear on fluid displacer 40 and provides for efficient pumping, decreasing costs and reducing downtime.In the example shown, fluid displacer 40 extends through seal assembly 42. Seal assembly 42 prevents fluid from leaking out of pump bore 26 along fluid displacer 40. In the example shown, the seal assembly 42 includes displacer seal 72 and seal support 74. The displacer seal 72 engages with the assembly body 12 and fluid displacer 40 and seals against the assembly body 12 and fluid displacer 40. The displacer seal 72 can be configured as a u-cup seal among other options. In some examples, displacer seal 72 is configured to be energized by the fluid pressure within pump chamber 94. Displacer seal 72 provides a dynamic sealing interface between the moving fluid displacer 40 and the static assembly body 12. Seal support 74 can brace displacer seal 72 and hold displacer seal 72 in pump bore 26. Seal support 74 can include a cap and one or more spacers, among other options.FIGS. 5A-5M are cross-sectional views of multi-displacer assembly 10.FIGS. 5A, 5B, 5E, 5F, 5H, 5K, and 5L are cross-sectional views taken along line 5-5 inFIG. 1. FIGS. 5C, 5D, 5G, 51, 5 J, and 5M are cross-sectional views taken along line 2-2 in FIG. 1. FIGS. 5A-5M show multi-displacer assembly 10 in various states of operation. FIGS. 5 A-5M are discussed together and with continued reference to FIGS. 1-4B. A single pump 16 is shown and discussed with regard to FIGS. 5A-5M. It is understood that each pump 16 can operate in the same manner, but out of phase with respect to each other. In the example discussed with regard to FIGS. 5A-5M, the drive 14 is driven in rotational direction RD 1.It is understood that a feed passage 30a is considered to be fluidly connected to valve flowpath 46a when the outer aperture 52a of valve passage 50a radially overlaps with the feed port 28a of the feed passage 30a. The feed passage 30a is considered to be fluidly disconnected form the valve flowpath 46a when the outer aperture 52a does not radially overlap with the feed port 28a of the feed passage 30a. Similarly, a feed passage 30b is considered to be fluidly connected to valve flowpath 46b when the outer aperture 52b of valve passage 50b radially overlaps with the feed port 28b of the feed passage 30b. The feed passage 30b is considered to be fluidly disconnected form the valve flowpath 46b when the outer aperture 52b does not radially overlap with the feed port 28b of the feed passage 30b.In FIG. 5A, the drive 14 is at a 0-degree rotational position and the fluid displacer 40 is at a bottom of a pressure stroke in axial direction AD2. Both the feed ports 28a, 28b are closed. The feed passage 30a is fluidly disconnected from the valve flowpath 46a. The feed passage 30b is fluidly disconnected form the valve flowpath 46b.In FIG. 5B, the rotational valve 18 is rotated in rotational direction RD1 from the position in FIG. 5 A. In this example, the rotational valve 18 is rotated 6-degrees from the position in FIG. 5A to the position in FIG. 5B. The feed port 28a begins to open as the valve passage 50a moves to overlap with the feed port 28a. The fluid can begin to flow through valve flowpath 46a and into the pump chamber 94. The valve shaft 44 maintains the feed port 28b in a closed state to prevent flow through feed port 28b. The fluid displacer 40 can be going through changeover and / or beginning to displace through the fill stroke.In FIG. 5C, the rotational valve 18 is rotated to 45-degrees offset from the initial state shown in FIG. 5A. The overlap between the valve passage 50a and feed port 28a increases and feed port 28a is fully overlapped by valve passage 50a. The fluid flows through valve flowpath 46a and into pump chamber 94. The fluid displacer 40 displaces in axial direction ADI and through a fill stroke. The fluid flow into pump chamber 94 canbe pressurized such that the fluid inflow displaces the fluid displacer 40 in axial direction ADI.In FIG. 5D, the rotational valve 18 is rotated to 90-degrees offset from the initial state shown in FIG. 5A. The feed port 28a is fully overlapped by valve passage 50a and fluid continues to fill into pump chamber 94 as fluid displacer 40 displaces in axial direction ADI and through the fill stroke.In FIG. 5E the rotational valve 18 is rotated to 135-degrees offset from the initial state shown in FIG. 5 A. The valve port 48a is fully overlapped by valve passage 50a and fluid continues to fill into pump chamber 94 as fluid displacer 40 displaces in axial direction ADI and through the fill stroke. The pump bore 26 forms a trailing pump bore 26 relative to the rotation of rotational valve 18 with rotational valve 18 in the state shown in FIG. 5E.In FIG. 5F, the rotational valve 18 is rotated to 174-degrees offset from the initial state shown in FIG. 5A. The feed port 28a is only partially overlapped by valve passage 50a and fluid continues to fill into pump chamber 94 as fluid displacer 40 displaces in axial direction ADI and through the fill stroke. The feed passage 30a is closing and is partially open in FIG. 5F. The fluid displacer 40 can be decelerating into changeover with pump 16 in the state shown in FIG. 5F.In FIG. 5G, the rotational valve 18 is rotated to 180-degrees offset from the initial state shown in FIG. 5A. The feed port 28a is fluidly disconnected from valve passage 50a. The feed port 28b remains fluidly disconnected from valve passage 50b. The fluid displacer 40 is at an end of the fill stroke in axial direction ADI and is changing over from the fill stroke to a pressure stroke in axial direction AD2. The feed port 28a is closing between the states shown in FIGS. 5E and 5G and is fully closed in FIG. 5G.In FIG. 5H, the rotational valve 18 is rotated to 186-degrees offset from the initial state shown in FIG. 5A. The feed port 28b begins to open as the valve passage 50b moves to overlap with the feed port 28b. The fluid can begin to flow from the pump 16 and through valve flowpath 46b and out of multi-displacer assembly 10 through assembly port 22b. The valve shaft 44 maintains the feed port 28a in a closed state to prevent flow through feed port 28a. The pump 16 remains fluidly disconnected from valve flowpath 46a and assembly passage 24a. While the illustrated pump 16 is fluidly disconnected from the flow through assembly passage 24a, others of the pumps 16 rotationally ahead of pump 16 are fluidly connected to assembly passage 24a through valve flowpath 46a.In FIG. 51, the rotational valve 18 is rotated to 225-degrees offset from the initial state shown in FIG. 5A. The overlap between the valve passage 50b and feed port 28b increases from the state shown in FIG. 5H and feed port 28b is fully overlapped by valve passage 50b. The pump bore 26 forms a leading pump bore 26 relative to the valve passage 50b with the rotational valve 18 in the states shown in FIGS. 5H and 51. The fluid displacer 40 displaces in axial direction AD2 and through the pressure stroke. The fluid displacer 40 drives fluid from pump chamber 94 into valve flowpath 46b and through valve passage 50b. The fluid flows downstream from valve bore 20 and out through rotational valve 18 and assembly port 22b.In FIG. 5 J, the rotational valve 18 is rotated to 270-degrees offset from the initial state shown in FIG. 5A. The feed port 28b is fully overlapped by valve passage 50b and fluid continues to be driven out of pump chamber 94 as fluid displacer 40 displaces in axial direction AD2 and through the pressure stroke.In FIG. 5K, the rotational valve 18 is rotated to 315-degrees offset from the initial state shown in FIG. 5A. The feed port 28b is fully overlapped by valve passage 50b and fluid continues be driven out of pump chamber 94 as fluid displacer 40 displaces in axial direction AD2 and through the pressure stroke. The pump bore 26 forms a trailing pump bore 26 relative to the rotation of rotational valve 18 with the multi-displacer assembly 10 in the state shown in FIG. 5K.In FIG. 5L, the rotational valve 18 is rotated to 354-degrees offset from the initial state shown in FIG. 5A. The feed port 28b is only partially overlapped by valve passage 50b and fluid continues to be driven out of pump chamber 94 as fluid displacer 40 displaces in axial direction AD2 and through the pressure stroke. The feed passage 30b is closing and is partially open in FIG. 5F.In FIG. 5M, the rotational valve 18 has completed a full 360-degree rotation and returned to the state shown in FIG. 5A. The feed port 28a is fluidly disconnected from valve passage 50a. The feed port 28b is fluidly disconnected from valve passage 50b. The fluid displacer 40 is at an end of the pressure stroke in axial direction AD2 and is changing over from the pressure stroke to a fill stroke in axial direction ADI. The feed passage 30b is closing between the states shown in FIGS. 5K and 5A and is fully closed in FIG. 5A. The drive 14 continues to rotate in rotational direction RD1 and multi-displacer assembly 10 continues through the states in FIGS. 5A-5L to pump the fluid.Multi-displacer assembly 10 provides significant advantages. The rotational valve 18 fluidly connects and disconnects multiple pumping chambers 94 ofmultiple pumps 16 to both the inflow of fluid to multi-displacer assembly 10 and the outflow of fluid from multi-displacer assembly 10. The fluid displacers 40 are driven out of phase relative to each other, which provides for a smooth outflow and reduces pulsation. The rotational valve 18 sequentially connects and disconnects the pumps 16 from the inflow to and outflow from multi-displacer assembly 10. The sequential fluid connection facilitates out of phase driving of multiple fluid displacers 40, particularly of fluid displacers 40 disposed other than 90-degrees out of phase. Such a configuration can provide for a smooth flow output from multi-displacer assembly 10.Rotational valve 18 is a single valve that provides fluid checking for each of the multiple pumps 16. The rotating valve provides fluid checking for both inflow to the pumps 16 and outflow from the pumps 16. The rotational valve 18 ensures the inflows and outflows of the various pumps 16 are properly synched to provide a consistent flow from multi-displacer assembly 10. The multi-displacer assembly 10 does not require separate check valves (e.g., ball checks) that can require maintenance and require time to reseat during changeover, which can lead to vibration and pulsation. Rotational valve 18 can provide for smoother, more even flow while also reducing noise.Drive 14 is configured to cause linear displacement of fluid displacers 40 and rotational displacement of rotational valve 18. The drive 14 provides a single dynamic input to multi-displacer assembly 10 that causes both pumping and active checking of the pumps 16. The rotational valve 18 rotates in a 1 : 1 configuration with the drive 14, such that multi-displacer assembly 10 does not require complicated gearing to change rotational speeds. The drive 14 providing both linear input to the fluid displacers 40 and rotational input to rotational valve 18 links fluid displacers 40 and rotational valve 18 to ensure desired alignment and checking of flowpaths at desired times during the stroke of the fluid displacer 40.Multi-displacer assembly 10 can be utilized across multiple dispense operations and for multiple purposes. For example, multi-displacer assembly 10 can be configured for dispensing of a high viscosity fluid (e.g., without limitation, a sealant, adhesive, foam, or gasketing material). In some examples, multi-displacer assembly 10 is configured to produce sufficient outlet fluid pressure to create fluid atomization at a nozzle outlet (not shown), thereby allowing the system to be used in airless spraying applications. In some examples, multi-displacer assembly 10 can be used as a meter (i.e., a dosing pump), such as the fluid meters (or dosing pumps) used with a liquid proportioner. In some examples, multi-displacer assembly 10 is not used as a fluid pump but instead as an airmotor when driven with compressed air in order to create a rotational force (or multiple, phased linear forces if not coupled with a drive 14).FIG. 6A is a first isometric view of rotational valve 18. FIG. 6B is a second isometric view of rotational valve 18. FIG. 6C is a side elevational view of rotational valve 18. FIGS. 6A-6C are discussed together. Valve shaft 44, valve ports 48a, 48b, valve passages 50a, 50b, and groove 60 of rotational valve 18 are shown.Valve shaft 44 is configured to be at least partially disposed within valve bore 20. Valve shaft 44 is configured to rotate on valve axis VA to sequentially fluidly connect and disconnect feed passages 30a from valve passage 50a and to sequentially fluidly connect and disconnect feed passages 30b from valve passage 50b. First end 76 of valve shaft 44 is configured to interface with drive 14 to receive the rotational driving input to rotational valve 18. In the example shown, valve connector 80 is formed in valve shaft 44 and is configured to receive a portion of drive 14 to connect to drive 14. Valve connector 80 is formed as a recess in first end 76 of valve shaft 44 in the example shown. For example, valve connector 80 can be formed as a keyed recess, a threaded recess, among other options for connecting with drive 14 to receive a rotational input. While valve connector 80 is shown as a recess, it is understood that in various other examples the valve connector 80 can be formed as a projection that extends to interface with a recess of the drive 14.In the example shown, the valve shaft 44 includes upper shaft 82 that extends to the first end 76. The valve connector 80 is formed in the upper shaft 82 in the example shown. Upper shaft 82 can interface with drive 14 to receive the rotational driving input to rotational valve 18 and can interface with bearing 32 to rotatably support valve shaft 44. Shoulder 84 is disposed at an inner end of upper shaft 82. Shoulder 84 projects radially outward from upper shaft 82. shoulder 84 can provider an interface for bearing 32. The bearing 32 can be braced against the shoulder 84. The shoulder 84 can be considered to provide a seat for the bearing 32. The bearing 32 can seat in the annular notch formed between upper shaft 82 and shoulder 84. In the example shown, shoulder 84 is two tiered and can interface with bearing 32 and with a support ring, through it is understood that in other examples the shoulder 84 can include a single tier.Lower shaft 86 extends axially from shoulder 84. Lower shaft 86 extends to second end 78 of valve shaft 44. Fluid pathways of rotational valve 18 are formed through lower shaft 86. In the example shown, no portion of any fluid pathway through valve shaft 44 extends into upper shaft 82. In the example shown, the lower shaft 86 includes multiple shaft portions 88 that reduce in diameter towards second end 78. Shaftsteps 102 are disposed between shaft portions 88 and provide the change in diameter between shaft portions 88. Shaft steps 102 can interface with bore shoulders 96 to axially locate rotational valve 18 within valve bore 20.Shaft portion 88a extends axially from shoulder 84. Shaft portion 88b extends axially from shaft portion 88a. Shaft portion 88c extends axially from shaft portion 88b. In the example shown, the diameter of shaft portion 88a is greater than the diameter of shaft portion 88b, and the diameter of shaft portion 88b is greater than the diameter of shaft portion 88c. The diameter of lower shaft 86 steps down from shoulder 84 and towards the second end 78. The diameter of lower shaft 86 reduces from a largest diameter portion of lower shaft 86, disposed furthest in axial direction ADI, to a smallest diameter portion of lower shaft 86, at second end 78.The varied diameter of valve shaft 44 assists in positioning rotational valve 18 within valve bore 20. The varied diameter of the valve shaft 44 interfaces with the varied diameter within the valve bore 20 to axially locate the valve shaft 44 within the valve bore 20. Such a configuration locates the valve shaft 44 to properly align fluid passages through rotational valve 18 with fluid passages within assembly body 12. Stepping down the diameter from the end of lower shaft 86 closest to first end 76 and towards second end 78 also allows for easy assembly and disassembly of rotational valve 18 from assembly body 12. The rotational valve 18 can be installed by shifting rotational valve 18 axially in axial direction AD2 into valve bore 20. The rotational valve 18 can be removed by shifting rotational valve 18 axially in axial direction ADI and out of valve bore 20. Such a configuration provides for quick and easy access for assembly and disassembly of multidisplacer assembly 10 for maintenance and / or replacement.In some examples, the valve connector 80 can be shaped to properly orient rotational valve 18 relative to drive 14 during assembly. For example, a keyed interface between valve shaft 44 and drive 14 can be configured for unidirectional connection, allowing connection in only a single orientation. Such a configuration properly positions the valve passages 50a, 50b relative to the feed passages 30a, 30b for efficient and proper fluid displacement by multi-displacer assembly 10. Such a keyed interface further facilitates quick and efficient assembly and disassembly as the user is not required to manually clock the rotational valve 18 and can instead simply rotate the rotational valve 18 and / or drive 14 until the keyed interface can be formed.In the example shown, each shaft portion 88 includes one or more openings formed through an exterior of that shaft portion 88 for receiving and / or outputting fluidfrom rotational valve 18. In the example shown, each shaft portion 88 includes one or more openings formed through a radial exterior of that shaft portion 88 for receiving and / or outputting fluid from rotational valve 18. Valve port 48a is formed through shaft portion 88a. In the example shown, the valve shaft 44a includes multiple of the valve ports 48a arrayed about the valve axis VA. Valve ports 48a are arrayed about the valve shaft 44. In the example shown, the multiple valve ports 48a are evenly arrayed about the valve axis VA. Valve ports 48a are configured to align with assembly passage 24a to be fluidly connected with assembly port 22a.Annular groove 60 is formed in valve shaft 44. Annular groove 60 is formed in shaft portion 88a. In the example shown, the valve ports 48a are open into the annular groove 60 such that the valve ports 48a are open through the radial exterior of valve shaft 44 through the annular groove 60. The annular groove 60 is configured to provide a flowpath for fluid to flow annularly about the rotational valve 18 and to the valve ports 48a. Such a configuration provides for even flow into or from valve passage 50a. While valve shaft 44 is shown as including annular groove 60, it is understood that not all examples are so limited. For example, in addition or alternatively to the annular groove 60, assembly body 12 can include an annular groove to provide annular flow about the valve ports 48a. Such an annular groove in the assembly body 12 can extend outward from the valve axis VA.Valve passage 50a is open through valve shaft 44. In the example shown, valve passage 50a is open through a radial exterior of valve shaft 44. Valve passage 50a widens circumferentially as valve passage 50a extends between shaft passage 64a and outer aperture 52a. Valve passage 50a extends partially circumferentially around valve axis VA in the example shown. In the example shown, valve passage 50a is fluidly connected to valve ports 48a regardless of the rotational position of valve shaft 44.Outer aperture 52a of valve passage 50a is formed through the exterior of valve shaft 44. Outer aperture 52a is formed through shaft portion 88b. Fluid flowing through valve flowpath 46a is configured to exit from or enter into valve shaft 44 through valve passage 50a. In the example shown, the outer aperture 52a of valve passage 50a extends at least partially around the valve axis VA. Outer aperture 52a is arced partially circumferentially around the valve shaft 44. The outer aperture 52a is larger circumferentially than axially in the example shown. Outer aperture 52a is configured to overlap with multiple feed passages 30a simultaneously to fluidly connect valve flowpath 46a with the multiple feed passages 30a.Valve passage 50b is open through valve shaft 44. In the example shown, valve passage 50b is open through a radial exterior of valve shaft 44. Valve passage 50b widens circumferentially as valve passage 50b extends between shaft passage 64a and outer aperture 52b. Valve passage 50b extends partially circumferentially around valve axis VA in the example shown. In the example shown, valve passage 50b is fluidly connected to valve port 48b regardless of the rotational position of valve shaft 44.Outer aperture 52b of valve passage 50b is formed through the exterior of valve shaft 44. Outer aperture 52b is formed through shaft portion 88c. Fluid flowing through valve flowpath 46b is configured to enter into or exit from valve shaft 44 through valve passage 50b. In the example shown, the outer aperture 52b of valve passage 50b extends at least partially around the valve axis VA. Outer aperture 52b is arced partially circumferentially around the valve shaft 44. The outer aperture 52b is larger circumferentially than axially in the example shown. Outer aperture 52b is configured to overlap with multiple feed passages 30b simultaneously to fluidly connect valve flowpath 46a with the multiple feed passages 30b.Valve passage 50a and valve passage 50b are configured to maintain fluid isolation between assembly passage 24a and assembly passage 24b throughout operation. The valve passages 50a, 50b extend through the exterior of valve shaft 44 at different circumferential locations about the valve shaft 44. Valve passage 50a and valve passage 50b are circumferentially offset from each other. In some examples, valve passage 50a and valve passage 50b do not axially overlap with each other. The outer aperture 52a and the outer aperture 52b are spaced circumferentially from each other such that the outer aperture 52a and the outer aperture 52b do not axially overlap with each other. The outer apertures 52a, 52b are disposed at different circumferential locations about valve axis VA. In some examples, the outer apertures 52a, 52b are configured such that no portion of either outer aperture 52a, 52b is simultaneously oriented in the same radial direction.Valve port 48b extends through valve shaft 44. Valve port 48 is open through the exterior of valve shaft 44. In the example shown, valve port 48b is formed through second end 78 of valve shaft 44. Valve port 48b is fluidly connected to assembly passage 24b and assembly port 22b throughout rotation of the rotational valve 18. The valve port 48b is configured to receive fluid into or output fluid from valve flowpath 46b. Valve port 48b is oriented axially to output or receive fluid flowing axially along valve axis VA. In the example shown, valve shaft 44 includes a single valve port 48b. It isunderstood, however, that not all examples are so limited. For example, valve port 48b can include a plurality of ports oriented radially, similar to valve ports 48a.Valve shaft 44 includes seal portions 90a, 90b that are configured to respectively radially overlap with feed ports 28a, 28b of feed passages 30a, 30b to fluidly disconnect the feed passages 30a, 30b from the valve flowpaths 46a, 46b. Seal portion 90a extends circumferentially around valve shaft 44 between the circumferential sides 92a of the outer aperture 52a. Seal portion 90a directly overlaps with a feed passage 30a to close the feed passage 30a. Seal portion 90a fully overlaps with a feed passage 30a to fluidly disconnect the feed passage 30a from the valve flowpath 46a. Seal portion 90b extends circumferentially around valve shaft 44 between the circumferential sides 92b of the outer aperture 52b. Seal portion 90b directly overlaps with a feed passage 30b to close the feed passage 30b. Seal portion 90b fully overlaps with a feed passage 30b to fluidly disconnect the feed passage 30b from the valve flowpath 46b. Seal portion 90a is spaced axially from seal portion 90b.Gap 100 is disposed circumferentially between the circumferentially closest edges of valve passages 50a, 50b. Gap 100 includes portions of the seal portions 90a, 90b that are disposed at the same circumferential locations about valve axis VA while being spaced axially from each other. The gap 100 is disposed circumferentially between the circumferentially closest edges of the outer apertures 52a, 52b. In the example shown, the valve shaft 44 includes a pair of gaps 100 disposed on opposite sides of the valve shaft 44. The gaps 100 can be disposed 180-degrees apart on valve shaft 44.Gap 100 maintains fluid isolation between the inlet and outlet flows from the multi-displacer assembly 10. Gap 100 is formed such that feed passages 30a, 30b of a single pump bore 26 are fluidly isolated from one of valve passages 50a, 50b before being fluidly connected to the other one of valve passages 50a, 50b. Gap 100 is sized such that rotational valve 18 fluidly disconnects the pump bore 26 from one of the inflow and outflow before fluidly connecting the pump bore 26 to the other one of the inflow and outflow. Such a configuration fluidly isolates the assembly passages 24a, 24b, thereby fluidly separating the inflow and outflow to each pump 16. The gap 100 is sized such that the gap 100 has a larger circumferential width than the width of the feed ports 28a, 28b. As such, the feed passages 30a, 30b of a single pump 16 are fluidly isolated from both the inflow and outflow during at least a portion of the rotation of the valve shaft 44.Rotational valve 18 provides significant advantages. Rotational valve 18 provides active checking for an array of pumps 16 by controlling the fluid connection ofthe pumps 16 with the inlet and outlet of a multi-displacer assembly 10. Valve passages 50a, 50b extend partially about the valve axis VA. The valve passages 50a, 50b sequentially connect the multiple pumps 16 to receive the inflow and provide the outflow for the multi-displacer assembly 10. Such sequential connection can facilitate out of phase pumping, providing for a smooth output and reducing pulsation. Gap 100 is formed circumferentially between the valve passage 50a and valve passage 50b. Gap 100 is formed such that seal portion 90a closes the feed passage 30a of a pump 16 and seal portion 90b closes the feed passage 30b of that same pump 16. That pump 16 is thus fluidly disconnected from both the valve flowpaths 46a, 46b. The valve passages 50a, 50b can fluidly connect each of the remaining pumps 16 to either valve flowpath 46a or valve flowpath 46b. Such a configuration can provide for consistent output from multi-displacer assembly 10. Rotational valve 18 can rotate in either rotational direction RD1, RD2 and provide active checking for the multiple pumps 16.FIG. 7 is an isometric view of multi-displacer assembly 110. FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 7. FIG. 9 is a cross-sectional view taken along line 9-9 in FIG. 7. FIG. 10 is a cross-sectional view taken along line 10-10 in FIG. 7. FIGS. 7-10 are discussed together. Multi-displacer assembly 110 is substantially similar to multi-displacer assembly 10 (best seen in FIGS. 1-5M), except that multi-displacer assembly 110 includes pump valves 149a, 149b that are sequenced by valve shaft 144. Components of multi-displacer assembly 110 similar to or the same as components of multi-displacer assembly 10 are labeled with the same reference number except increased by “100” (e.g., drive 114 and drive 114).Multi-displacer assembly 1100 includes assembly body 112, drive 114, pumps 116, valve assembly 18, valve bore 120, assembly ports 122a, 22b, assembly passages 124a, 124b, flow chambers 125a, 125b, pump bores 126, feed passages 130a, 130b, bearings 132a, 132b, and valve shaft 144. Assembly body 112 includes housing 145 and end caps 147a, 147b. Drive 114 includes driveshaft 134, eccentric 136, and plate 138. Pumps 116 each include displacer 140, seal assembly 142, and pump valves 149a, 149b. Valve shaft 144 includes upper cam 151 and lower cam 153.Multi-displacer assembly 1 10 is configured to output a fluid for dispensing, such as dispensing on a substrate. For example, multi-displacer assembly 110 can be configured to dispense higher viscosity fluids (e.g., sealant, adhesive, foam, gasketing material, among other options). In some examples, the multi-displacer assembly 110 can be configured to produce sufficient outlet fluid pressure to create fluid atomization at anozzle outlet, thereby allowing the system to be used in airless spraying applications, such as disclosed in United States Patent No. 9,914,141 (‘ 141 Patent) and United States PreGrant Publication 2017 / 0165692, the disclosure of which is herein incorporated by reference in its entirety.Multi-displacer assembly 110 includes multiple pumps 116 that are operated out of phase with each other to provide for a smooth, even outflow form multi-displacer assembly 110. In the example shown, valve assembly 119 provides active checking while the multiple displacers 140 are driven out of phase relative to each other. Valve assembly 119 includes valve shaft 144 and pump valves 149a, 149b. The valve shaft 144 controls opening and closing of the pump valves 149a, 149b of the multiple pumps 116. The valve shaft 144 and pump valves 149a, 149b together form a valve assembly 119 that sequentially fluidly connects multiple of the pumps 116 to the inflow received through the assembly port 122a and simultaneously sequentially fluidly connects multiple of the pumps 116 to provide outflow through the assembly port 122b. While assembly port 122a is described as an inlet port and assembly port 122b is described as an outlet port, it is understood that multi-displacer assembly 110 can be configured to provide flow in either direction. In some cases, inflow can be provided through assembly port 122b and outflow can be provided through assembly port 122a.Multi-displacer assembly 110 may provide more exact amounts of fluid dispense (e.g., more exact doses) as compared to checking with balls or other discrete valve members disconnected from the motion of the fluid displacer. In the example shown, the displacers 140 and valve assembly 119 are driven by drive 114 such that the opening and closing of the flowpaths to and from the pumps 116 is tied to motion of the displacer 140 through a pump cycle. Actively checking the fluid flow with the valve assembly 119 can also provide for smoother fluid flow by eliminating vibration generated by a ball reseating to close flowpaths in assemblies including ball check valves. Active checking with valve assembly 119 further facilitates having a greater and / or odd number of displacers 140 that are driven out of phase relative to each other. Such a configuration allows for balancing of the changeover, at which point a displacer 140 switches from displacing in one direction to displacing in the other direction, which provides for smoother flow and reduces pulsation in the output from multi-displacer assembly 110.Assembly body 112 supports other components of multi-displacer assembly 110. In the example shown, pump bores 126 of the multiple pumps 116 are formed in theassembly body 112. As such, assembly body 112 can be considered to form a pump body for multiple, up to all, of the pumps 116.In the example shown, the flowpaths in assembly body 1 12 are at least partially defined by housing 145. In the example shown, the pump bores 126 of the multiple pumps 116 are formed in the housing 145. End caps 147a, 147b are connected to housing 145. In the example shown, end caps 147a, 147b are mounted to opposite ends of housing 145. End cap 147a is disposed at a first end of assembly housing 145. In the example shown, the displacers 140 extend through end cap 147 and into the pump bores 126. Valve shaft 144 also extends through end cap 147a to connect to drive 114. End cap 147b is disposed at a second end of housing 145. End caps 147a, 147b can support rotation of valve shaft 144. In the example shown, bearing 132a is supported by end cap 147a and bearing 132b is supported by end cap 147b.For each pump 116, the displacer 140 is at least partially disposed within the assembly body 112. The displacer 140 is elongate along a pump axis PA. The displacer 140 is configured to reciprocate along the pump axis PA of the pump 116 with which that displacer 140 is associated to pump the fluid. The displacer 140 is configured to move through multiple pump cycles to pump the fluid. A pump cycle includes a pressure stroke, in which the displacer 140 moves in direction AD2, and a fill stroke, in which displacer 140 moves in direction ADI. In the example shown, pumps 116 are configured such that fluid is filled into the pump chamber 194 during a fill stroke and fluid is output from pump chamber 194 during a pressure stroke. The fluid displacers 140 can be configured as pistons, plungers, diaphragms, or other type of fluid mover.The displacer 140 is connected to drive 114 to receive a reciprocating input from drive 114. In the example shown, the drive 114 is formed as a wobble drive through it is understood that other configurations are possible. The rotational input for the wobble drive (or similar drive, e.g., a cam) may be provided by various motors, such as described in Paragraph

[0050] of United States Patent Application Publication 2017 / 0165692, assigned to Graco Minnesota Inc., with the disclosure of U.S. Patent Application Publication 2017 / 0165692 incorporated by reference in its entirety. The drive 114 can be connected to an electric motor to receive a rotational input from the electric motor, among other motor types.The drive 114 is configured to displace the fluid displacers 140 of the pumps116 out of phase relative to each other. The drive 114 includes a driveshaft 134 that is configured to receive the rotational input from the motor. The drive 114 is configured toconvert that rotational input into reciprocating linear motion that is provided to fluid displacers 140 to displace fluid displacers 140 and cause pumping by the multi-displacer assembly 110. In the example shown, the drive 114 includes a plate 138 that is mounted on an eccentric 136. The eccentric 136 is formed monolithically with driveshaft 134 in the example shown. Rotation of the eccentric 136 causes the plate 138 to wobble to cause movement of the displacers 140. In some examples, drive 114 interfaces with displacers 140 such that drive 114 can exert force to move the displacer 140 through a pressure stroke in axial direction AD2 but can be disconnected from displacers 140 to not actively move the displacer 140 in direction ADI . In such an example, the pressure of the inflow to multidisplacer assembly 110 can move the displacer 140 through the fill stroke. The drive 114 can limit movement of the displacer 140 in axial direction ADI during the fill stroke, such as by plate 138 axially overlapping with the fluid displacer 140 along the pump axis PA of that displacer 140. In other examples, the drive 114 can be drivingly connected to the displacers 140 to mechanically move the displacer 140 in both axial directions ADI, AD2 and through both pressure and fill strokes. As such, the drive 114 can interface with the fluid displacer 140 throughout a pump cycle while being drivingly disconnected from the displacer 140 during a fill stroke.Valve assembly 119 is connected to drive 114 to receive a rotational input from drive 114. In the example shown, valve shaft 144 is connected to drive 114 to receive rotational driving input from drive 114. The drive 114 is configured to rotatably drive valve shaft 144 on drive axis DA. Valve shaft 144 is configured to rotate on valve axis VA. The valve axis VA is disposed coaxially with drive axis DA in the example shown.Drive 114 interfaces with valve shaft 144 at a rotation lock that inhibits relative rotation between drive 114 and valve shaft 144. In some examples, drive 114 and valve shaft 144 are connected by a keyed interface that inhibits relative rotation. Such a keyed interface can allow drive 114 to transmit rotation to drive valve shaft 144 in either rotational direction RD1 or RD2. As such, the configuration of the assembly ports 122a, 22b can be reversed such that flow is received through assembly port 122b and output through assembly port 122a. In the example shown, a projection of the driveshaft 134 is received within a bore of valve shaft 144 to form the keyed interface, through it is understood that in various other examples a portion of valve shaft 144 can be received in a bore of the driveshaft 134, among other connection options.In the example shown, the drive 114 is configured to both convert rotational motion to linear motion, to cause pumping by pumps 116, and to transmit the rotationalmotion to provide a rotational output to valve assembly 119, to cause checking of fluid flow through pumps 116. As such, the drive 114 can provide both a linear input to displacers 140 to cause pumping by the multiple pumps 116 and a rotation input to valve assembly 119 to cause active checking of the fluid flow into and out of the multiple pumps 116.Bearings 132a, 132b support rotation and alignment of valve shaft 144. Bearing 132a is disposed within assembly body 112. Bearing 132b is disposed in assembly body 112. In the example shown, bearing 132a is formed as a ball bearing assembly, through it is understood that other configurations are possible. Tn the example shown, bearing 132b is formed as a roller bearing, through it is understood that other configurations are possible. Bearing 132a is disposed axially between the drive 114 and the fluid pathways through assembly body 112. In the example shown, bearing 132a is supported by end cap 147a and bearing 132b is supported by end cap 147b.Bearings 132a, 132b support rotation of valve shaft 144 on valve axis VA. Upper cam 151 and lower cam 153 of valve shaft 144 guide displacement of the valve seals 201 of pump valves 149a, 149b. The valve seals 201 interface with and, in some examples, can ride on the upper cam 151 and the lower cam 153. The upper cam 151 and lower cam 153 are disposed axially between bearing 132a and bearing 132b. Bearings 132a, 132b together align valve shaft 144 on the valve axis VA and assist in maintaining concentricity between valve shaft 144 and drive 114. Maintaining concentricity prevents off-axis forces that can cause wear and other damage to components.Lubricant chamber 157 is formed within assembly body 112. Valve shaft 144 is at least partially disposed within lubricant chamber 157. Lubricant chamber 157 can be filled with a lubricant, such as oil or grease. The mechanical interfaces between valve shaft 144 and pump valves 149a, 149b can be disposed within the lubricant chamber 157 to be lubricated by the lubricant in lubricant chamber 157. In the example shown, lubricant inlet 159 is formed through end cap 147b. Lubricant can be introduced to lubricant chamber 157 through lubricant inlet 159. In the example shown, a grease zerk is mounted to lubricant inlet 159 to facilitate input of grease into lubricant chamber 157. However, as noted above, lubricant chamber 157 can be configured to contain oil. For example, multidisplacer assembly 1 10 can include a circulating oil bath.Assembly port 122a is formed in assembly body 112. Assembly port 122a is formed through a lateral side 154 of assembly body 112. In the example shown, the assembly body 112 includes a flat lateral side 154a through which the assembly port 122a is formed. The assembly body 112 also includes a curved lateral side 154b. Assembly port122b is formed in assembly body 112. Assembly port 122b is formed through a lateral side 154 of assembly body 112. Assembly port 122b is formed through the flat lateral side 154a. In the example shown, the assembly port 122a and the assembly port 122b are stacked on the flat lateral side 154a. The assembly ports 122a, 22b axially overlap relative to the drive axis DA. The assembly ports 122a, 22b axially overlap relative to the valve axis VA. Having assembly port 122a and assembly port 122b through the same lateral side 154 of assembly body 112 facilitates easy and quick access to both ports, reducing downtime to access such ports and providing for easier and more efficient servicing. Forming assembly ports 122a, 22b through flat lateral side 154a provides easy access for a user to connect lines to assembly ports 122a, 22b.Flow chambers 125a, 125b are disposed within assembly body 112. Assembly passage 124a extends between and fluidly connects flow chamber 125a and assembly port 122a. Flow chamber 125 a is fluidly connected to assembly port 122a throughout operation. Assembly passage 124b extends between and fluidly connects flow chamber 125b and assembly port 122b. Flow chamber 125b is fluidly connected to assembly port 122b throughout operation. In the example shown, flow chambers 125a, 125b are formed as annular chambers. Flow chambers 125a, 125b extend fully annularly about the valve axis VA. Flow chambers 125a, 125b extend fully annularly about the drive axis DA.For purposes of discussion, multi-displacer assembly 110 will be considered to receive an inflow through the assembly port 122a and to output an outflow through assembly port 122b. As discussed above, however, multi-displacer assembly 110 can be operated to receive an inflow through assembly port 122b and to output an outflow through assembly port 122a.Valve bore 120 is formed in assembly body 1 12. Valve bore 120 is open through a top side 155 of assembly body 112. Valve bore 120 is fluidly isolated from the material flowpaths through assembly body 112 in the example shown. In the example shown, the valve shaft 144 regulates fluid flow by active control of the pump valves 149a, 149b of each pump 116 but valve shaft 144 is fluidly isolated from that fluid flow. The valve shaft 144 does not contact the material being pumped through assembly body 112.Assembly passage 124a extends between assembly port 122a and flow chamber 125a. Assembly passage 124a fluidly connects assembly port 122a and flow chamber 125a. Assembly passage 124b extends between assembly port 122b and flowchamber 125b. Assembly passage 124b fluidly connects flow chamber 125b and assembly port 122b.Feed passages 130a are disposed between flow chamber 125a and the pump bores 126. Feed passages 130b are disposed between flow chamber 125b and pump bores 126. In the example shown, each pump bore 26 is associated with a separate feed passage 130a and a separate feed passage 130b. Each feed passage 130a is configured to provide (or receive if flow is reversed) fluid to a single pump bore 26. Each feed passage 130b is configured to receive (or provide if flow is reversed) fluid to a single pump bore 26. Feed passages 130a, 130b are formed in assembly body 112.Feed passages 130a, 130b are disposed radially outward from valve axis VA in the example shown. The full length of each feed passages 130a, 130b is disposed between the valve axis VA and the pump axis PA of an associated pump 116, in the example shown. The feed passages 130a, 130b are disposed in a spoked configuration and radiate outward from valve axis VA in the example shown. In the example shown, each feed passage 130a, 130b extends both axially and radially relative to the valve axis VA.Feed passages 130b are disposed similar to feed passages 130a. Feed passages 130b can be stacked with feed passages 130a. Feed passages 130b can be aligned with feed passages 130a such that feed passages 130b axially overlap with the feed passages 130a relative to the valve axis VA.Feed passages 130a, 130b are evenly arrayed about valve axis VA in the example shown. The pump bores 126 are evenly arrayed about valve axis VA. In the example shown, the pump bores 126 are disposed 60-degrees apart from each other about the valve axis VA for the five pump bores 126. It is understood that the pump bores 126 can be disposed closer together or further apart depending on the number of pump bores 126. Evenly arraying the pump bores 126 circumferentially about the valve axis VA facilitates out of phase and sequenced pumping by the pumps 116 to provide even flow and reduce pulsation in the outflow.Valve assembly 119 is configured to actively check fluid flow into and out of each of the pumps 116 of multi-displacer assembly 110. Valve shaft 144 is configured to regulate actuation of the pump valves 149a, 149b to control flow into and out of each pump 116 of multi-displacer assembly 110. Valve assembly 119 actively checks the fluid flow such that the opening and closing of flowpaths to and from the pump chambers 194 are tied with the position and movement of the displacers 140 of the pumps 116. The valve assembly 119 times the opening and closing of the pump valves 149a, 149b to regulate flowthrough multi-displacer assembly 110. Valve assembly 119 is configured to intermittently and sequentially fluidly connect the assembly passage 124a with the pump bores 126 and intermittently and sequentially fluidly connect the pump bores 126 with the assembly passage 124b. The valve assembly 119 can, in some examples, sequence the pumps 116 such that a plurality of the pumps 116 are fluidly connected to assembly port 122a to receive inflow of fluid and another plurality of the pumps 116 are fluidly connected to assembly port 122b to provide an outflow of fluid.Each pump 116 includes a pump valve 149a and a pump valve 149b. In the example shown, the pump valves 149a, 149b are configured the same as each other, though it is understood that not all examples are so limited. Each pump valve 149a, 149b includes valve seat 203 and valve seal 201. Valve seal 201 includes seal head 204 and seal stem 206. In the examples discussed, pump valve 149a forms an inlet valve and pump valve 149b forms an outlet valve, though it is understood that the configuration can be reversed in examples in which flow is provided through assembly port 122b and output through assembly port 122a.Valve shaft 144 is at least partially disposed in valve bore 120. Valve shaft 144 is connected to drive 114 to be rotatably driven by drive 114. The valve shaft 144 can, in some examples, project out of valve bore 120. Valve shaft 144 is configured to rotate on valve axis VA and actively check fluid flow into and out of pump bores 126 via pump valves 149a, 149b.Valve shaft 144 includes upper cam 151 and lower cam 153. Upper cam 151 and lower cam 153 are spaced axially from each other along valve axis VA. Upper cam 151 is formed as a cam in the example shown and can be referred to as an upper cam. Upper cam 151 is configured to interact with pump valves 149a to control actuation of pump valves 149a. Lower cam 153 is formed as a cam in the example shown and can be referred to as a lower cam. Lower cam 153 is configured to interact with pump valves 149b to control actuation of pump valves 149b. As valve shaft 144 rotates, the valve seals 201 ride on valve shaft 144, specifically on one or the other of upper cam 151 and lower cam 153. The upper cam 151 and lower cam 153 are configured such that the exterior surface (e.g., the outer radial surface relative to valve axis VA) varies in distance from the valve axis VA. The valve seals 201 of the pump valves 149a, 149b ride on one or the other of the upper cam 151 and the lower cam 153 and the varied radial widths of the upper cam 151 and lower cam 153 cause translation of the valve seals 201. Rotation of valve shaft144 is configured to cause and / or guide reciprocation of valve seals 201 to actuate the pump valves 149a, 149b open and / or closed.Pump valve 149a is disposed fluidly between flow chamber 125 a and pump chamber 194. Pump valve 149a is configured to regulate fluid flow between flow chamber 125a and a respective pump chamber 194 associated with that pump valve 149a. In the example shown, pump valve 149a forms an inlet valve for its associated pump 116, though it is understood that pump valve 149a can form an outlet valve in examples in which flow is reversed.Pump valve 149b is disposed fluidly between flow chamber 125b and pump chamber 194. Pump valve 149b is configured to regulate fluid flow between flow chamber 125b and a respective pump chamber 194 associated with that pump valve 149b. In the example shown, pump valve 149b forms an outlet valve for its associated pump 116, though it is understood that pump valve 149b can form an inlet valve in examples in which flow is reversed.In the example shown, each pump valve 149a, 149b is supported by a valve cartridge 208. The valve cartridge 208 is mounted to assembly body 112. The valve cartridges 208 are disposed in check bores 210a, 210b in the assembly body 112. The check bores 210a, 210b extend through and across the pump bores 126. The valve cartridge 208 disposed in check bore 210a regulates fluid flow between flow chamber 125a and pump bore 126 and the valve cartridge 208 disposed in check bore 210b regulates fluid flow between flow chamber 125 b and pump bore 126.In the example shown, the valve cartridge 208 includes cartridge port 212 and cross-bore 214. The cartridge port 212 is aligned with a feed passage 130a, 130b to fluidly connect with a flow chamber 125a, 125b. The cross-bore 214 is aligned on the pump axis PA and can at least partially define the pump chamber 194. The displacer 140 moves within the cross-bore 214 during at least a portion of each pump cycle. During at least some portions of a pump cycle the displacer 140 extends into or through both crossbores 214 of the valve cartridges 208.In the example shown, the valve cartridges 208 are clamped within assembly body 112. Pump plate 216 overlaps with valve cartridges 208 and retains valve cartridges 208 within assembly body 112. In the example shown, the valve cartridges 208 are not directly connected to assembly body 112 but are instead retained within assembly body 112 by pump plate 216. The valve cartridges 208 do not include threading or other structure todirectly connect with assembly body 112. Such a configuration avoids wetted connecting interfaces, which can gum or otherwise stick due to fluid entering into such connections.Valve cartridges 208 can interface with the assembly body 112 at a keyed interface. Such a keyed interface provides alignment between the cartridge port 212 and a feed passage 130a, 130b. The keyed interface is formed between a projection 218 and a notch 220. In the example shown, the projection 218 is formed on the valve cartridge 208 and the notch 220 is formed in assembly body 112, though it is understood that not all examples are so limited. The positions of the notches 220 associated with check bore 210a and check bore 210b can be reversed (e.g., disposed 180-degrees apart about the check bore 210a, 210b). Such a configuration facilitates utilizing the same part forming a valve cartridge 208 in either check bore 210a, 210b as the keyed interface will align the cartridge port 212 with the feed passage 130a, 130b.Valve seal 201 is configured to interface with valve seat 203 to place a pump valve 149 in a closed state and the valve seal 201 is spaced from valve seat 203 to place a pump valve 149 in an open state. Valve seal 201 is configured to translate along a seal axis SA during operation. The seal axis SA can be disposed orthogonal to the pump axis PA. The seal axis SA can be disposed orthogonal to the rotational axis RA of the valve shaft 144. The seal axis SA can be disposed orthogonal to the pump axis PA along which the displacer 140 reciprocates. Valve seat 203 is formed as an annular seat. In the example shown, each pump valve 149a, 149b is formed as a poppet valve. It is understood, however, that not all examples are so limited.The valve seal 201 is configured to reciprocate on the seal axis SA to open and close the pump valve 149. In the example shown, the valve seal 201 is configured to move into the valve seat 203 to radially overlap with the valve seat 203 and sealingly interface with the valve seat 203. In the example shown, the valve seal 201 is configured to move out of the valve seat 203 to no longer radially overlap with the valve seat 203 to open a flowpath through the pump valve 149.It is understood that valve seal 201 can sealingly interface with valve seat 203 without the valve seal 201 physically contacting the valve seat 203. For example, the valve seal 201 and valve seat 203 can be sized such that a circumferential gap between valve seal 201 and valve seat 203 is small enough to inhibit fluid flow between valve seal 201 and valve seat 203. It is understood that, in various examples, the valve seal 201 can physically contact the valve seat 203 to place the pump valve 149a, 149b in a closed state.Valve seal 201 is partially exposed to the material being displaced by multidisplacer assembly 110. Valve seal 201 projects out of the fluid flowpath and into valve bore 120 in the example shown. The valve seal 201 extends into the valve bore 120 to interface with valve shaft 144. Valve seal 201 is configured to shift in axial direction VD1 along seal axis SA to move from a position associated with an open state of pump valve 149 to a position associated with a closed state of pump valve 149. Valve seal 201 is configured to shift in the opposite axial direction VD2 along seal axis SA to move from a position associated with the closed state of pump valve 149 to a position associated with the open state of pump valve 149.In the example shown, the valve seal 201 extends through a check seal assembly 222 to interface with the valve shaft 144. The check seal assembly 222 provides a dynamic sealing interface with valve seal 201 . The check seal assembly 222 provides a fluid seal between lubricant chamber 157 and the fluid flowpaths through assembly body 112. In the example shown, seal stem 206 interfaces with check seal assembly 222. Valve seal 201 reciprocates relative to check seal assembly 222 during operation. The fluid seal between valve seal 201 and check seal assembly 222 prevents fluid flow between the process fluid pathways (e.g., flowpaths between assembly port 122a and assembly port 122b) and the lubricant chamber 157. Check seal assembly 222 can be of any desired configuration for forming a fluid seal with valve seal 201. For examine, check seal assembly 222 can include one or more elastomeric seals (e.g., o-ring, u-cup, etc.) interfacing with and sealing with valve seal 201. Check seal assembly 222 is disposed between a pressure chamber 228 of a pump valve 149a, 149b and the valve shaft 144. The pressure chamber 228 is fluidly connected to an upstream flow (e.g., for pump valves 149a) or a downstream flow (e.g., for pump valves 149b) throughout operation. The pressure chamber 228 is intermittently fluidly connected to the pump chamber 194 to provide inflow or receive outflow. The pump valves 149a, 149b are configured to control flow between the pressure chamber 228 and the pump chamber 194. In the example shown, the pressure chamber 228 is disposed within and defined by the valve cartridge 208. It is understood, however, that not all examples are so limited. For example, the pressure chamber 228 can be defined by the assembly body 112 in examples not including a valve cartridge 208.The pressure chamber 228 can be pressurized by the pumped fluid throughout operation. As discussed above, the inflow to multi-displacer assembly 110 can be pressurized such that all flowpaths upstream of a pump chamber 194 are pressurized. Further, the multiple pumps 116 output to a common chamber (e.g., flow chamber 125b)which is fluidly connected to the pressure chamber 228 of each pump valve 149b throughout operation such that those pressure chambers 228 are pressurized by outflow of fluid throughout operation.In the example shown, the valve seal 201 includes seal head 204 that is configured to interface with and separate from the valve seat 203 to close and open the pump valve 149a, 149b, respectively. Seal stem 206 is connected to seal head 204. Seal stem 206 extends from seal head 204 and is configured to interface with valve shaft 144. Seal stem 206 projects in axial direction VD2 from seal head 204 and towards valve shaft 144. In the example shown, seal head 204 and seal stem 206 are formed separately and assembled together, such as by press-fitting among other options. It is understood, however, that in various other examples valve seal 201 can be formed monolithically or by more than two components.In the example shown, valve seal 201 is structurally supported by valve bearing 224. Valve bearing 224 extends annularly around valve seal 201. In the example shown, seal stem 206 extends through and interfaces with valve bearing 224. Valve bearing 224 can be formed as a bushing, among other options. Valve seal 201 is slidable relative to valve bearing 224 along the seal axis SA. Valve bearing 224 supports translation of valve seal 201 along seal axis SA and is configured to maintain valve seal 201 concentric with valve seat 203 on seal axis SA.Seal head 204 extends in axial direction VD1 from seal stem 206. Seal head 204 is configured to interface with valve seat 203 with pump valve 149a, 149b in the closed state. As discussed above, seal head 204 can, in some examples, sealingly interface with valve seat 203 without physically contacting valve seat 203. In some examples, both valve seat 203 and seal stem 206 are formed from hardened material, such as metal, such as carbide, to provide a resilient sealing interface.In the example shown, valve seal 201 includes multiple different diameter portions. Seal head 204 has a head diameter SD1 and seal stem 206 has stem diameter SD2. The stem diameter SD2 is larger than the head diameter SD1. Check shoulder 226 extends radially between the first diameter portion of valve seal 201 and the second diameter portion of valve seal 201. Check shoulder 226 extends radially outward from seal head 204 in the example shown. Check shoulder 226 increases the diameter of valve seal 201 between the radial exterior of seal head 204 and the radial exterior of seal stem 206.In some examples, the pump valves 149a, 149b are configured such that the valve seal 201 is mechanically displaced through a closing stroke (i.e., in axial directionVD1 from open to closed) and is not mechanically displaced through an opening stroke (i.e., in axial direction VD2 from closed to open). In the example shown, the pump valves 149a, 149b do not include springs or other actuators for displacing the valve seals 201 through an opening stroke. In some examples, pump valves 149a, 149b are configured to be fluidically opened and mechanically closed. It is understood that the valve seal 201 can be mechanically guided through an opening stroke (e.g., by riding on valve shaft 144) while being fluidically driven through the opening stroke (e.g., by fluid pressure).The fluid pressure in multi-displacer assembly 1 10 is configured to act on valve seals 201 to bias the valve seals 201 in axial direction VD2 and towards the open state. The fluid pressure biases the valve seals 201 towards the valve shaft 144 and valve axis VA. The fluid pressure can bias the valve seals 201 towards the valve shaft 144 to cause the valve seals 201 to ride on the valve shaft 144 during rotation of the valve shaft 144.In the example shown, valve seals 201 include multiple different diameters. The pump valve 149a is configured to transition from a closed state to an open state to allow inflow of fluid into pump chamber 194 as the displacer 140 moves through a fill stroke. As discussed above, the inflow to assembly housing 145 can be pressurized. The pressurized inflow pressurizes the flow chamber 125a, feed passages 130a, and pressure chambers 228 of pump valves 149a. The fluid pressure acts on the check shoulder 226 and exerts driving force in axial direction VD2. That fluid pressure acting on valve seal 201 biases valve seal 201 in axial direction VD2. Such biasing force causes the valve seal 201 to ride on valve shaft 144. Rotation of the upper cam 151 allows the valve seal 201 to shift to an open state and further rotation of the upper cam 151 mechanically displaces the valve seal 201 to the closed state. Rotation of the valve shaft 144 thereby guides reciprocation of the valve seal 201 of pump valve 149a through the opening and closing strokes as valve seal 201 rides on upper cam 151.The pump valve 149b is configured to transition from a closed state to an open state to allow outflow of fluid from pump chamber 194 as the displacer 140 moves through a pressure stroke. The displacer 140 pressurizes the fluid in pump chamber 194. The fluid in pump chamber 194 acts on the valve seal 201 of pump valve 149b and biases that valve seal 201 in axial direction VD2. Such biasing force causes the valve seal 201 to ride on valve shaft 144. Rotation of the lower cam 153 allows the valve seal 201 to shift to an open state and further rotation of the lower cam 153 mechanically displaces the valve seal 201 to the closed state. Rotation of the valve shaft 144 thereby guides reciprocationof the valve seal 201 of pump valve 149b through the opening and closing strokes as valve seal 201 rides on upper cam 151.The outflow from pumps 116 pressurizes flow chamber 125b, feed passages 130b, and the pressure chambers 228 of pump valves 149b. The pressurized flow downstream of the pump chamber 194 (e.g., in the pressure chamber 228 associated with a pump valve 149b) can act on a radially enlarged portion of the valve seal 201 to bias the valve seal 201 in axial direction VD2. In the example shown, the downstream pressurized fluid can act on check shoulder 226 to bias the valve seal 201 of pump valve 149b in axial direction VD2. The pressurized downstream fluid acting on valve seal 201 can facilitate valve seal 201 beginning to move through an opening stroke prior to the displacer 140 beginning a pressure stroke, providing for quicker outflow from pump 116.While pump valves 149a, 149b are discussed as being fluidically opened and mechanically closed, it is understood that not all examples are so limited. For example, valve seals 201 can, in some examples, be mechanically displaced through both closing and opening strokes. For example, pump valves 149a, 149b can include one or more springs for displacing the valve seals 201 to respective open states; the valve seals 201 can be connected to valve shaft 144 to be driven through both opening and closing strokes by the valve shaft 144; among other options.Valve assembly 119 is configured to simultaneously fluidly connect multiple of the pump bores 126 to assembly passage 124a while simultaneously fluidly disconnecting multiple of the pump bores 126 of others of the pumps 116 from the assembly passage 124a. The valve assembly 119 simultaneously fluidly connects multiple of the pump bores 126 to the assembly passage 124b while fluidly disconnecting multiple of the pump bores 126 of others of the pumps 116 from the assembly passage 124b. The valve assembly 119 is configured such that the flow through assembly passage 124a and flow chamber 125a is fluidly isolated from the flow through assembly passage 124b and flow chamber 125b throughout operation. In such an example, valve assembly 119 can fluidly connect multiple pumps 116 to the assembly passage 124a, fluidly connect multiple other pumps 116 to the assembly passage 124b, and further fluidly disconnect one or more additional pumps 116 from both the assembly passages 124a, 124b.Pumps 116 are arrayed circumferentially about the valve axis VA. The pump bores 126 are disposed radially outward from valve axis VA. In the example shown, the pump bores 126 are evenly arrayed about valve axis VA and evenly spaced from valveaxis VA. The pump bores 126 circumferentially overlap with each other about the valve axis VA in the example shown.For each pump 116, the fluid displacer 140 is at least partially disposed in the pump bore 26. The fluid displacer 140 projects out of the pump bore 126 through seal assembly 142. The fluid displacer 140 interfaces with drive 114 to receive a driving input from drive 114. The fluid displacers 140 are each configured to reciprocate on a pump axis PA to pump the fluid. The pump axes PA of the multiple pumps 116 are disposed parallel to and are radially offset from valve axis VA in the example shown. The fluid displacers 140 can be formed as pistons, plungers, diaphragms, among other options. The fluid displacers 140 are arrayed about the valve axis VA. The fluid displacers 140 are evenly arrayed about the valve axis VA in this example.In the example shown, the drive 114 is configured to directly drive the fluid displacers 140 through a pressure stroke and is configured to interface with the fluid displacers 140 and guide the fluid displacers 140 through a fill stroke. In the example shown, displacer caps 68 are configured to interface with drive 114 and interface with the fluid displacer 140. For example, the displacer cap 168 can at least partially receive a head 170 of the fluid displacer 140. The displacer cap 168 can be configured to pivot on the head 170 such that the displacer cap 168 maintains a desired contact orientation relative to the head 170 and the plate 138. Such a configuration can assist in maintaining concentricity of the fluid displacer 140 on the pump axis PA, preventing wear and increasing operable life. The displacer cap 168 interfaces with the plate 138 of the drive 114. The plate 138 pushing downward in axial direction AD2 drives the displacer cap 168 and fluid displacer 140 downward in axial direction AD2 and through a pressure stroke.In some examples, the displacer cap 168 is mechanically disconnected from the plate 138 such that the plate 138 does not exert a driving force in axial direction ADI. In such an example, the displacer cap 168 can be configured to slide on plate 138, further assisting in maintaining concentricity. The feed pressure of the fluid provided to pump chamber 194 can drive the fluid displacer 140 in axial direction ADI, maintaining the interface between plate 138 and fluid displacer 140. Plate 138 can limit movement of fluid displacer 140 in axial direction ADI, maintaining a desired displacement rate and fill rate into the pump chamber 194. Displacer cap 168 being disconnected from plate 138 prevents plate 138 from exerting side loading on fluid displacers 140, assisting in maintaining concentricity of the fluid displacer 140 on the pump axis PA. Maintaining concentricityinhibits wear on fluid displacer 140 and provides for efficient pumping, decreased costs, and reduced downtime.In the example shown, fluid displacer 140 extends through seal assembly 142. Seal assembly 142 prevents fluid from leaking out of pump bore 26 along fluid displacer 140. In the example shown, the seal assembly 142 includes displacer seal 172 and seal support 174. The displacer seal 172 engages with the assembly body 112 and fluid displacer 140 and seals against the assembly body 112 and fluid displacer 140. The displacer seal 172 can be configured as a u-cup seal among other options. In some examples, displacer seal 172 is configured to be energized by the fluid pressure within pump chamber 194. Displacer seal 172 provides a dynamic sealing interface between the moving fluid displacer 140 and the static assembly body 112. Seal support 174 can brace displacer seal 172 and hold displacer seal 172 in pump bore 26. Seal support 174 can include a cap and one or more spacers, among other options.FIG. 11 is an isometric view of valve shaft 144. Valve shaft 144 includes upper cam 151 and lower cam 153. Valve shaft 144 is configured to receive a rotational input from drive 114 and provide a linear driving output to the valve seals 201 of the pump valves 149a, 149b. The valve shaft 144 interfaces with the valve seals 201 of the multiple pumps 116 to sequence opening and closing of the inlet and outlet flowpaths for the pumps 116.Valve shaft 144 is configured to be at least partially disposed within valve bore 120. Valve shaft 144 is configured to rotate on valve axis VA to sequentially fluidly connect and disconnect pump chambers 194 with flow chambers 125a, 125b. First end 176 of valve shaft 144 is configured to interface with drive 114 to receive the rotational driving input. In the example shown, valve connector 180 is formed in valve shaft 144 and is configured to receive a portion of drive 114 to connect to drive 114. Valve connector 180 is formed as a recess in first end 176 of valve shaft 144 in the example shown. For example, valve connector 180 can be formed as a keyed recess, a threaded recess, among other options for connecting with drive 114 to receive a rotational input. While valve connector 180 is shown as a recess, it is understood that in various other examples the valve connector 180 can be formed as a projection that extends to interface with a recess of the drive 114.Valve shaft 144 extends between first end 176 and second end 178. Second end 178 is disposed at an opposite axial end of valve shaft 144 from first end 176. In the example shown, the second end 178 is configured to interface with bearing 132b. Bearing132b can support rotation of valve shaft 144 on valve axis VA and can assist in concentrically aligning valve shaft 144 on valve axis VA.Upper cam 151 and lower cam 153 are formed on valve shaft 144. Upper cam 151 and lower cam 153 are configured to interface with valve seals 201 to guide displacement of the valve seals 201 and thus actuation of the pump valves 149a, 149b.Upper cam 151 includes upper nose 230 and upper base 232. Upper nose 230 is a portion of upper cam 151 projecting furthest from valve axis VA. Upper base 232 is a portion of upper cam 151 closest to valve axis VA. Sides of the upper cam 151 extend between upper nose 230 and upper base 232. Upper base 232 is disposed on an opposite side of valve shaft 144 from upper nose 230. A valve seal 201 rides on upper cam 151 from upper base 232 to upper nose 230 to be displaced in a closing direction VD1. The valve seal 201 rides on upper cam 151 from upper nose 230 to upper base 232 to be displaced in the opening direction VD2.Lower cam 153 includes loser nose 234 and lower base 236. Loser nose 234 is a portion of lower cam 153 projecting furthest from valve axis VA. Lower base 236 is a portion of lower cam 153 closest to valve axis VA. Sides of the upper cam 151 extend between upper nose 230 and upper base 232. Lower base 236 is disposed on an opposite side of valve shaft 144 from loser nose 234. A valve seal 201 rides on lower cam 153 from lower base 236 to loser nose 234 to be displaced in a closing direction VD1. The valve seal 201 rides on lower cam 153 from loser nose 234 to lower base 236 to be displaced in the opening direction VD2.Upper cam 151 and lower cam 153 are disposed in opposing configurations. In the example shown, the upper nose 230 is oriented 180-degrees apart from the loser nose 234 about the valve axis VA. Disposing the upper cam 151 and lower cam 180-degrees out of phase facilitates sequential opening and closing of pump valves 149a, 149b to sequentially connect pumps 116 to the inflow through assembly port 122a and the outflow through assembly port 122b. It is understood, however, that other configurations are possible.FIGS. 12A-12L are enlarged cross-sectional views showing a portion of multi-displacer assembly 110. FIGS. 12A-12L are enlarged views of the portion shown in detail Z in FIG. 8 that show multi-displacer assembly 110 in various states of operation. FIGS. 12A-12L are discussed together and with continued reference to FIGS. 7-11. A single pump 116 is shown and discussed with regard to FIGS. 12A-12L. It is understood that each pump 116 can operate in the same manner as that discussed, but out of phase withrespect to each other. In the example discussed with regard to FIGS. 12A-12L, the drive 114 is driven in rotational direction RD1.In FIG. 12 A, the drive 114 is at a 0-degree rotational position and the fluid displacer 140 is at a bottom of a pressure stroke in axial direction AD2. Both of the pump valves 149a, 149b are closed.In FIG. 12B, the valve shaft 144 is rotated in rotational direction RD1 from the position in FIG. 12A. In this example, the valve shaft 144 is rotated 10-degrees from the position in FIG. 12A to the position in FIG. 12B. The pump valve 149a begins to open as the seal stem 206 of pump valve 149a rides on upper cam 151. V alve shaft 144 is rotating such that the seal stem 206 rides on a back side of upper cam 151 and moves closer towards the valve axis VA. The seal stem 206 of pump valve 149a is disengaging from the valve seat 203 of pump valve 149a to open pump valve 149a and fluidly connect the inlet flow through assembly port 122a and flow chamber 125 a with the pump bore 126. The seal stem 206 of pump valve 149b is being displaced in an opposite axial direction from the valve stem of pump valve 149a. The seal stem 206 of pump valve 149b is driven in axial direction VD1 and further away from valve axis VA while seal stem 206 of pump valve 149a moves in axial direction VD2 and closer towards valve axis VA. The seal stem 206 of pump valve 149b rides on a rising side of lower cam 153 and towards loser nose 234. The fluid can begin to flow through pump valve 149a and into the pump chamber 194 while pump valve 149b prevents outflow from pump chamber 194. The fluid displacer 140 can be going through changeover and / or beginning to displace through the fill stroke.As discussed above, one or both of pump valves 149a, 149b can be configured to be fluidically opened and mechanically closed. For example, the upstream fluid pressure in the pressure chamber 228 associated with pump valve 149a can act on valve seal 201 of pump valve 149a to bias that valve seal 201 in axial direction VD2. The valve seal 201 rides on valve shaft 144 and can retract from valve seat 203 of pump valve 149a to open the flowpath into the pump chamber 194.Pump valve 149b remains in a closed state. The valve seal 201 of pump valve 149b can be displaced further in axial direction VD1 to increase an overlap between valve seal 201 and valve seat 203 of pump valve 149b. The valve seal 201 of pump valve 149b rides on the lower cam 153 as valve shaft 144 rotates.In FIG. 12C, the valve shaft 144 is rotated to 45-degrees offset from the initial state shown in FIG. 12A. Pump valve 149a is open and pump valve 149b is closed. Valve seal 201 of pump valve 149a continues to displace in axial direction VD2, furtheropening the pump valve 149a. The fluid flows from flow chamber 125a, through the flow passage 130a, and through pump valve 149a into the pump chamber 194. The fluid displacer 140 displaces in axial direction ADI and through a fill stroke. The fluid flow into pump chamber 194 can be pressurized such that the fluid inflow displaces the fluid displacer 140 in axial direction ADI , though it is understood that in various other examples the displacer 140 can be connected to the drive 114 such that the drive 114 mechanically moves the displacer 140 through a fill stroke.In FIG. 12D, the valve shaft 144 is rotated to 90-degrees offset from the initial state shown in FIG. 12A. Pump valve 149a is open and pump valve 149b is closed. The valve seal 201 of pump valve 149a is fully displaced in the opening axial direction VD2 and the valve seal 201 of pump valve 149b is fully displaced in the closing axial direction VD1. Fluid continues to fill into pump chamber 194 as fluid displacer 140 displaces in axial direction ADI and through the fill stroke.In FIG. 12E the valve shaft 144 is rotated to 135-degrees offset from the initial state shown in FIG. 12 A. Fluid continues to fill into pump chamber 194 through the open pump valve 149a as fluid displacer 140 displaces in axial direction ADI and through the fill stroke.In FIG. 12F, the valve shaft 144 is rotated to 170-degrees offset from the initial state shown in FIG. 12A. The valve seal 201 of pump valve 149a is shifting in the closing axial direction VD1 and towards the closed state. In the state shown in FIG. 12F, the pump valve 149a is nearly closed and pump valve 149b is closed. Fluid can continue to fill into pump chamber 194 as fluid displacer 140 displaces in axial direction ADI and through the fill stroke. The pump valve 149a is closing and is partially open in FIG. 12F. The fluid displacer 140 can be decelerating into changeover with pump 116 in the state shown in FIG. 12F.In FIG. 12G, the valve shaft 144 is rotated to 180-degrees offset from the initial state shown in FIG. 12A. The valve seal 201 of pump valve 149a is sealingly interfaced with valve seat 203 and pump valve 149a is in a closed state. Pump valve 149b is also in a closed state. The valve seal 201 of pump valve 149b can be moving in the opening axial direction VD2, but pump valve 149b remains closed. The pump bore 126 is fluidly isolated from both flow chamber 125a and flow chamber 125b. With the pump 116 in the state shown in FIG. 12G, the pump chamber 194 is isolated from both the upstream pressure in flow chamber 125a and the downstream pressure in flow chamber 125b. The fluid displacer 140 is at an end of the fill stroke in axial direction ADI and is changing overfrom the fill stroke to a pressure stroke in axial direction AD2. The pump valve 149a is closing between the states shown in FIGS. 12E and 12G and is fully closed in FIG. 12G.In FIG. 12H, the valve shaft 144 is rotated to 190-degrees offset from the initial state shown in FIG. 12 A. Valve seal 201 of pump valve 149b moves in the opening axial direction AD2 as that valve seal 201b rides on lower cam 153. The valve seal 201 of pump valve 149b disengages from the valve seat 203 of pump valve 149b and pump valve 149b begins to open. The fluid can begin to flow from the pump 116, through pump valve 149b and feed passage 130b, and out of multi-displacer assembly 1 10 through assembly port 122b. The valve seal 201 of pump valve 149a is engaged with the valve seat 203 of pump valve 149a and maintains the pump valve 149a in a closed state. The valve seal 201 of pump valve 149a can, in some examples, continue to shift in the closing axial direction VD1 to increase an overlap between valve seal 201 and valve seat 203. The pump 116 remains fluidly disconnected from flow chamber 125a and assembly passage 124a. While the illustrated pump 116 is fluidly disconnected from the flow through assembly passage 124a, others of the pumps 116 rotationally ahead of pump 116 are fluidly connected to assembly passage 124a to fill.In FIG. 121, the valve shaft 144 is rotated to 225-degrees offset from the initial state shown in FIG. 12A. The valve seal 201 of pump valve 149b continues to displace in axial direction VD2, further opening the pump valve 149b. The fluid displacer 140 displaces in axial direction AD2 and through the pressure stroke. The fluid displacer 140 drives fluid from pump chamber 194 through pump valve 149b and feed passage 130b to flow chamber 125b. The fluid flows downstream from flow chamber 125b and out from multi-displacer assembly 110 through assembly port 122b. Pump valve 149a remains in a closed state.In FIG. 12J, the valve shaft 144 is rotated to 270-degrees offset from the initial state shown in FIG. 12 A. The valve seal 201 of pump valve 149b is fully displaced in the opening axial direction VD2 and the valve seal 201 of pump valve 149a is fully displaced in the closing axial direction VD1. Pump valve 149b is opened and pump valve 149a remains closed. Fluid continues to be driven out of pump chamber 194 as fluid displacer 140 displaces in axial direction AD2 and through the pressure stroke.In FIG. 12K, the valve shaft 144 is rotated to 315-degrees offset from the initial state shown in FIG. 12A. The pump valve 149b is open and fluid continues be driven out of pump chamber 194 as fluid displacer 140 displaces in axial direction AD2 and through the pressure stroke.In FIG. 12L, the rotational valve 18 is rotated to 350-degrees offset from the initial state shown in FIG. 12 A. The valve seal 201 of pump valve 149b is shifting in the closing axial direction VD 1 and towards the closed state. In the state shown, the pump valve 149b is nearly closed. Fluid can continue to be driven out of pump chamber 194 as fluid displacer 140 displaces in axial direction AD2 and through the pressure stroke.The valve shaft 144 then completes a full 360-degree rotation and returns to the state shown in FIG. I2A. The valve seal 201 of pump valve 149b is sealingly interfaced with valve seat 203 such that pump valve 149b is in a closed state. Pump valve 149a is also in a closed state. The valve seal 201 of pump valve 149a can be moving in the opening axial direction VD2 but remains closed. The pump chamber 194 is fluidly isolated from both flow chamber 125a and flow chamber 125b. With the pump 116 in the state shown in FIG. 12A, the pump chamber 194 is isolated from both the upstream pressure in flow chamber 125a and the downstream pressure in flow chamber 125b. The fluid displacer 140 is at an end of the pressure stroke in axial direction AD2 and is changing over from the pressure stroke to a fill stroke in axial direction ADI. The pump valve 149b is closing between the states shown in FIGS. 12K and 12A and is fully closed in FIG. 12A. The drive 114 continues to rotate in rotational direction RD1 and multi-displacer assembly 110 continues through the states in FIGS. 12A-12L to pump and / or meter the fluid.Multi-displacer assembly 110 provides significant advantages. Valve assembly 119 fluidly connects and disconnects multiple pumping chambers 94 of multiple pumps 116 to both the inflow of fluid to multi-displacer assembly 110 and the outflow of fluid from multi-displacer assembly 110. The fluid displacers 140 are driven out of phase relative to each other, which provides for a smooth outflow and reduces pulsation. The valve assembly 119 sequentially connects and disconnects the pumps 116 from the inflow to and outflow from multi -displacer assembly 110. The sequential fluid connection facilitates out of phase driving of multiple fluid displacers 140, particularly of fluid displacers 140 disposed other than 90-degrees out of phase. Such a configuration provides for a smooth flow output from multi-displacer assembly 110 and reduces pulsation.Valve shaft 144 rotates on valve axis VA and actuates pump valves 149a, 149b. Rotation of valve shaft 144 controls actuation of pump valves 149a, 149b between open and closed states. The valve shaft 144 actively regulates fluid checking for each of the multiple pumps 116. The rotating valve shaft 144 controls fluid checking for both inflow to the pumps 116 and outflow from the pumps 116. The valve shaft 144 controls actuation of each of the pump valves 149a, 149b of the multiple pumps 116, which ensuresthe inflows and outflows of the various pumps 116 are properly synched to provide a consistent flow from multi-displacer assembly 110.In the examples shown, the valve seals 201 move into and out of radial overlap with the valve seats 203 to close and open the flowpaths through the pump valves 149a, 149b. The pump valves 149a, 149b do not require direct physical contact between the valve seal 201 and valve seat 203 to provide fluid sealing in this example. The pump valves 149a, 149b can transition from open to closed without a hard stop, such as is utilized in ball check valves. Such a configuration can reduce vibration and pulsation, thereby providing for smoother, more even flow while also reducing noise.Drive 114 is configured to cause linear displacement of fluid displacers 140 and rotational displacement of valve shaft 144. The valve shaft 144 causes linear displacement of valve seals 201 to control opening and closing of the pump valves 149a, 149b. The drive 114 provides a single dynamic input to multi-displacer assembly 110 that causes both pumping by the pumps 116 and active checking of the pumps 116. The valve shaft 144 rotates in a 1: 1 configuration with the drive 114, such that multi-displacer assembly 110 does not require complicated gearing to change rotational speeds. The drive 114 providing both linear input to the fluid displacers 140 and rotational input to valve shaft 144 links fluid displacers 140 and valve assembly 119 to ensure desired alignment and checking of flowpaths at desired times during the stroke of the fluid displacers 140.Multi-displacer assembly 110 can be utilized across multiple dispense operations and for multiple purposes. For example, multi-displacer assembly 110 can be configured for dispensing of a high viscosity fluid (e.g., without limitation, a sealant, adhesive, foam, or gasketing material). In some examples, multi-displacer assembly 110 is configured to produce sufficient outlet fluid pressure to create fluid atomization at a nozzle outlet (not shown), thereby allowing the system to be used in airless spraying applications. In some examples, multi-displacer assembly 110 can be used as a meter (i.e., a dosing pump), such as the fluid meters (or dosing pumps) used with a liquid proportioner. In some examples, multi-displacer assembly 110 is not used as a fluid pump but instead as an air motor when driven with compressed air in order to create a rotational force (or multiple, phased linear forces if not coupled with a drive 114).FIG. 13 is a graph illustrating displacement by a four displacer assembly. FIG. 14 is a graph illustrating displacement by a multi-displacer assembly 10, 110 including five displacers. FIGS. 13 and 14 are discussed together. In both FIGS. 13 and 14, the vertical axis on the left side is volumetric fluid displacement in cubic inches. Thevolumetric displacement is shown as the displacement output of the assembly, which is the combined output of the multiple pumps. The vertical axis on the right side is linear position of the fluid displacer of each pump, measured in inches. The horizontal axis represents the relative position of the drive 14, 114 for a full rotation, over which each fluid displacer completes one full pump cycle (including a fill stroke and a pressure stroke).As shown in FIG. 13, the displacement output from an assembly including four pumps varies throughout a full pump cycle of each of the pumps. Each pump outputs fluid as the fluid displacer moves downward through a pressure stroke from a top of a stroke to the bottom of the stroke. Each pump receives fluid as the fluid displacer moves upward through a fill stroke from the bottom of a stroke to the top of the stroke.With four pumps operating out of phase, the output from the assembly, shown as the dispensed volume, can vary by up to about 30% between the minimum output and the maximum output. At the inflection points Pl at which the output is at a minimum, one pump is filling, one pump is dispensing, and the other two pumps are going through changeovers, one from outputting to receiving and one from receiving to outputting. The output increases as the pump that is changing over from filling to outputting accelerates from the standstill at changeover. The output reaches a maximum at inflection point P2 and then one of the outputting pumps begins to decelerate into changeover, decreasing output from the assembly.As shown in FIG. 14, the displacement output from an assembly including five pumps varies throughout a full pump cycle of each of the pumps. Each pump outputs fluid as the fluid displacer moves downward through a pressure stroke from a top of a stroke to the bottom of the stroke. Each pump receives fluid as the fluid displacer moves upward through a fill stroke from the bottom of a stroke to the top of the stroke.With five pumps operating out of phase, the output from the assembly, shown as the dispensed volume, can vary by up to about 5% between the minimum output and the maximum output. The multi-displacer assembly outputs a flow that has a greater number of pulsations with significantly less variance in flow with each pulsation, providing a smooth output.At the inflection points IP1 at which the output is at a minimum, two pumps are filling, two pumps are dispensing, and the other pump is going through changeover from a fill stroke to a pressure stroke. The output increases as the pump that is changing over from filling to dispensing accelerates from the standstill at changeover. The output reaches a maximum at inflection points IP2 with two of the pumps moving throughrespective filling strokes and three pumps moving through respective pressure strokes. One of the pumps moving through a pressure stroke is accelerating out of changeover and another of the pumps moving through the pumping stroke is decelerating into a changeover.At the inflection points IP3 at which the output is at a minimum, two pumps are filling, two pumps are dispensing, and the other pump is going through changeover from a pressure stroke to a fill stroke. The output increases as the pump that is changing over from dispensing to filling accelerates from the standstill at changeover. The output reaches a maximum at inflection points IP4 with three of the pumps moving through respective filling strokes and two pumps moving through respective pressure strokes. One of the pumps moving through a filling stroke is accelerating out of changeover and another of the pumps moving through the filling stroke is decelerating into a changeover. As shown, the output from the five displacer multi-displacer assembly 10 or multi-displacer assembly 110 has a smooth flow output and less variation between minimum and maximum volumetric flowrates as compared to the four displacer assembly. The output from the multi-displacer assembly 10, 110 is also greater than the output of the four displacer assembly as more fluid displacers can be simultaneously moving through respective pumping stroke with the pumps operating out of phase. The five displacer multi-displacer assembly 10, 110 can have three fluid displacers outputting simultaneously while the four displacers operating 90-degrees out of phase include a maximum of two displacers outputting simultaneously. The rotational valve 18 and / or valve assembly 119 provides active checking for out of phase pump operation regardless of the number of pumps. The rotational valve 18 and / or valve assembly 119 can facilitate a multi -displacer assembly 10, 110 that provides a relatively smooth output, providing for improved metering and consistent flow from multi-displacer assembly 10, 110.FIG. 15 is a block diagram of dispense system 1000. Dispense system 1000 includes a multi-displacer assembly 10, 110 for metering flow of material to a dispenser 1020. Dispense system 1000 can be disposed along a manufacturing line. Dispense system 1000 is configured to output material at desired locations. For example, dispense system 1000 can be configured to dispense structural adhesive to structurally join components together. In some examples, dispense system 1000 can be in an automotive manufacturing system.Material, such as higher viscosity fluids (e.g., sealant, adhesive, foam, gasketing material, among other options), is stored in primary reservoirs 1002. Dispense system 1000 includes robotic applicator 1004 and material supply system 1006. In someexamples, robotic applicator 1004 is configured as a multi-axis robotic arm. For example, robotic applicator 1004 can be configured as an articulated arm robot. Robotic applicator 1004 is configured to position the dispense nozzle 1008 of material supply system 1006 during material output.Material supply system 1006 is configured to provide material under pressure for output through the dispense nozzle 1008. Material supply system 1006 is configured to drive material from a primary reservoir 1002 to the dispense nozzle 1008.Press 1012 is configured to pressurize the material within primary reservoir 1002. The material within primary reservoir 1002 is pressurized upstream of primary feed pump 1010 to facilitate priming of primary feed pump 1010 and maintaining such prime. In the example shown, the press 1012 includes platen 1014 that is configured to press down on the material within primary reservoir 1002. Platen 1014 can be formed as a plate, among other options. Primary reservoir 1002 can be formed as a drum that platen 1014 can move within. Platen 1014 can be configured to fluidly seal against the interior wall of the drum forming primary reservoir 1002.Platen 1014 is connected press drive 1016. In the example shown, the platen 1014 is connected to press drive 1016 by press frame 1018, which can be formed by one or more of rods and plates, among other options. Press drive 1016 is configured to displace platen 1014 within primary reservoir 1002 to generate the pressure in the primary reservoir 1002. In the example shown, press 1012 is configured to shift along press axis PRA. The platen 1014 can be driven into primary reservoir 1002 along a press axis PRA to pressurize the material. The platen 1014 can be withdrawn from the primary reservoir 1002 along axis PRA to allow for removal and replacement of the primary reservoir 1002.Press drive 1016 is configured to displace platen 1014 axially along press axis PRA. For example, press drive 1016 can be formed by one or more rams, which can be pneumatically driven among other options. In some examples, press 1012 is configured to provide a constant pressure within primary reservoir 1002. For example, the press drive 1016 can displace platen 1014 until a certain resistance is met, the resistance indicating that the pressure in the primary reservoir 1002 is at a desired supply pressure. The primary reservoir 1002 can be pressurized up to a prime pressure. The prime pressure can, in some examples, be up to about 500psi (about 3.447 MPa), though it is understood that the prime pressure can be higher or lower. It is further understood that some examples of material supply system 1006 may not include a press 1012 that pressurizes the primary reservoir 1002.Primary feed pump 1010 is configured to draw material from primary reservoir 1002 and drive the material downstream to dispenser 1020 under pressure. Primary feed pump 1010 can be of any desired configuration for pumping the material. For example, the primary feed pump 1010 can be configured as a piston pump, among other options. In some examples, primary feed pump 1010 is configured as a double displacement pump such that primary feed pump 1010 outputs material during both a first stroke in a first direction and a second stroke in an opposite second direction. In some examples, primary feed pump 1010 is configured as a single displacement pump such that primary feed pump 1010 outputs material during one stroke (e.g., downstroke) and not the other (e.g., upstroke).Primary feed pump 1010 is fluidly connected to dispenser 1020 by hose assembly 1022. Hose assembly 1022 fluidly connects primary feed pump 1010 and dispenser 1020. Hose assembly 1022 can include one or more individual hoses, which can be heated hoses, among other options. For example, the heated portions of hose assembly 1022 can include one or more wires for resistive heating of the material flowing in the heated hose assembly 1022.Dispenser 1020 is mounted on robotic applicator 1004. Dispenser 1020 is configured to receive the material from hose assembly 1022 and to output the material through dispense nozzle 1008.Multi-displacer assembly 10, 110 is configured to regulate the flow of the material to the dispense nozzle 1008 such that dispenser 1020 provides the material at a desired pressure, flowrate, dispense rate, etc.Dispense valve 1024 is disposed downstream of multi-displacer assembly 10, 110. Dispense valve 1024 is actuatable between open and closed states. Opening of dispense valve 1024 allows for dispensing of material through dispense nozzle 1008 and closing of dispense valve 1024 prevents dispensing of material through dispense nozzle 1008. Dispense valve 1024 can be configured as a needle valve, among other options. Dispense valve 1024 can be actuated in any desired manner, such as pneumatically, hydraulically, electrically (e.g., by a solenoid), among other options.While the invention(s) has been described with reference to an exemplary embodiment(s), it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention(s) without departing fromthe essential scope thereof. Therefore, it is intended that the invention(s) not be limited to the particular embodiment(s) disclosed, but that the invention(s) may include all embodiments falling within the scope of the appended claims. Any single feature, or any combination of features from one embodiment show herein, may be utilized in a different embodiment independent from the other features shown in the embodiment herein.Accordingly, the scope of the invention(s) and any claims thereto are not limited to the particular to the embodiments and / or combinations of the features shown herein, but rather can include any combination of one, two, or more features shown herein.

Claims

CLAIMS:

1. A multi-displacer assembly comprising: an assembly body having an assembly inlet port and an assembly outlet port; a plurality of pumps arrayed around a valve axis and disposed radially outward from the valve axis, wherein each pump of the plurality of pumps includes a first pump valve disposed between the assembly inlet port and a pump chamber of the pump and a second pump valve disposed between the pump chamber of the pump and the assembly outlet port; and a valve shaft at least partially disposed within a valve bore in the assembly body, wherein the valve shaft mechanically actuates the first pump valve from a first open state to a first closed state and mechanically actuates the second pump valve from a second open state to a second closed state.

2. The multi-displacer assembly of claim 1 , wherein the valve shaft includes a first cam interfacing with the first pump valve.

3. The multi-displacer assembly of claim 2, wherein the valve shaft includes a second cam interfacing with the second pump valve.

4. The multi-displacer assembly of any one of claims 1-3, wherein the pump bore is fluidly isolated from fluid flow through the assembly body between the assembly inlet port and the assembly outlet port.

5. The multi-displacer assembly of any one of claims 1-4, wherein the first pump valve comprises: a valve seal configured to translate along a seal axis; and a valve seat; wherein the valve seal sealingly interfaces with the valve seat to place the first pump valve in the first closed state.

6. The multi-displacer assembly of claim 5, wherein the valve seal does not contact the valve seat to sealingly interface with the valve seat.

7. The multi-displacer assembly of any one of claims 5 and 6, wherein the valve seal includes a seal head and a seal shaft, the seal head configured to interface with the valve seat.

8. The multi-displacer assembly of claim 7, wherein the seal head has a first diameter, the seal shaft has a second diameter, and the second diameter is larger than the first diameter.

9. The multi-displacer assembly of claim 7, wherein the valve seal includes a valve shoulder that extends radially outward relative to the seal axis between an exterior of the seal head and an exterior of the seal shaft.

10. The multi-displacer assembly of any one of claims 7-9, wherein the seal head is formed separately from the seal shaft.

11. The multi-displacer assembly of any one of claims 5-10, wherein the valve seat is formed as an annular ring, and wherein the valve seal is configured to translate within the annular ring to change an overlap between the valve seal and the annular ring while the first pump valve is maintained in the first closed state.

12. The multi -displacer assembly of any one of claims 5-11, further comprising: a valve bearing supporting the valve seal.

13. The multi-displacer assembly of claim 12, wherein the valve seal extends fully axially through the valve bearing along the seal axis.

14. The multi-displacer assembly of any one of claims 12 and 13, wherein the valve bearing is formed as a bushing.

15. The multi-displacer assembly of any one of claims 1-14, wherein the first pump valve does not include a spring.

16. The multi-displacer assembly of claim 15, wherein the second pump valve does not include a spring.

17. The multi-displacer assembly of any one of claims 1-16, wherein the first pump valve is configured to be fluidically opened and mechanically closed.

18. The multi-displacer assembly of claim 17, wherein the second pump valve is configured to be fluidically opened and mechanically closed.

19. The multi-displacer assembly of any one of claims 1-18, wherein the second pump valve is configured the same as the first pump valve.

20. The multi-displacer assembly of any one of claims 1-19, wherein the plurality of pumps includes at least five pumps.

21. The multi-displacer assembly of any one of claims 1-20, wherein the plurality of pumps includes an odd number of pumps.

22. The multi-displacer assembly of any one of claims 1-21, further comprising: a drive configured to receive a rotational input and output a linear output to the plurality of pumps and output a rotational output to the valve shaft.

23. The multi-displacer assembly of claim 22, wherein the drive includes a driveshaft and an eccentric.

24. The multi -displacer assembly of claim 23, wherein the drive includes a plate that outputs the linear motion to the plurality of pumps.

25. The multi-displacer assembly of any one of claims 22-24, wherein the drive is a wobble drive.

26. The multi-displacer assembly of any one of claims 22-25, wherein the valve shaft is connected to the drive to rotate 1 : 1 with the rotational input to the drive.

27. The multi-displacer assembly of any one of claims 22-26, wherein the drive is configured to rotate on a drive axis disposed coaxially with the valve axis.

28. The multi-displacer assembly of any one of claims 1-27, wherein the valve shaft is configured to fluidly connect a first subset of the plurality of pumps to the assembly inlet port and simultaneously fluidly connect a second subset of the plurality of pumps to the assembly outlet port, the first subset of the plurality of pumps distinct from the second subset of the plurality of pumps.

29. The multi-displacer assembly of claim 28, wherein both the first subset and the second subset include multiple pumps of the plurality of pumps.

30. The multi-displacer assembly of claim 29, wherein: the first subset includes a first count of pumps of the plurality of pumps with the rotational valve in a first state; and the first subset includes a second count of pumps of the plurality of pumps with the rotational valve in a second state, the first count of pumps differing from the second count of pumps.

31. The multi-displacer assembly of claim 30, wherein the first count of pumps is three and the second count of pumps is two.

32. The multi-displacer assembly of any one of claims 30 and 31, wherein: the second subset includes the second count of pumps of the plurality of pumps with the rotational valve in the first state; andthe second subset includes the first count of pumps of the plurality of pumps with the rotational valve in the first state.

33. A multi-displacer assembly comprising: an assembly body having an assembly inlet port and an assembly outlet port; a plurality of pumps arrayed around a valve axis and disposed radially outward from the valve axis, wherein each pump of the plurality of pumps includes a first pump valve disposed between the assembly inlet port and a pump chamber of the pump and a second pump valve disposed between the pump chamber of the pump and the assembly outlet port; and a valve shaft at least partially disposed within a valve bore in the assembly body, the valve shaft comprising: a first cam interfacing with the first pump valve of each pump of the plurality of pumps; and a second cam interfacing with the second pump valve of each pump, the second cam spaced axially from the first cam along the valve axis; wherein the valve shaft is configured to rotate on a valve axis and the first cam mechanically actuates the first pump valve of each pump of the plurality of pumps from a respective first open state to a respective first closed state and the second cam mechanically actuates the second pump valve of each pump of the plurality of pumps from a respective second open state to a respective second closed state.

34. The multi-displacer assembly of claim 33, wherein fluid pressure upstream of the pump chamber of each pump of the plurality of pumps biases the first pump valve of each pump of the plurality of pumps to ride on the valve shaft.

35. The multi-displacer assembly of any one of claims 33 and 34, wherein a nose of the first cam is disposed 180-degrees apart from a nose of the second cam.

36. A multi-displacer assembly comprising: an assembly body having an assembly inlet port and an assembly outlet port; a plurality of pumps arrayed around a valve axis and disposed radially outward from the valve axis; and a rotational valve at least partially disposed within a valve bore within the assembly body, the valve bore fluidly connected to each pump of theplurality of pumps, the rotational valve configured to rotate on the valve axis to actively check fluid flow into and out of the plurality of pumps.

37. The multi-displacer assembly of claim 36, wherein each pump of the plurality of pumps comprises: a fluid displacer configured to reciprocate along a pump axis, the fluid displacer at least partially disposed within a pump bore formed in the assembly body; and a pump chamber fluidly connected to the valve bore within the assembly body.

38. The multi-displacer assembly of any one of claims 36 and 37, wherein rotational valve comprises: a first valve passage open through an exterior of the rotational valve, the first valve passage fluidly connected to the assembly inlet port; and a second valve passage open through the exterior of the rotational valve, the second valve passage fluidly connected to the assembly outlet port.

39. The multi-displacer assembly of claim 38, wherein the rotational valve is configured to rotate between a first state the first valve passage is fluidly connected to a first subset of the plurality of pumps while the second valve passage is fluidly disconnected from the first subset and a second state in which the first valve passage is fluidly connected to a second subset of the plurality of pumps while the second valve passage is fluidly connected to the first subset of the plurality of pumps.

40. The multi-displacer assembly of any one of claims 38 and 39, wherein the rotational valve further comprises: a valve shaft configured to rotate on a valve axis; a first valve flowpath formed within the valve shaft, the first valve flowpath fluidly connected to the assembly inlet port, the first flowpath including the first valve passage open through the valve shaft; a second valve flowpath formed within the valve shaft, the second valve flowpath fluidly isolated from the first valve flowpath and fluidly connected to the assembly outlet port, the second valve flowpath including the second valve passage open through the valve shaft.

41. The multi-displacer assembly of any one of claims 38-40, wherein an opening of the first valve passage through the exterior of the rotational valve does notaxially overlap with an opening of the second valve passage through the exterior of the rotational valve.

42. The multi-displacer assembly of any one of claims 38-41, wherein the first valve passage extends at least partially about the valve axis.

43. The multi-displacer assembly of claim 42, wherein the first valve passage extends up to 170-degrees about the valve axis.

44. The multi-displacer assembly of claim 43, wherein the first valve passage extends up to 140-degrees about the valve axis.

45. The multi-displacer assembly of claim 44, wherein the first valve passage extends up to 135-degrees about the valve axis.

46. The multi-displacer assembly of any one of claims 42-45, wherein the second valve passage extends at least partially about the valve axis.

47. The multi-displacer assembly of claim 46, wherein the first valve passage extends up to 170-degrees about the valve axis.

48. The multi-displacer assembly of claim 47, wherein the second valve passage extends up to 140-degrees about the valve axis.

49. The multi-displacer assembly of claim 48, wherein the second valve passage extends up to 135-degrees about the valve axis.

50. The multi-displacer assembly of any one of claims 36-49, wherein the plurality of pumps includes at least five pumps.

51. The multi-displacer assembly of any one of claims 36-50, wherein the plurality of pumps includes an odd number of pumps.

52. The multi-displacer assembly of any one of claims 36-51, further comprising: a drive configured to receive a rotational input and output a linear output to the plurality of pumps and output a rotational output to the rotational valve.

53. The multi-displacer assembly of claim 52, wherein the drive includes a driveshaft and an eccentric.

54. The multi-displacer assembly of claim 53, wherein the drive includes a plate that outputs the linear motion to the plurality of pumps.

55. The multi-displacer assembly of any one of claims 52-54, wherein the drive is a wobble drive.

56. The multi-displacer assembly of any one of claims 52-54, wherein the rotational valve is connected to the drive to rotate 1 : 1 with the rotational input to the drive.

57. The multi-displacer assembly of any one of claims 52-56, wherein the drive is configured to rotate on a drive axis disposed coaxially with the valve axis.

58. A multi-displacer assembly comprising: an assembly body having an assembly inlet port and an assembly outlet port; a plurality of pumps arrayed around a valve axis and disposed radially outward from the valve axis, wherein each pump of the plurality of pumps comprises: a fluid displacer configured to reciprocate along a pump axis, the fluid displacer at least partially disposed within a pump bore formed in the assembly body; and a pump chamber fluidly connected to a valve bore within the assembly body; and a rotational valve at least partially disposed in the valve bore and configured to rotate on the valve axis, the rotational valve comprising: a first valve passage open through an exterior of the rotational valve, the first valve passage fluidly connected to the assembly inlet port; and a second valve passage open through the exterior of the rotational valve, the second valve passage fluidly connected to the assembly outlet port; wherein the rotational valve is configured to rotate between a first state the first valve passage is fluidly connected to a first subset of the plurality of pumps while the second valve passage is fluidly disconnected from the first subset and a second state in which the first valve passage is fluidly connected to a second subset of the plurality of pumps while the second valve passage is fluidly connected to the first subset of the plurality of pumps.

59. The multi-displacer assembly of claim 58, wherein each pump of the plurality of pumps further comprises:a seal assembly sealing between the fluid displacer and the assembly body, the fluid displacer configured to reciprocate relative to the seal assembly.

60. The multi-displacer assembly of any one of claims 58 and 59, further comprising: a plurality of first feed bores, wherein each first feed bore of the plurality of first feed bore extends between the valve bore and the pump bore of a single pump of the plurality of pumps.

61. The multi-displacer assembly of claim 60, wherein each first feed bore of the plurality of first feed bores extends through a lateral side of the assembly body.

62. The multi-displacer assembly claim 61 , wherein each first feed bore of the plurality of first feed bores extends radially outward from the valve and orthogonal to a plane tangential to the lateral side.

63. The multi-displacer assembly of any one of claims 60-62, further comprising: a plurality of second feed bores, wherein each second feed bore of the plurality of second feed bore extends between the valve bore and the pump bore of a single pump of the plurality of pumps.

64. The multi-displacer assembly of claim 63, wherein each second feed bore of the plurality of second feed bores extends through a lateral side of the assembly body.

65. The multi-displacer assembly claim 63, wherein each second feed bore of the plurality of second feed bores extends radially outward from the valve and orthogonal to a plane tangential to the lateral side.

66. The multi-displacer assembly of any one of claims 63-65, wherein the plurality of first feed bores axially overlap with the plurality of second feed bores.

67. The multi-displacer assembly of any one of claims 60-66, wherein the plurality of first feed bores are evenly arrayed about the valve axis.

68. The multi-displacer assembly of any one of claims 58-67, wherein the rotational valve further comprises: a first valve port open through the exterior of the rotational valve and fluidly connected to the first valve passage; a second valve port open through the exterior of the rotational valve and fluidly connected to the second valve passage.

69. The multi-displacer assembly of claim 68, wherein the first valve passage and the second valve passage are disposed axially between the first valve port and the second valve port.

70. The multi-displacer assembly of any one of claims 68 and 69, wherein the first valve port is oriented radially and the second valve port is oriented axially.

71. The multi-displacer assembly of any one of claims 68-70, wherein the rotational valve includes a plurality of the first valve ports.

72. The multi-displacer assembly of any one of claims 68-71 , wherein the rotational valve includes an annular groove extending into an exterior of the rotational valve, and wherein the first valve port is open into the annular groove.

73. The multi-displacer assembly of any one of claims 58-72, wherein the rotational valve is configured such that the rotational valve fluidly connects a first subset of the plurality of pumps to the assembly inlet port and simultaneously fluidly connects a second subset of the plurality of pumps to the assembly outlet port, the first subset of the plurality of pumps distinct from the second subset of the plurality of pumps.

74. The multi-displacer assembly of claim 73, wherein both the first subset and the second subset include multiple pumps of the plurality of pumps.

75. The multi-displacer assembly of claim 74, wherein: the first subset includes a first count of pumps of the plurality of pumps with the rotational valve in a first state; and the first subset includes a second count of pumps of the plurality of pumps with the rotational valve in a second state, the first count of pumps differing from the second count of pumps.

76. The multi-displacer assembly of claim 75, wherein the first count of pumps is three and the second count of pumps is two.

77. The multi-displacer assembly of any one of claims 75 and 76, wherein: the second subset includes the second count of pumps of the plurality of pumps with the rotational valve in the first state; and the second subset includes the first count of pumps of the plurality of pumps with the rotational valve in the first state.

78. The multi-displacer assembly of any one of claims 58-77, wherein the plurality of pumps includes at least five pumps.

79. A multi-displacer assembly comprising: an assembly body having an assembly inlet port and an assembly outlet port;a rotational valve at least partially disposed in a valve bore within the assembly body, the rotational valve comprising: a valve shaft configured to rotate on a valve axis; a first valve flowpath formed within the valve shaft, the first valve flowpath fluidly connected to the assembly inlet port, the first flowpath including a first valve passage open through the valve shaft; a second valve flowpath formed within the valve shaft, the second valve flowpath fluidly isolated from the first valve flowpath and fluidly connected to the assembly outlet port, the second valve flowpath including a second valve passage open through the valve shaft; a plurality of pumps arrayed around the valve axis and disposed radially outward from the valve axis, wherein each pump of the plurality of pumps comprises: a fluid displacer configured to reciprocate along a pump axis, the fluid displacer at least partially disposed within a pump bore formed in the assembly body; and a pump chamber fluidly connected to the valve bore; wherein the rotational valve is configured to rotate on the valve axis such that the first valve flowpath sequentially fluidly connects with the pumps of the plurality of pumps and such that the second valve flowpath sequentially fluidly connects with the pumps of the plurality of pumps out of sequence with the first valve flowpath.

80. The multi-displacer assembly of claim 79, wherein the rotational valve includes a shaft bore extending into the valve shaft, wherein the first valve flowpath and the second valve flowpath are each at least partially formed within the shaft bore.

81. The multi-displacer assembly of claim 80, further comprising: a valve plug mounted in the shaft bore and fluidly separating the first valve flowpath and the second valve flowpath.

82. The multi-displacer assembly of any one of claims 79-81, wherein each pump axis is disposed parallel to the valve axis.

83. The multi-displacer assembly of any one of claims 79-82, wherein the plurality of pumps are evenly arrayed about the valve axis.

84. The multi-displacer assembly of any one of claims 79-83, further comprising: a drive configured to receive a rotational input, provide a linear output the plurality of pumps, and provide a rotational output to the valve shaft.

85. The multi-displacer assembly of claim 84, wherein the drive interfaces with the fluid displacer of each pump of the plurality of pumps such that the drive can exert a driving force on the fluid displacer in a first axial direction and not in a second axial direction.

86. The multi-displacer assembly of any one of claims 84 and 85, wherein the drive includes a driveshaft connected to the valve shaft to provide the rotational output to the drive shaft.

87. The multi-displacer assembly of claim 86, wherein the driveshaft and valve shaft are connected at a keyed interface.

88. The multi-displacer assembly of claim 87, wherein the keyed interface is formed by a portion of the driveshaft extending into the valve shaft.

89. The multi-displacer assembly of any one of claims 84-88, wherein the fluid displacer of each pump of the plurality of pumps is disconnected from the drive.

90. The multi-displacer assembly of any one of claims 84-89, wherein the drive includes an eccentric and a plate.

91. The multi-displacer assembly of any one of claims 79-90, wherein the plurality of pumps includes at least five pumps.

92. The multi-displacer assembly of any one of claims 79-91, wherein the first valve passage is open radially through the valve shaft and the second valve passage is open radially through the valve shaft.

93. The multi-displacer assembly of any one of claims 79-92, wherein an opening of the first valve passage on an exterior of the valve shaft arcs at least partially around the valve axis.

94. The multi-displacer assembly of claim 93, wherein an opening of the second valve passage on an exterior of the valve shaft arcs at least partially around the valve axis.

95. The multi-displacer assembly of any one of claims 79-92, wherein an opening of the second valve passage on an exterior of the valve shaft arcs at least partially around the valve axis.

96. The multi-displacer assembly of any one of claims 79-95, wherein the first valve passage does not axially overlap with the second valve passage.

97. A method of displacing fluid with a multi-displacer assembly, the method comprising: driving reciprocation of a plurality of fluid displacers of a plurality of pumps, the plurality of pumps arrayed circumferentially around and radially outward of a valve axis; and rotating a rotational valve on the valve axis to sequentially fluidly connect and disconnect the plurality of pumps from an assembly inlet port that receives fluid into the multi-displacer assembly and sequentially fluidly connect and disconnect the plurality of pumps from an assembly outlet port that outputs the fluid from the multi-displacer assembly, the rotational valve fluidly isolating the assembly inlet port from the assembly outlet port throughout rotation.

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