Adapter for mounting a filter to a hydraulic manifold

Abstract

A filter adapter connects a canister filter to a hydraulic manifold block. The adapter includes a hexagonal tool receiving portion, an outflow passage, and one or more inflow passages. The outlet flow passage extends between opposite ends of the adapter and is used to direct filtered fluid from the filter to the manifold block. The one or more inlet flow passages extend between an end of the adapter and a sealing region and are used to direct fluid from the manifold block to the filter. The adapter includes a secondary port formed in the tool receiving portion that is in communication with the inlet flow passage and allows monitoring thereof.

Description

Technical Field

[0001] This invention relates to an adapter for mounting a filter to a hydraulic manifold. Background Technology

[0002] For circuit design purposes, hydraulic systems may include hydraulic manifolds. Hydraulic manifolds are designed with internal cavities that define reservoirs or fluid passages. Furthermore, hydraulic manifolds may include external mounting configurations that allow for the integration of valves, pumps, filters, and / or other features into the hydraulic circuit. Typically, hydraulic circuits require filtration of hydraulic fluids, and integrating a filter into the hydraulic manifold may be necessary and / or advantageous. For system pressures of 725 psi (50 bar) or lower, spin-on canister filters may be suitable for filtering the hydraulic fluid. Canister filters are industry standard and are generally the most economical choice from a cost perspective. Canister filters can be attached to predefined studs and sealing surfaces using British Standard Parallel Pipe (BSPP) threads (also known as “G threads”) or fine threads of the Unified Thread Series (UNF). The required pattern for the mounting interface is difficult to machine onto the hydraulic manifold surface, so providing mounting interfaces for hydraulic manifolds can be expensive. For this reason, it is desirable to be able to easily connect canister filters to hydraulic manifolds without the challenges and costs associated with providing standard mounting interfaces. Summary of the Invention

[0003] A filter adapter is provided that allows for easy connection of relatively inexpensive canister filters to hydraulic manifolds in a low-cost manner, thereby enabling the use of canister filters without the challenge of providing standard mounting interfaces.

[0004] The adapter includes a stud projecting from its first end. The stud is concentric with a longitudinal axis and has a first external thread, the shape and size of which are designed to engage with the internal thread of a canister filter. The adapter includes a second external thread disposed between the stud and a second end of the adapter, the shape and size of which are designed to engage with a corresponding internal connection structure of a fluid manifold cavity. The adapter includes a circumferentially extending first groove, the shape and size of which are designed to receive a first annular seal. The first annular seal provides a first fluid seal between the surfaces of the adapter and the manifold cavity. The first groove is disposed between the stud and the second external thread. The adapter includes a circumferentially extending second groove, the shape and size of which are designed to receive a second annular seal. The second annular seal provides a second fluid seal between the surfaces of the adapter and the manifold cavity. The second groove is disposed between the second external thread and the second end, and the portion of the adapter disposed between the first groove and the second groove corresponds to a sealing area of ​​the adapter. The adapter includes a tool receiving portion disposed between the first external thread and the first groove, and the tool receiving portion has a polygonal cross-sectional shape. The adapter includes an outflow channel and one or more inflow channels. An outlet flow passage extends between the first and second ends through the sealing region without fluid communication with it, and is used to guide filtered fluid from the filter to the manifold. One or more inlet flow passages extend between the first end and the sealing region, and are used to guide fluid from the manifold block to the filter.

[0005] In addition, the adapter includes one or more auxiliary ports axially located between the manifold and the filter, and an auxiliary channel extending between each auxiliary port and the inlet flow passage. The auxiliary ports provide pathways for fluid flow and / or provide external monitoring capabilities for the hydraulic circuit. Other uses not defined herein (such as requiring inlet flow and pressure data) are possible.

[0006] The number of auxiliary ports and auxiliary channels is limited to the number of existing inlet flow channels. Each auxiliary port opens along the flat side of the tool receiving section, and each auxiliary channel intersects a corresponding inlet flow channel. The auxiliary channels extend radially to be oriented perpendicular to the corresponding inlet flow channel. The perpendicular arrangement of one or more auxiliary channels to the inlet flow channels facilitates unobstructed passage and flexibility without additional adapter complexity. Because they intersect with the inlet flow channels, the auxiliary channels are exposed to the inflow fluid flow rate and pressure. Unused ports can be capped using industry-standard plugs.

[0007] By integrating one or more auxiliary ports with the filter adapter, the machining requirements of the hydraulic manifold are further reduced. Furthermore, the auxiliary ports can be used immediately or after commissioning without removing the filter adapter or performing additional machining. The auxiliary ports provide industry-standard connection interfaces, allowing connection to multiple devices. The adapter height can be minimized by placing the ports on a flat surface of the tool receiving portion (e.g., a "wrench flat surface"), rather than adding material to the neck of the adapter to provide the auxiliary port's location. Moreover, positioning the ports on a flat surface of the tool receiving portion facilitates precise manufacturing compared to machining curved surfaces.

[0008] In some aspects, the adapter includes a first end and a stud projecting from the first end. The end face of the stud includes a first fluid port. The adapter includes a second end. The second end is opposite to the first end, and the end face of the second end includes a second fluid port. Furthermore, the adapter includes an outlet flow channel extending between the first fluid port and the second fluid port. The outer surface of the adapter includes a first connecting structure disposed on the stud, a second connecting structure disposed between the first connecting structure and the second end, and a tool receiving portion disposed between the first connecting structure and the second connecting structure. The tool receiving portion has a polygonal cross-sectional shape. The outer surface of the adapter includes a circumferentially extending first groove disposed between the tool receiving portion and the second connecting structure, the first groove being configured to receive part of a first seal. Furthermore, the outer surface of the adapter includes a circumferentially extending second groove disposed between the end faces of the second connecting structure and the second end, the second groove being configured to receive part of a second seal. The adapter further includes a third fluid port disposed between the second connecting structure and the second groove, a fourth fluid port disposed between the first connecting structure and the tool receiving portion, and an inlet flow channel extending between the third fluid port and the fourth fluid port. The adapter includes an auxiliary port with an opening on one side of the tool receiving section, and an auxiliary channel extending between the auxiliary port and the inlet flow channel.

[0009] In some embodiments, the auxiliary channel is perpendicular to the inlet flow channel.

[0010] In some embodiments, the outlet flow channel is coaxial with the longitudinal centerline of the adapter.

[0011] In some embodiments, the inlet flow channel is arranged radially outward relative to the outlet flow channel.

[0012] In some embodiments, the outlet flow channel is parallel to the inlet flow channel.

[0013] In some embodiments, the inlet flow channel includes at least two inlet flow channels.

[0014] In some embodiments, the sum of the cross-sectional areas of the combined at least two inlet flow channels is sufficient to accept the nominal flow rate of a filter that can be connected to the first connection structure.

[0015] In some embodiments, at least two inlet flow channels are spaced apart from each other along a cylindrical section surrounding an outlet flow channel, the cylindrical section having a first diameter and the outlet flow channel having a second diameter smaller than the first diameter.

[0016] In some embodiments, the cylindrical section is concentric with the cross-section of the adapter, which includes the outlet flow channel.

[0017] In some embodiments, the adapter includes a tank mounting flange that projects radially relative to the longitudinal centerline of the adapter. The tank mounting flange is disposed between the first connection structure and the tool receiving portion, and a fourth fluid port opens at the filter-facing surface of the tank mounting flange.

[0018] In some embodiments, the polygonal cross-sectional shape is hexagonal.

[0019] In some embodiments, the first connection structure and the second connection structure are external threads.

[0020] In some aspects, the adapter is configured to connect a canister filter to a hydraulic manifold block. The adapter includes a first end, a second end opposite the first end, and a longitudinal axis extending through the first and second ends. The adapter includes a stud projecting from the first end. The stud is concentric with the longitudinal axis and has a first external thread. The first external thread is shaped and sized to engage with the internal thread of the canister filter. The adapter includes an external connection structure disposed between the stud and the second end. The external connection structure is shaped and sized to engage with a corresponding internal connection structure of a cavity in the hydraulic manifold block. The adapter includes first and second circumferentially extending recesses. The first recess is shaped and sized to receive a first annular seal and is disposed between the stud and the external connection structure. The second recess is shaped and sized to receive a second annular seal and is disposed between the external connection structure and the second end. The portion of the adapter disposed between the first and second recesses corresponds to a sealing region of the adapter. The adapter includes a tool receiving portion disposed between the first connection structure and the first recess. The tool receiving portion has a polygonal cross-sectional shape. The adapter includes an outlet flow channel extending between a first end and a second end to pass through a sealed region without fluid communication with the sealed region, and an inlet flow channel extending between the first end and the sealed region. The adapter also includes an auxiliary port opening on one side of the tool receiving portion, and an auxiliary channel extending between the auxiliary port and the inlet flow channel. Attached Figure Description

[0021] Figure 1This is a partially exploded side view of a filter adapter installed in the hydraulic manifold block and used to connect a canister filter to the hydraulic manifold block.

[0022] Figure 2 It is along Figure 1 The AA line seen Figure 1 A cross-sectional view of the component.

[0023] Figure 3 This is a 3D view of the bottom of a canister filter.

[0024] Figure 4 This is a 3D view of the filter adapter.

[0025] Figure 5 yes Figure 4 Another perspective view of the filter adapter.

[0026] Figure 6 yes Figure 4 A cross-sectional view of the filter adapter.

[0027] Figure 7 This is a perspective view of the filter adapter in an alternative embodiment.

[0028] Figure 8 yes Figure 7 Another perspective view of an alternative embodiment of the filter adapter.

[0029] Figure 9 yes Figure 7 A cross-sectional view of an alternative embodiment of the filter adapter, showing an open auxiliary channel.

[0030] Figure 10 yes Figure 7 A cross-sectional view of an alternative embodiment of a filter adapter, showing a plug disposed in one auxiliary channel and a monitoring device accessory disposed in another auxiliary channel.

[0031] Figure 11 It is installed in the hydraulic manifold and is used to connect a relatively large canister filter to the hydraulic manifold. Figure 7 An exploded cross-sectional view of an alternative embodiment of the filter adapter, showing a plug disposed in one auxiliary channel and a monitoring device accessory disposed in another auxiliary channel. Detailed Implementation

[0032] refer to Figure 1-3The hydraulic system may include a hydraulic manifold 2 that provides a reservoir and passageways and integrates valves, pumps, filters, and / or other features (not shown) into the hydraulic circuit. A filter adapter 20 is used to connect the hydraulic canister filter 10 and the hydraulic manifold 2 and serves as an interface between them. More specifically, the filter adapter 20 is detachably connected to a cavity 3 formed in the hydraulic manifold 2, such that a stud 36 of the filter adapter 20 can be accessed from the outside of the hydraulic manifold 2, and the canister filter 10 is detachably connected to the adapter stud 36. The filter adapter 20 guides fluid flowing within the hydraulic circuit into the canister filter 10 and returns filtered hydraulic fluid from the canister filter 10 to the hydraulic circuit. Furthermore, the filter adapter 20 includes one or more auxiliary ports 62 that allow monitoring devices, such as sensors, to be connected to the filter adapter 20. Therefore, the filter adapter 20 can be configured to allow the detection of fluid presence, the detection of fluid characteristics (such as temperature or pressure), and / or the performance of other circuit monitoring functions. The filter adapter 20 is described in detail below.

[0033] In the illustrated embodiment, the canister filter 10 is a spin-on hydraulic filter. The canister filter 10 may include a cylindrical metal housing 11 closed at both ends. The block-facing end of the housing 11 may include a filter center opening 12 through which filtered fluid exits the canister filter 10. The filter center opening 12 includes an internal thread 14 and provides an outlet through which filtered fluid flows out of the canister filter 10. The internal thread size depends on the specific application requirements, and commonly used thread sizes include, but are not limited to, UNF 1-12, UNF 1-1 / 2-16, BSPP ¾, and BSPP 1-1 / 4. The block-facing end of the housing 11 may include a plurality of filter inlet openings 15 with a smaller area compared to the area of ​​the filter center opening 12. The filter inlet openings 15 are distributed around the filter center opening 12. A gasket 16 is disposed on the block-facing end of the housing 11, surrounding both the filter inlet openings 15 and the filter center opening 12.

[0034] refer to Figure 4-6 The filter adapter 20 is configured to provide an easily accessible and operable interface between the canister filter 10 and the hydraulic manifold block 2. The filter adapter 20 is a rigid, generally cylindrical structure comprising a first end 22 configured to receive the canister filter 10 and a second end 24 opposite to the first end 22 and received within a cavity 3 of the hydraulic manifold block 2. The filter adapter 20 includes a longitudinal centerline 26 extending through the first and second ends 22, 24.

[0035] The filter adapter 20 has a non-uniform outer diameter. Specifically, the first end 22 of the filter adapter includes a mounting flange 30 extending radially outward relative to a longitudinal centerline 26. The filter adapter 20 includes an intermediate portion 31 abutting the mounting flange 30 and having an outer diameter smaller than that of the mounting flange 30. Furthermore, the filter adapter 20 includes an insertion portion 32 abutting the intermediate portion 31, and includes a second end 24 of the filter adapter with an outer diameter smaller than that of the intermediate portion 31. A shoulder 35 is formed at the diameter transition between the intermediate portion 31 and the insertion portion 32.

[0036] The mounting flange 30 provides a flat, filter-facing surface 33 that, in use, supports and forms a fluid seal with the gasket 16 of the canister filter 10. In addition to the mounting flange 30, the first end 22 of the filter adapter includes a stud 36 concentric with the longitudinal centerline 26 and projecting axially outward from the first end 22 relative to the mounting flange 30. The filter-facing surface 33 of the mounting flange 30 includes a shallow annular groove 23 surrounding the stud 36. The outer surface of the stud 36 provides a first connection structure 52 for connecting the filter adapter 20 to the canister filter 10. In the illustrated embodiment, the first connection structure 52 is an external helix or thread designed to engage the internal thread 14 of the filter canister.

[0037] The intermediate portion 31 includes a tool receiving portion 56, an annular first groove 58, and a second connecting structure 54. The tool receiving portion 56 abuts the surface 34 of the mounting flange 30 facing the manifold block and has a polygonal cross-sectional shape for easy gripping with a tightening tool such as a wrench. In the illustrated embodiment, the tool receiving portion 56 has a hexagonal cross-sectional shape. The outer surface of the intermediate portion 31 provides the second connecting structure 54 for connecting the filter adapter 20 to the hydraulic manifold block 2. In the illustrated embodiment, the second connecting structure 54 is an external helix or thread designed to engage a corresponding thread 8 provided in the hydraulic manifold block 2, as discussed in more detail below. In some embodiments, the thread constituting the second connecting structure 54 may be configured to include, but is not limited to, one of the following thread sizes: UNF 2-1 / 2-12, M60x2, M68x2. The first groove 58 is provided between the tool receiving portion 56 and the second connecting structure 54. The first groove 58 extends around the circumference of the intermediate portion 31 and is configured to receive and axially position the first seal 90, which may be an O-ring seal. In use, the first seal 90 forms a fluid seal with the surface of the cavity 3 of the hydraulic manifold block 2.

[0038] The insertion portion 32 has a cylindrical shape and includes an enlarged diameter portion 39 adjacent to the end face 28 of the second end 24 of the adapter. An annular second groove 60 is provided in the enlarged diameter portion 39 immediately adjacent to the end face 28 of the second end 24 of the adapter. The second groove 60 extends around the circumference of the insertion portion 32 and is configured to receive and axially position a second seal 92, which may be an O-ring seal. In use, the second seal 92 forms a fluid seal with the surface of the cavity 3 of the hydraulic manifold block 2.

[0039] The area between the first groove 58 and the second groove 60 is referred to as the sealing area 80 of the filter adapter 20. In use, the first and second seals 90 and 92 each form a fluid seal with the surface of the cavity 3 of the hydraulic manifold block 2, thereby isolating the portion of the side of the filter adapter 20 corresponding to the sealing area 80 from the end face 28 of the second end 24 of the adapter and the end face 38 of the stud 36 in a fluid-sealed manner. Furthermore, although the second connecting structure 54 and the shoulder 35 are located within the sealing area 80, the tool receiving portion 56 is located outside the sealing area 80.

[0040] The filter adapter 20 includes an outlet flow passage 50 extending between a first fluid port 40 located in the end face 38 of the stud 36 and a second fluid port 42 located in the end face 28 of the second end 24 of the filter adapter. The outlet flow passage 50 is coaxial with the longitudinal centerline 26. In the illustrated embodiment, the outlet flow passage 50 guides filtered fluid from the central opening 12 of the canister filter 10 to the hydraulic manifold block 2. The dimensions of the outlet flow passage 50 can be designed to match the expected flow rate corresponding to the dimensions of the canister filter 10 used with the filter adapter 20.

[0041] The filter adapter 20 includes at least two inlet flow channels 48. In the illustrated embodiment, the filter adapter includes six inlet flow channels 48. Each inlet flow channel extends between a corresponding third fluid port among a plurality of third fluid ports 44 located at the lowermost part of the recess 23 and a corresponding fourth fluid port among a plurality of fourth fluid ports 46 open in the shoulder 35. The term "lowest" herein is relative to... Figure 6 The orientation of the filter adapter 20 shown is for reference only and is not intended to be restrictive. Although the third fluid port 44 is located outside the sealed area 80, the fourth fluid port 46 is located inside the sealed area 80. In the illustrated embodiment, the inlet flow passage 48 guides unfiltered fluid from the hydraulic manifold block 2 to the inlet opening 15 of the canister filter 10.

[0042] Compared to the cross-sectional areas of the first and second fluid ports 40, 42 and the outlet flow channel 50, the cross-sectional areas of the third and fourth fluid ports 44, 46 and the corresponding inlet flow channel 48 are smaller. Furthermore, the third and fourth fluid ports 44, 46 are spaced apart along cylindrical sections passing through the center of each of the third and fourth fluid ports 44, 46. The cylindrical sections surround the stud 36 and are concentric with the cross-section of the outlet flow channel 50. Moreover, the cylindrical sections have a first diameter d1, and the outlet flow channel 50 has a second diameter d2 smaller than the first diameter d1. With this configuration, the inlet flow channel 48 is arranged radially outward relative to the outlet flow channel 50. In the illustrated embodiment, the outlet flow channel 50 is parallel to the inlet flow channel 48, and both the outlet flow channel 48 and the inlet flow channel 50 are parallel to the longitudinal centerline 26. In some embodiments, the sum of the cross-sectional areas of the inlet flow channels 48 is less than or equal to the flow rate of the canister filter 10 configured to connect to the first connection structure.

[0043] The filter adapter 20 includes auxiliary ports 62 that open along corresponding planar surfaces of the tool receiving portion 56. In the illustrated embodiment, the filter adapter 20 includes two auxiliary ports 62 located on opposite sides of the longitudinal centerline 26. However, it should be understood that the filter adapter 20 may include more than two auxiliary ports 62. In the illustrated embodiment where the tool receiving portion 56 has six sides, the filter adapter 20 may include up to six auxiliary ports 62. Each auxiliary port 62 is connected via an auxiliary channel 64 to a corresponding inlet flow channel 48. In the illustrated embodiment, each auxiliary channel 64 extends radially to be perpendicular to the corresponding inlet flow channel 48. In some embodiments, the auxiliary ports 62 may be threaded. In some embodiments, the threads may conform to industry standards, thereby allowing various different devices to be connected to the filter adapter 20 using the auxiliary ports 62.

[0044] refer to Figure 10 and 11 Each auxiliary port 62 can initially be plugged with an industry-standard plug 94. Removing the plug 94 from the corresponding port 62 allows loop monitoring devices or fluid collection devices (collectively referred to herein as devices 96) to be introduced into the auxiliary port 62. One or more auxiliary ports 62 can be used immediately or after commissioning without removing the filter adapter 20 from the hydraulic manifold block 2 or performing additional machining.

[0045] The hydraulic manifold block 2 may include a predefined cavity 3. The cavity 3 may be machined into the hydraulic manifold block 2 along the bore axis 6. The sides of the cavity 3 may include internal threads 8 for forming a connection with the filter adapter 20. The cavity 3 may be manufactured to match a specific size and type (e.g., UNF or metric) of the adapter 20. For example, the cavity internal threads 8 may be manufactured to adapt to the shape and size of the adapter's second connection structure (e.g., second thread) 54. Similarly, the shape and size of the lower sealing surface of the cavity may be manufactured to adapt to the shape and size of the adapter's second end 24, which includes the second seal 92.

[0046] Cavity 3 can be connected to a passage within hydraulic manifold block 2. For example, cavity 3 can be associated with two manifold block passages, including a block inlet passage 4 open on the side of cavity 3 and a block outlet passage 5 open at the bottom of cavity 3. Block inlet passage 4 is positioned perpendicular to the cavity bore axis 6 and directs fluid into a sealing region 80 between the first seal 90 and the second seal 92. The dimensions of the block inlet and outlet passages 4, 5 can vary based on the expected fluid flow rate; however, they vary within the scope and safety practices of machining the manifold and ensuring the integrity of the first and second seals 90, 92.

[0047] In use, the filter adapter 20 is inserted into the cavity 3, threaded onto the internal thread 8, and tightened with a wrench applied to the tool receiving portion 56. Specifically, the adapter 20 is secured to a specified torque via the integrated tool receiving portion 56. The canister filter 10 is then mounted on the adapter 20 by screwing the canister's internal thread 14 onto the external thread 52 of the adapter stud 36. The filter canister 10 is screwed onto the adapter stud 36 until a positive seal is formed between the canister filter gasket 16 and the filter-facing surface 33 of the adapter mounting flange 30.

[0048] refer to Figure 7-11 The filter adapter 20 can be manufactured in several different sizes to fit a variety of industry standard (spin-on) filters, including SAE and metric. Different sizes of filter adapters may include structural variations. For example, the above regarding... Figure 1 , 2 The filter adapter 20 described in 4-6 can be adapted for use with a relatively small canister filter 10. An alternative embodiment, filter adapter 120, can be adapted for use with a relatively large filter canister 110. Despite its larger size, the filter adapter 120 used with the relatively large filter canister 110 is similar in shape and construction to the one described above. Figure 1 , 2 Similar to the filter adapter 20 described in 4-6, and using common reference numerals to refer to common elements.

[0049] The filter adapter 120 used with the relatively large filter canister 110 differs from the previously described filter adapter 20 in that the diameter of the inlet and outlet flow channels 48, 50 of the filter adapter 120 is larger than that of the previously described filter adapter 20. Consequently, the diameters of the mounting flange 30, stud 36, intermediate portion 31 and insertion portion 132 of the filter adapter 120 are correspondingly larger, and the axial length of the insertion portion 132 of the filter adapter 120 is longer than that of the previously described filter adapter 20.

[0050] The filter adapter 120, used with the relatively large filter canister 110, differs from the previously described filter adapter 20 in that... Figure 7-9 The filter adapter 120 includes a greater number of inlet flow channels 48 than the previously described filter adapter 20. For example, in the illustrated embodiment, the filter adapter 120 includes sixteen inlet flow channels 48, two of which are in fluid communication with the auxiliary port 62.

[0051] Furthermore, the filter adapter 120 used with the relatively large filter canister 110 differs from the previously described filter adapter 20 in that the insertion portion 132 of the filter adapter 120 omits the enlarged diameter portion 39 and instead has a uniform outer diameter between the shoulder 35 and the second end 24 of the adapter.

[0052] Although the first connecting structure 52 and the second connecting structure 54 are described herein as threaded or helical threads, the first and second connecting structures 52, 54 are not limited to this structure. For example, in other embodiments, one or both of the first and second connecting structures 52, 54 may be different types of mechanical connections, such as bayonet connections, cam connections, or snap-fit ​​connections.

[0053] Selective illustrative embodiments of the adapter have been described in detail above. It should be understood that only structures deemed necessary to illustrate the adapter have been described herein. Other conventional structures, as well as the structures of auxiliary and accessory components of the hydraulic system, hydraulic manifold blocks, and adapters, are considered to be known and understood by those skilled in the art. Furthermore, while working examples of the adapter have been described above, the adapter is not limited to the working examples described above, but various design changes can be made without departing from the adapter described in the claims.

Claims

1. An adapter, comprising: First end; A stud protruding from the first end, the end face of the stud including a first fluid port; The second end is opposite to the first end, and the end face of the second end includes a second fluid port; as well as An outlet flow channel extending between the first fluid port and the second fluid port; The outer surface of the adapter includes The first connecting structure is provided on the stud. A second connection structure is disposed between the first connection structure and the second end. A tool receiving portion is disposed between the first connecting structure and the second connecting structure, the tool receiving portion having a polygonal cross-sectional shape. A first groove extending circumferentially is disposed between the tool receiving portion and the second connecting structure, and the first groove is configured to receive part of the first seal. A second groove extending circumferentially, the second groove being disposed between the end face of the second connection structure and the second end, the second groove being configured to receive part of the second seal; in, The adapter further includes: A third fluid port is disposed between the second connection structure and the second groove; A fourth fluid port is disposed between the first connection structure and the tool receiving portion; An inlet flow channel extending between the third fluid port and the fourth fluid port; An auxiliary port open on one side of the tool receiving section; and An auxiliary channel extending between the auxiliary port and the inlet flow channel.

2. The adapter of claim 1, wherein, The auxiliary channel is perpendicular to the inlet flow channel.

3. The adapter of claim 1, wherein, The outlet flow channel is coaxial with the longitudinal centerline of the adapter.

4. The adapter of claim 1, wherein, The inlet flow channel is arranged radially outward relative to the outlet flow channel.

5. The adapter of claim 1, wherein, The outlet flow channel is parallel to the inlet flow channel.

6. The adapter of claim 1, wherein, The inlet flow channel includes at least two inlet flow channels.

7. The adapter of claim 6, wherein, The sum of the combined cross-sectional areas of the at least two inlet flow channels is sufficient to accept the nominal flow rate of a filter that can be connected to the first connection structure.

8. The adapter of claim 6, wherein, The at least two inlet flow channels are spaced apart from each other along cylindrical sections surrounding the outlet flow channel, the cylindrical sections having a first diameter, and the outlet flow channel having a second diameter smaller than the first diameter.

9. The adapter of claim 8, wherein, The cylindrical section is concentric with the cross-section of the adapter, including the outlet flow channel.

10. The adapter of claim 1, comprising a tank mounting flange that projects radially relative to a longitudinal centerline of the adapter, the tank mounting flange disposed between the first connection structure and the tool receiving portion, and wherein, The fourth fluid port is open at the filter-facing surface of the tank mounting flange.

11. The adapter of claim 1, wherein, The cross-sectional shape of the polygon is hexagonal.

12. The adapter of claim 1, wherein, Both the first and second connection structures are external threads.

13. An adapter for connecting a canister filter to a hydraulic manifold block, the adapter comprising: First end; The second end, opposite to the first end; A longitudinal axis extending through the first end and the second end; A stud protruding from the first end, the stud being concentric with the longitudinal axis and having a first external thread, the shape and size of the first external thread being designed to engage with the internal thread of the canister filter; An external connection structure is disposed between the stud and the second end, and the shape and size of the external connection structure are designed to engage with the corresponding internal connection structure of the cavity of the hydraulic manifold block. A first groove extending circumferentially, the shape and size of the first groove being designed to receive a first annular seal, and the first groove being disposed between the stud and the external connection structure; A second groove extending circumferentially, the shape and size of the second groove being designed to receive a second annular seal, the second groove being disposed between the external connection structure and the second end, and a portion of the adapter disposed between the first groove and the second groove corresponding to the sealing area of ​​the adapter; A tool receiving portion is disposed between the first connecting structure and the first groove, the tool receiving portion having a polygonal cross-sectional shape; An outlet flow channel extending between the first end and the second end to pass through the sealing region without being in fluid communication with the sealing region; An inlet flow channel extending between the first end and the sealed area; An auxiliary port that is open on one side of the tool receiving section; as well as An auxiliary channel extending between the auxiliary port and the inlet flow channel.

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