Pneumatic stop valve

Abstract

A pneumatic shut-off valve may include a valve structure, a switch plate air path, and an internal check valve. In various aspects, the pneumatic shut-off valve may be connected to a valve positioner, an actuator, or a combination thereof to control operation of a fluid process control valve. In operation, the pneumatic shut-off valve acts when the actuator loses sufficient pressure or communication from the main air supply, stored pressurized air from the actuator reservoir and / or an external reservoir to place the actuator in a preset fail-safe position.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to U.S. Provisional Patent Application No. 62 / 890,331, entitled “Modified Pneumatic Valve,” filed on August 22, 2019. The contents of the aforementioned application are incorporated herein by reference in their entirety. Technical Field

[0003] The present disclosure relates to a pneumatic valve device, in particular to a pneumatic shut-off valve device that is in communication with and / or operatively coupled to a single-acting or double-acting actuator. The pneumatic shut-off valve can be used with a valve positioner to utilize an air reservoir to achieve a more accurate opening angle of the actuator, a higher torque output, and to fail-safe the actuator to a preset fail-safe position. Background Art

[0004] Control valves (e.g., rotary valves, linear valves, etc.) are used to control the flow of process fluids. Control valves have flow control members (e.g., balls, disks, plugs, etc.) to regulate the amount of fluid flow through the valve. Control valves typically include a pneumatic actuator and a positioner to automate the operation of the control valve. The operation of the pneumatic actuator can be controlled by a positioner that supplies air pressure to each side of the pneumatic actuator relative to an input signal, which in turn provides a force to throttle the flow control member between a fully open position and a fully closed position.

[0005] Typically, the control valve is implemented with a fail-safe system. During an emergency, when there is an interruption or loss of air supply, the actuator causes the control valve to move to a fully closed position or a fully open position. Known pneumatic actuator fail-safe systems include mechanical spring return systems or air-based fail-safe systems.

[0006] Air-based failsafe systems are typically implemented with a double-acting actuator paired with an air reservoir. When there is a distribution or loss of air supply in a typical installation, the shutoff valve will override the fluid communication between the positioner and the actuator and provide fluid communication between the first actuator piston chamber and the air reservoir. The shutoff valve also facilitates fluid communication between the second actuator piston chamber and the atmosphere, thereby causing the actuator to move toward the second actuator piston chamber. This can place the valve controlled by the actuator in a fully closed failsafe position or a fully open failsafe position.

[0007] However, unlike mechanical spring return failsafe systems that are manufactured to be packaged integrally with the actuator, air-based failsafe systems are often specially configured and involve complex layouts and piping to integrate the necessary and usually separate components, such as shut-off valves, switch valves, check valves, air reservoirs, various fittings, and additional piping to integrate the components. These systems thus significantly increase the size, complexity, and cost of many pneumatic actuator failsafe systems. Summary of the invention

[0008] The present disclosure generally relates to an improved pneumatic valve having multiple ports. In one aspect, the pneumatic valve includes ports AF and additional ports 1 and 2. Ports A, B, C, D, E, F, 1, and 2 are provided on the side of the valve structure. Ports B and E are coupled to the actuator air supply ports. Port F is coupled to the actuator air reservoir port. Ports A and D receive air supply from a positioner. Port C vents to atmosphere.

[0009] The disclosed valve structure defines a valve core chamber, a first internal air path, and a second internal air path. In one aspect, the valve core chamber and the internal air path may be arranged along the axis of the valve structure. On the other hand, the first internal air path and the second internal air path are collinear. Alternatively, the valve core and the internal air path may be configured in other linear or non-linear orientations. The first internal air path provides fluid communication between port 1 and optional port 2. Port 1 is connected to the main air supply, and port 2 is connected to the positioner supply port. The second internal air path provides fluid communication to port F. In one aspect, an internal check valve is arranged between the first internal air path and the second internal air path to allow fluid communication between the first internal air path and the second internal air path only when the air pressure in the first internal air path is greater than the air pressure in the second internal air path.

[0010] The spool system is mounted in the spool chamber and is loaded against a spring. The valve structure is provided with a switch plate on one side, which contains a switch plate air path to allow fluid communication between the spool chamber and port 1.

[0011] In one example, when the spring in the valve core system is in a compressed first state, port A is in fluid communication with port B, port B is blocked from port C, port D is in fluid communication with port E, and port E is blocked from port F. When the spring in the valve core system is in a decompressed second state, port A, port B, and port C are in fluid communication, port D is blocked from port E, and port E is in fluid communication with port F.

[0012] In another example, when the spring in the valve core system is in a compressed first state, port A is in fluid communication with port B, port B is blocked between port C, port D is in fluid communication with port E, and port E is blocked between port F. When the spring in the valve core system is in a decompressed second state, port A is blocked between port B, port B is in fluid communication with port C, port D is blocked between port E, and port E is in fluid communication with port F.

[0013] In another example, when the spring in the valve core system is in a compressed first state, port A is in fluid communication with port B, port B is blocked from port C, port D is in fluid communication with port E, and port E is blocked from port F. When the spring in the valve core system is in a decompressed second state, port A, port B, and port C are in fluid communication, and port D, port E, and port E are in fluid communication.

[0014] In another example, when the spring in the valve core system is in a compressed first state, port A is in fluid communication with port B, port B is blocked from port C, port D is in fluid communication with port E, and port E is blocked from port F. When the spring in the valve core system is in a decompressed second state, port A is blocked from port B, port B is in fluid communication with port C, and port D, port E, and port F are in fluid communication.

[0015] The foregoing and other objects, features, and advantages of the disclosed subject matter will become apparent from the following detailed description taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a perspective view of a pneumatic shut-off valve according to one aspect.

[0017] Figure 2 Based on one aspect Figure 1 Exploded diagram of a pneumatic shut-off valve.

[0018] Figure 3 Based on one aspect Figure 1 Exploded rear view of the components of a pneumatic shut-off valve and their internal paths.

[0019] Figure 4 Based on one aspect Figure 1 An exploded front view of the components of a pneumatic shut-off valve and their internal paths.

[0020] Figure 5 is a perspective view of a pneumatic shut-off valve in a typical arrangement with an actuator, an air supply, and a positioner according to one aspect.

[0021] Figure 6 is a three-dimensional perspective view of an exemplary actuator.

[0022] Figure 7 is a perspective view of a pneumatic shut-off valve according to another aspect.

[0023] Figure 8 is a perspective view of a pneumatic shut-off valve in a typical arrangement with an actuator, an air supply, a separate air reservoir, and a positioner according to one aspect.

[0024] Fig. 9 is a fail-safe due to loss of adequate air supply as viewed along line 7-7 according to one aspect Figure 1 Partial cross-sectional view of a pneumatic shut-off valve.

[0025] Fig.10 is a schematic diagram of a pneumatic shut-off valve in a fail-safe state due to loss of adequate air supply, shown in cross-sectional view along line 6-6 according to one aspect, the pneumatic shut-off valve being Figure 6 The actuator is connected.

[0026] Fig.11 is in normal operation according to one aspect viewed along line 7-7 Figure 1 Partial cross-sectional view of a pneumatic shut-off valve.

[0027] Fig.12 is a schematic diagram of a pneumatic shut-off valve in normal operation shown in cross-sectional view along line 6-6 according to one aspect, the pneumatic shut-off valve being Figure 6 The actuator is connected.

[0028] Fig.13 is a perspective view of a pneumatic shut-off valve according to one aspect.

[0029] Fig.14 is a diagram showing internal component paths according to one aspect Fig.13 Front perspective view of a pneumatic shut-off valve.

[0030] Fig.15 is a diagram showing internal component paths according to one aspect Fig.13 Rear perspective view of a pneumatic shut-off valve.

[0031] Fig.16 is a fail-safe due to loss of adequate air supply as viewed along line 8-8 according to one aspect Figures 13 to 15 Partial cross-sectional view of a pneumatic shut-off valve.

[0032] Fig.17 is a fail-safe due to loss of adequate air supply as viewed along line 9-9 according to one aspect Figures 13 to 15 Partial cross-sectional view of a pneumatic shut-off valve.

[0033] Fig.18 A cross-sectional view of a fail-safe due to loss of adequate air supply is shown along line 6-6 according to one aspect. Figures 13 to 15 as well as Figure 29 to Figure 30 Schematic diagram of a pneumatic shut-off valve, the pneumatic shut-off valve and Figure 6 The actuator is connected.

[0034] Fig.19 is in normal operation as viewed along line 8-8 according to one aspect Figures 13 to 15 Partial cross-sectional view of a pneumatic shut-off valve.

[0035] Fig. 20 is in normal operation according to one aspect viewed along line 9-9 Figures 13 to 15 Partial cross-sectional view of a pneumatic shut-off valve.

[0036] Fig.21 is a schematic diagram of a pneumatic shut-off valve in normal operation shown in cross-sectional view along line 6-6 according to one aspect, the pneumatic shut-off valve being Figure 6 The actuator is connected.

[0037] Fig. 22 is a diagram showing an internal component path similar to Fig.13 A front perspective view of a pneumatic shut-off valve with the external three-way valve port omitted.

[0038] Fig.23 is a diagram showing an internal component path similar to Fig.13 A rear perspective view of a pneumatic shut-off valve with the external three-way valve port omitted.

[0039] Fig.24 According to one aspect Fig.13 The fail-safe condition due to loss of adequate air supply is shown in FIG. 8 as viewed along line 8-8. Figure 22 to Figure 23 Partial cross-sectional view of a pneumatic shut-off valve.

[0040] Fig.25 According to one aspect Fig.13 The fail-safe condition due to loss of adequate air supply is shown in FIG. 9 as viewed along line 9-9. Figure 22 to Figure 23 Partial cross-sectional view of a pneumatic shut-off valve.

[0041] Fig.26 A cross-sectional view of a fail-safe due to loss of adequate air supply is shown along line 6-6 according to one aspect. Figure 22 to Figure 23 Schematic diagram of a pneumatic shut-off valve, the pneumatic shut-off valve and Figure 6 The actuator is connected.

[0042] Fig. 27 According to one aspect Fig.13 The normal operation is shown in FIG. 8 as viewed along line 8-8. Figure 22 to Figure 23 Partial cross-sectional view of a pneumatic shut-off valve.

[0043] Fig.28 According to one aspect Fig.13 The normal operation is shown in FIG. 1 as viewed along line 9-9. Figure 22 to Figure 23 Partial cross-sectional view of a pneumatic shut-off valve.

[0044] Fig.29 is a diagram showing an internal component path similar to Fig.13 0026] A front perspective view of a pneumatic shut-off valve of FIG. 1, wherein port A is formed in the side of the valve structure.

[0045] Fig.30 is a diagram showing an internal component path similar to Fig.13 A rear perspective view of a pneumatic shut-off valve of FIG. 1 , wherein port A is formed in the side of the valve structure.

[0046] Fig.31 According to one aspect Fig.13 The fail-safe condition due to loss of adequate air supply is shown in FIG. 8 as viewed along line 8-8. Figure 29 to Figure 30 Partial cross-sectional view of a pneumatic shut-off valve.

[0047] Fig.32 According to one aspect Fig.13 The fail-safe condition due to loss of adequate air supply is shown in FIG. 8 as viewed along line 8-8. Figure 29 to Figure 30 Partial cross-sectional view of a pneumatic shut-off valve.

[0048] Fig.33 According to one aspect Fig.13 The normal operation is shown in FIG. 8 as viewed along line 8-8. Figure 29 to Figure 30 Partial cross-sectional view of a pneumatic shut-off valve.

[0049] Fig.34 According to one aspect Fig.13 The normal operation is shown in FIG. 1 as viewed along line 9-9. Figure 29 to Figure 30 Partial cross-sectional view of a pneumatic shut-off valve.

[0050] Fig.35 is a diagram illustrating the combinations of port connections and communications that may be facilitated by various aspects of the pneumatic shut-off valve. DETAILED DESCRIPTION

[0051] The present disclosure generally relates to a pneumatic shut-off valve having multiple ports that can be used with an actuator, either alone or in conjunction with a positioner, to place a control valve in a fail-safe configuration in response to a loss of air supply or when the air pressure supplied to the shut-off valve 1 fails below a minimum threshold. In various aspects, the minimum threshold for air supply is in the range of 0-150 psi. The minimum threshold can be selected or altered by a user of the disclosed apparatus and system. In various aspects, the pneumatic shut-off valve can include an external three-way valve.

[0052] exist Figure 1 , Figure 7 , Fig.13 , Figure 22 to Figure 23 as well as Figure 29 to Figure 30 Various aspects of the improved pneumatic valve 1 are shown in FIG. 1 . In one aspect, the pneumatic shut-off valve 1 includes a valve structure 10, a base plate 18 and a switch plate 20 and an external three-way valve 30. As shown, the valve structure 10 can be connected to the switch plate 20 and the external three-way valve 30.

[0053] like Figures 2 to 4 As shown in , the valve structure 10 defines a valve core chamber 11 and includes a port A 13 in the top portion of the valve structure and a port E connection 14 in the bottom portion of the valve structure. In various aspects, port A and port E are aligned axially, while in other aspects, port A and port E are not aligned axially. The valve core chamber 11 receives a valve core assembly 12, which includes a valve core 121 and a valve core sleeve 122, and a spring 125 disposed at the bottom portion of the valve core assembly. The valve structure 10 also defines a first internal air path 15 and a second internal air path 16. The valve structure 10 also includes an internal check valve 151, which allows one-way flow between the first internal air path 15 and the second internal air path 16 when the air pressure in the first internal air path 15 is greater than the second internal air path 16. In various aspects, the check valve 151 can be disposed in the first internal air path 15, the second internal air path 16, or between the first internal air path and the second internal air path.

[0054] In one aspect, the side of the valve structure 10 includes a plurality of additional ports, including port 1171, port 2172, port F 173, port B 174, port E 175, external three-way valve port 176, port 3 177, and port C 191. In one aspect, port A 13 is fluidly connected to port B 174, and port E connection 14 is fluidly connected to port E 175. The first internal air path 15 is fluidly connected to port 1171 and can be connected to the optional port 2172. The second internal air path 16 is in fluid communication with port F 173, external air reservoir port 178, and first spool inlet 1731. The first spool inlet 1731 is connected to the spool chamber 11, and the spool chamber 11 is simultaneously connected to the valve structure external three-way valve port 176, port 3 177, port C 191, and the second spool inlet 19. The second spool inlet 19 fluidly connects port A 13 and the spool chamber 11. The end of the second valve core inlet 19 is provided with a sealing mechanism 22, such as Fig.11 and Fig.19 171, to prevent air from flowing out through the valve structure 10. In various aspects, it is desirable to place the internal check valve 151 in an internal air path formed by the first internal air path 15 and the second internal air path 16 upstream or in front of any of the following: the first valve core inlet 1731, port F 173, or the external air reservoir port 178 intersecting the second internal air path 16. Alternatively, it is desirable to place the internal check valve 151 in an internal air path formed by the first internal air path 15 and the second internal air path 16 downstream or after the port 1171. Although described in the presence of an optional port 2, in various aspects, the shut-off valve 1 omits port 2. In these aspects, the shut-off valve 1 is not in fluid communication with the positioner supply port. Instead, a T-fitting is installed between port 1171 and the main air supply 60, and the remaining ports on the T-fitting are in fluid communication with the positioner supply port.

[0055] The valve core 121 is recessed to form a plurality of valve core recesses 1211, and a first spacer 1214 is formed between each of the valve core recesses 1211. The valve core sleeve 122 is coupled to the top of the valve core 121. The valve core 121 also includes a plurality of lip seals 123, which include (but are not limited to) O-rings or other elastic structures. The valve core 121 also includes a spacer 124 separated by a second spacer b 1215. The valve core recess 1211 includes a first valve core recess 1212 and a second valve core recess 1213. As shown, the spacer 124 includes a first spacer 1241, a second spacer 1242, a third spacer 1243, a fourth spacer 1244, a fifth spacer 1245, and a sixth spacer 1246. As used herein, spacer 124 , including spacers 1241 - 1246 , defines an opening in valve core 121 that permits fluid communication through a portion of the valve core.

[0056] In operation, the first valve core recess 1212 can translate between the first spacer 1241, the second spacer 1242, and the third spacer 1243, thereby allowing a first state fluid communication between the first spacer 1241 and the second spacer 1242, or a second state fluid communication between the second spacer 1242 and the third spacer 1243. Similarly, the second valve core recess 1213 is displaced between the fourth spacer 1244, the fifth spacer 1245, and the sixth spacer 1246, thereby allowing a first state fluid communication between the fourth spacer 1244 and the fifth spacer 1245, or a second state fluid communication between the fifth spacer 1245 and the sixth spacer 1246.

[0057] In various aspects, the valve structure 10 includes an external air reservoir port 178 on the side. The external air reservoir port 178 can be plugged when not in use. The external air reservoir port 178 is fluidly connected to the second internal air path 16. The external air reservoir port 178 can be connected to an external air reservoir 1781, such as Figure 8 and Fig.10 as shown in .

[0058] like Figure 3 and Figure 4 As shown in FIG. 1 , a switch plate air path 21 is defined within the switch plate 20 . An end of the switch plate air path 21 allows fluid communication between the first internal air path 15 and the valve core chamber 11 .

[0059] The external three-way valve 30 has a three-way passage 31 inside, and the ends of the three-way passage 31 are respectively provided with a port D32, an external three-way valve first port 33, and an external three-way valve second port 34. The first conduit 41 includes a member for connecting the external three-way valve first port 33 with the port E connection 14. The second conduit 42 is a member for connecting the external three-way valve second port 34 with the valve structure external three-way valve port 176. In addition, as in Fig.14 and Fig. 22 As seen in FIG. 1 , the first valve core inlet 1731 can be blocked by the sealing mechanism 23 so that air cannot escape the valve structure 10 . In other aspects, the external three-way valve 30 is omitted, and each of the ports AF terminates directly or indirectly to the valve core chamber 11 .

[0060] like Figure 5 , an exemplary deployment in which the pneumatic shut-off valve 1 combines an actuator 50, a main air supply source 60, and a positioner 70. In this example, the external three-way valve 30 is combined with the valve structure 10 through a first conduit 41 and a second conduit 42. In one aspect, the actuator 50 may include an actuator IB port 51, an actuator IC port 52, and an actuator ID port 53. Port F 173 is fluidly connected to the actuator IB port 51, port B 174 is fluidly connected to the actuator IC port 52, and port E 175 is fluidly connected to the actuator ID port 53. In other aspects, many actuators do not include the actuator IB port 51. In this aspect, port F 173 can be blocked by a plug 1782, and an external air reservoir 1781 can be connected to the air reservoir port 178 by a tube. Therefore, the pneumatic shut-off valve 1 is suitable for use with a wide variety of actuators, including but not limited to rotary actuators, linear actuators, actuators with two or more piston chambers, actuators with onboard air reservoirs, and actuators without onboard air reservoirs. Likewise, the pneumatic shut-off valve 1 is suitable for use with a wide variety of positioners. In addition, the pneumatic shut-off valve 1 can be incorporated into a system having one or more existing shut-off valves.

[0061] View now Figure 5 , Figure 6 , Fig.10 , Fig.12 , Fig.18 , Fig.21 and Fig.26 , shows an example of an actuator 50 for operating a control valve. The actuator 50 has one or more actuator pistons 54, an actuator lever arm 55, a first actuator piston chamber 501, a second actuator piston chamber 502, and optionally, an actuator air reservoir 503. As previously described, the pneumatic shut-off valve 1 can be used with single-acting or double-acting actuators, including actuators without an onboard air reservoir.

[0062] In the example shown, supplying air to the first actuator piston chamber 501 causes the actuator piston 54 to move away from an initial set point, while supplying air to the second actuator piston chamber 502 causes the actuator piston 54 to move toward the initial set point. In one example, the actuator piston 54 may be in communication with an actuator lever arm 55, which is further in operative communication with a control valve. In many actuators, the air reservoir 503, the first actuator piston chamber 501, and the second actuator piston chamber 502 are independent of each other. As shown, the actuator air reservoir 503 is fluidly connected to the actuator IB port 51, the first actuator piston chamber 501 is fluidly connected to the actuator IC port 52, and the second actuator piston chamber 502 is fluidly connected to the actuator ID port 53.

[0063] The pneumatic shut-off valve 1 may assume a variety of operating configurations to achieve a desired fail-safe condition for the associated control valve. These operating configurations may be implemented when a fluid flow control system employing the pneumatic shut-off valve 1 experiences a loss of air supply to the pneumatic shut-off valve from a main air supply or from a main air supply delivered through one or more of an actuator or positioner.

[0064] Example 1: Loss of air supply: ABC, DxE-F and return of air supply A-BxC, D-ExF

[0065] View now Figures 1 to 5 as well as Figures 7 to 12 The pneumatic shut-off valve 1 assumes this operating configuration when there is not sufficient air pressure supplied from the main air supply 60 via the switch plate air path 21 to the valve core chamber 11 to overcome the spring 125, as shown in FIG. Figure 2 , Fig. 9 and Fig.10 . Thus, the spring 125 urges the valve core 121 upward, thereby positioning the first valve core recess 1212 to allow fluid communication between the first spacer 1241 and the second spacer 1242. Likewise, the second valve core recess 1213 is positioned to allow fluid communication between the fourth spacer 1244 and the fifth spacer 1245. Port A13 of valve 1 is in fluid communication with the first outlet port 71 of the positioner 70, and port B 174 is in fluid communication with the actuator IC port 52. Port C 191 is in fluid communication with the atmosphere, and port D 32 is in fluid communication with the second outlet port 72 of the positioner 70. Port E 175 is in fluid communication with the actuator ID port 53, port F 173 is in fluid communication with the actuator IB port 51, and port 3177 is in fluid communication with the atmosphere.

[0066] In this example, both port A 13 and port B 174 are in fluid communication with the first spacer 1241, while port C 191 is in fluid communication with the second spacer 1242. This causes the first actuator piston chamber 501 to vent to atmosphere through the actuator IC port 52 which is in fluid communication with port B 174 and port C 191.

[0067] In addition, port F 173 and the first spool inlet 1731 are in fluid communication with the fourth spacer 1244, the valve structure external three-way valve port 176 is in fluid communication with the fifth spacer 1245, and port 3177 is in fluid communication with the sixth spacer 1246. The actuator air reservoir 503 is in fluid communication with the actuator IB port 51, port F 173, and the first spool inlet 1731. With this configuration, the first spool inlet 1731 has a higher air pressure than port D 32, thereby causing the reversing valve in the external three-way valve 30 to move toward port D 32, thereby providing fluid communication between port E 175 and port F 173. Therefore, the stored air in the actuator air reservoir 503 is in fluid communication with the second actuator piston chamber 502, thereby causing the actuator piston 54 to move to the set point, as shown in FIG. Fig.10 as shown in .

[0068] View now Figure 2 , Fig.11 and Fig.12 , when there is sufficient pressure from the main air supply 60 via the switch plate air path 21 to overcome the spring 125 and move the valve core 121 downward. This translation of the valve core 121 causes the first valve core recess 1212 to permit fluid communication between the second spacer 1242 and the third spacer 1243, and the second valve core recess 1213 to permit fluid communication between the fifth spacer 1245 and the sixth spacer 1246.

[0069] Additionally, both port A 13 and port B 174 are in fluid communication with the first spacer 1241, while port C 191 is in fluid communication with the second spacer 1242. This allows the first actuator piston chamber 501 to receive air through the actuator IC port 52 which is in fluid communication with port B 174 and port A 13.

[0070] In this configuration, port F 173 and the first spool inlet 1731 are in fluid communication with the fourth spacer 1244, the external three-way valve port 176 is in fluid communication with the fifth spacer 1245, and port 3177 is in fluid communication with the sixth spacer. When the air pressure at port 1171 is greater than the pressure within the actuator air reservoir 503, the internal check valve 151 allows the actuator air reservoir 503 to be charged through port 1171. The fourth spacer 1244 is in fluid communication with the first spool inlet 1731 and ultimately with port F 173, so the first spool inlet 1731 keeps the actuator air reservoir 503 independent. Port D 32 has a higher air pressure than port 3177, causing the reversing valve in the external three-way valve 30 to move toward the external three-way valve port two 34, thereby creating fluid communication between port D32, port E 175, and the second actuator piston chamber 502.

[0071] Example 2: Loss of air supply: ABC, DxE-F with return of air supply A-BxC, D-ExF

[0072] refer to Figures 13 to 17 , Fig.19 and Fig. 20 , another aspect of the pneumatic shut-off valve 1 does not include the external three-way valve 30. Figures 14 to 17 , Fig.19 and Fig. 20 As shown in the valve structure, the external three-way valve port 176 and the port E connection 14 are plugged. The valve 1 includes a through hole from the port E 175 to the fifth spacer 1245. In this regard, the port 3177 plays the same role as the port D32 of the external three-way valve 30.

[0073] The pneumatic shut-off valve 1 assumes this operating configuration when there is not sufficient air pressure supplied from the main air supply 60 via the switch plate air path to the spool chamber 11 to overcome the spring 125, as shown in FIG. Figures 16 to 18 Thus, the spring 125 pushes the valve core 121 upward, thereby positioning the first valve core recess 1212 to allow fluid communication between the first spacer 1241 and the second spacer 1242 , and positioning the second valve core recess 1213 to allow fluid communication between the fourth spacer 1244 and the fifth spacer 1245 .

[0074] As shown, port A 13 is in fluid communication with the positioner 70 first outlet port 71, and port B 174 is in fluid communication with the actuator IC port 52. Port C 191 is in fluid communication with the atmosphere, and port D 32 (rather than the omitted 3-way valve port 3177) is in fluid communication with the positioner 70 second outlet port 72. Port E 175 is in fluid communication with the actuator ID port 53, and port F 173 is in fluid communication with the actuator IB port 51. Port A 13 and port B 174 are both in fluid communication with the first spacer 1241; while port C 191 is in fluid communication with the second spacer 1242, resulting in the first actuator piston chamber 501 being vented to the atmosphere through the actuator IC port 52, which is in fluid communication with ports B 174 and C 191.

[0075] In this example, port D 32 is in fluid communication with the sixth spacer 1246, port E 175 is in fluid communication with the fifth spacer 1245, and port F 173 and the first spool inlet 1731 are in fluid communication with the fourth spacer 1244. This arrangement results in the actuator reservoir 503 being in fluid communication with the actuator IB port 51, port F 173, the first spool inlet 1731, port E 175, the actuator ID port 53, and the second actuator piston chamber 502. Thus, the air supply from the actuator reservoir 503 acts on the second actuator piston chamber 502, thereby causing the actuator piston 54 to move to the set point, as shown in FIG. Fig.18 In the description.

[0076] refer to Figures 19 to 21 , when there is sufficient pressure from the main air supply 60 to the switch plate air path 21 to overcome the upward bias of the spring 125, the valve core 121 translates downward. Thus, the first valve core recess 1212 is positioned to allow fluid communication between the second spacer 1242 and the third spacer 1243. Likewise, the second valve core recess 1213 is positioned to allow fluid communication between the fifth spacer 1245 and the sixth spacer 1246.

[0077] In this example, both port A 13 and port B 174 are in fluid communication with the first spacer 1241, while port C 191 is in fluid communication with the second spacer 1242. This results in the first actuator piston chamber 501 receiving air through the actuator IC port 52 which is also in fluid communication with port B 174 and port A 13.

[0078] In this example, port D 32 (rather than the omitted 3-way valve port 3177) is in fluid communication with the sixth spacer 1246, and port E 175 is in fluid communication with the fifth spacer 1245. At the same time, port F 173 and the first spool inlet 1731 are in fluid communication with the fourth spacer 1244, resulting in the second actuator piston chamber 502 being in fluid communication with the actuator ID port 53, port E 175, and port D 32. When the air pressure at port one 171 is greater than the air pressure of the actuator reservoir 503, the internal check valve 151 allows the actuator reservoir 503 to be charged through port 1171. Therefore, the fourth spacer 1244 in fluid communication with port F 173 keeps the actuator reservoir 503 independent.

[0079] Example 3: Loss of air: AxB-C, DxE-F – Air return: A-BxC, D-ExF

[0080] View now Figure 22 to Figure 25 , Fig. 27 and Fig.28 , which illustrates another aspect of the pneumatic shut-off valve 1 that does not include the external three-way valve 30. In this aspect, the external three-way valve port 176 and the port E connection 14 can be removed or plugged. Port D 32 is synonymous with port 3177 and is provided on the side of the valve structure 10 with a through hole to the sixth spacer 1246. Port E 175 is provided with a through hole to the fifth spacer 1245. Port A 13 is provided on the side of the valve structure 10 with a through hole to the third spacer 1243. Port B 174 is provided with a through hole to the second spacer 1242. Port C 191 is provided with a through hole to the first spacer 1241.

[0081] When there is not enough pressure from the main air supply 60 via the switch plate air path 21 to overcome the force of the spring 125, the valve core 121 is biased upward, such as Figure 24 to Figure 26 . This results in the first valve core recess 1212 being positioned to allow fluid communication between the first spacer 1241 and the second spacer 1242, and the second valve core recess 1213 being positioned to allow fluid communication between the fourth spacer 1244 and the fifth spacer 1245. In this configuration, port A 13 is in fluid communication with the first outlet port 71 of the positioner 70, port B 174 is in fluid communication with the actuator IC port 52, and port C 191 is in fluid communication with the atmosphere. Port D32 is in fluid communication with the second outlet port 72 of the positioner 70, port E 175 is in fluid communication with the actuator ID port 53, and port F 173 is in fluid communication with the actuator IB port 51.

[0082] In this example, port A13 is also in fluid communication with the third spacer 1243, port B174 is also in fluid communication with the second spacer 1242, and port C191 is also in fluid communication with the first spacer 1241. Thus, the first actuator piston chamber 501 is vented to atmosphere through the actuator IC port 52 which is also in fluid communication with ports B174 and C191.

[0083] Additionally, port D 175 is in fluid communication with the sixth spacer 1246, port E 175 is in fluid communication with the fifth spacer 1245, and port F 173 and the first spool inlet 1731 are in fluid communication with the fourth spacer 1244. This places the actuator reservoir 503 in fluid communication with the actuator IB port 51, port F 173, the first spool inlet 1731, port E 175, the actuator ID port 53, and the second actuator piston chamber 502. In this regard, the air supply received from the actuator reservoir 503 in the second actuator piston chamber 502 causes the actuator piston 54 to move to the fail-safe set point.

[0084] Combination Figure 2 See also Fig.21 , Fig. 27 and Fig.28 When there is sufficient pressure from the main air supply 60 via the switch plate air path 21 to overcome the force of the spring 125, the valve core 121 moves downward. This causes the first valve core recess 1212 to be positioned to allow fluid communication between the second spacer 1242 and the third spacer 1243, and causes the second valve core recess 1213 to be positioned to allow fluid communication between the fifth spacer 1245 and the sixth spacer 1246.

[0085] In this example, port A13 is also in fluid communication with the third spacer 1243, port B174 is also in fluid communication with the second spacer 1242, and port C191 is also in fluid communication with the first spacer 1241. Thus, the first actuator piston chamber 501 is in fluid communication with the actuator IC port 52, port B 174, and port A13.

[0086] In addition, port D 175 is also in fluid communication with the sixth spacer 1246, port E 175 is also in fluid communication with the fifth spacer 1245, and port F 173 and the first spool inlet 1731 are also in fluid communication with the fourth spacer 1244. This arrangement allows the second actuator piston chamber 502 to be in fluid communication with the actuator ID port 53, port E 175, and port D 175. When the air pressure at port 1171 is greater than the actuator reservoir 503, the internal check valve 151 allows the actuator reservoir 503 to be charged through port 1171. The fourth spacer 1244 in fluid communication with port F 173 allows the actuator reservoir 503 to remain independent.

[0087] Example 4: Air loss: ABC, DxE-F – Air return: A-BC, D-ExF

[0088] View now Figure 2 , Fig.18 as well as Figures 29 to 34 .like Fig.18 , Fig.31 , Fig.32 and Figure 2 As shown in , when there is not enough pressure from the main air supply source 60 via the switch plate air path 21 to overcome the force of the spring 125, the valve core 121 is biased upward. Therefore, the first valve core recess 1212 is positioned to allow fluid communication between the first spacer 1241 and the second spacer 1242, and the second valve core recess 1213 is positioned to allow fluid communication between the fourth spacer 1244 and the fifth spacer 1245. Port A13 is in fluid communication with the first outlet port 71 of the positioner 70, port B 174 is in fluid communication with the actuator IC port 52, and port C191 is in fluid communication with the atmosphere. Port D is in fluid communication with the second outlet port 72 of the positioner 70, port E is in fluid communication with the actuator ID port 53, and port F is in fluid communication with the actuator IB port 51.

[0089] In this example, the pneumatic shut-off valve 1 does not include the external three-way valve 30. Thus, for example, the external three-way valve port 176 and the port E connection 14 are not formed in the valve structure 1, as shown in FIG. Figure 29 to Figure 30 or they may be plugged, as shown in Figure 15 to Figure 16 as shown in .

[0090] Port D 32 is provided on the side of the valve structure 10 with an elongated passage to the sixth spacer 1246. Port E 175 is provided with an elongated passage to the fifth spacer 1245. Port A 13 is provided on the side of the valve structure 10 with an elongated passage to the second spacer 1242. Port B 174 is provided with an elongated passage to the second spacer 1242, and port C 191 is provided with an elongated passage to the first spacer 1241.

[0091] In this example, both port A 13 and port B 174 are in fluid communication with the second spacer 1242, while port C 191 is in fluid communication with the first spacer 1241. Thus, the first actuator piston chamber 501 is vented to atmosphere through the actuator IC port 52 which is also in fluid communication with port B 174 and port C 191.

[0092] As shown, port D 175 is in fluid communication with the sixth spacer 1246, port E 175 is in fluid communication with the fifth spacer 1245, and port F 173 and the first spool inlet 1731 are in fluid communication with the fourth spacer 1244. This arrangement places the actuator reservoir 503 in fluid communication with the actuator IB port 51, port F 173, the first spool inlet 1731, port E 175, the actuator ID port 53, and the second actuator piston chamber 502. Thus, receiving a supply of air from the actuator reservoir 503 in the second actuator piston chamber 502 causes the actuator piston 54 to move to a set point.

[0093] refer to Figure 2 , Fig.21 , Fig.33 and Fig.34 When there is sufficient pressure from the main air supply 60 via the switch plate air path 21 to overcome the upward force of the spring 125, the valve core 121 translates downward. Thus, the first valve core recess 1212 is positioned to allow fluid communication between the second spacer 1242 and the third spacer 1243, and the second valve core recess 1213 is positioned to allow fluid communication between the fifth spacer 1245 and the sixth spacer 1246.

[0094] In this example, port A 13 and port B 174 are also in fluid communication with the second spacer 1242, and port C 191 is also in fluid communication with the first spacer 1241, so that the first actuator piston chamber 501 is in fluid communication with the actuator IC port 52, port B 174, and port A 13. In addition, port D 32 is also in fluid communication with the sixth spacer 1246, port E 175 is also in fluid communication with the fifth spacer 1245, and port F 173 and the first spool inlet 1731 are also in fluid communication with the fourth spacer 1244. Therefore, the second actuator piston chamber 502 is in fluid communication with the actuator ID port 53, port E 175, and port D 175. When the air pressure of port one is greater than the air pressure of the actuator reservoir 503, the internal check valve 151 allows the actuator reservoir 503 to be charged through port 1171. The fourth spacer 1244 is in fluid communication with port F 173 to keep the actuator reservoir 503 independent.

[0095] Example 5: Loss of Air: FED

[0096] In another aspect, port D 32, port E 175, first valve core inlet 1731, and port F 173 are defined by the valve structure 10 in a different configuration. In this aspect, port D 32, port E 175 may be placed in fluid communication with the fifth spacer 1245, while port F 173 and first valve core inlet 1731 may be placed in fluid communication with the fourth spacer 1244. Alternatively, port D 32, port E 175 may be placed in fluid communication with the fourth spacer 1244, while port F 173 and first valve core inlet 1731 may be placed in fluid communication with the fifth spacer 1245.

[0097] exist Fig.35 Additional exemplary combinations 2000 - 2010 of fluid communications that may be formed between ports AF and the internal air path of valve structure 10 are shown in FIG. Fig.35 Example combinations 2000-2003 of four different configurations of the pneumatic shut-off valve 1 are illustrated. Examples 2004-2010 individually illustrate example positioning and connection of a three-way valve. As shown in Example 2004, reference Figure 2 , when combined port AB may be in fluid communication with the second spacer 1242 and the third spacer 1243, the spring 125 is in a compressed configuration because the main air supply applies a force to the valve core to overcome the force of the spring. In this configuration, the shut-off valve 1 is in a normal operating configuration. Conversely, when port A is in fluid communication with port B, the pneumatic shut-off valve 1 may be configured to fluidly communicate combined port AB with port C through the first and second spacers 1241 and 1242, respectively, in a fail-safe operation. This occurs when the main air supply is insufficient to force the valve core downward to overcome the force of the spring 125. As a result, the valve core translates upward, communicating the combined port AB with port C.

[0098] Numerous examples and statements are provided herein to enhance the understanding of the present disclosure. A specific set of statements is provided below:

[0099] Statement 1. A pneumatic shut-off valve comprising: a valve body, the valve body further comprising: a first internal air path, the first internal air path being connected to a first port; a second internal air path, the second internal air path being connected to the first internal air path, wherein the first internal air path and the second internal air path are connected through a check valve fluid; a first three-way valve; and a second three-way valve; and wherein when an air supply is provided to the first port, the first three-way valve and the second three-way valve assume a normal operating configuration; and wherein the first three-way valve and the second three-way valve assume a fail-safe configuration in response to the air supply received at the first port being reduced to below a minimum threshold.

[0100] Statement 2. The pneumatic shut-off valve of Statement 1 wherein the first three-way valve comprises port A, port B, and port C, and the second three-way valve comprises port D, port E, and port F.

[0101] Statement 3. The pneumatic shut-off valve of Statement 2 wherein said port F is in fluid communication with said second internal air path.

[0102] Statement 4. The pneumatic shut-off valve of Statement 1 or 2 further comprising an external reservoir port.

[0103] Statement 5. The pneumatic shut-off valve of Statement 1 wherein said normal operating configuration includes providing fluid communication between said port A and said port B and fluid communication between said port D and said port E.

[0104] Statement 6. The pneumatic shut-off valve of Statement 1 wherein said fail-safe configuration comprises providing fluid communication between said port B and said port C.

[0105] Statement 7. The pneumatic shut-off valve of Statement 6 wherein said port B is also in fluid communication with said port A.

[0106] Statement 8. The pneumatic shut-off valve of Statement 1 wherein said fail-safe configuration comprises providing fluid communication between said port E and said port F.

[0107] Statement 9. The pneumatic shut-off valve of Statement 8 wherein said port E is also in fluid communication with said port D.

[0108] Statement 10. The pneumatic shut-off valve of Statement 1 wherein said first internal air path is in fluid communication with a main air supply.

[0109] Statement 11. The pneumatic shut-off valve of Statement 1 wherein said second internal air path is in fluid communication with a reservoir air supply.

[0110] Statement 12. The pneumatic shut-off valve of Statement 11 wherein said reservoir air supply is an onboard air reservoir integrated with said pneumatic shut-off valve.

[0111] Statement 13. The pneumatic shut-off valve of Statement 11 wherein said reservoir air supply is an onboard reservoir integrated with an actuator or positioner.

[0112] Statement 14. The pneumatic shut-off valve of Statement 13 wherein: port A is in fluid communication with the positioner; port B is in fluid communication with the actuator; port C is vented to atmosphere; port D is in fluid communication with the positioner; and port E is in fluid communication with the actuator.

[0113] Statement 15. The pneumatic shut-off valve of Statement 14 wherein port F is sealed by a plug or is in fluid communication with an onboard air reservoir.

[0114] Statement 16. The pneumatic shut-off valve of Statement 12 wherein said onboard reservoir air supply is in fluid communication with said port F.

[0115] Statement 17. The pneumatic shut-off valve of Statement 11 wherein said reservoir air supply is an external independent reservoir.

[0116] Statement 18. The pneumatic shut-off valve of Statement 17 wherein the external independent air reservoir is in fluid communication with an external air reservoir port of the pneumatic shut-off valve.

[0117] Statement 19. The pneumatic shut-off valve of Statement 13 wherein the onboard reservoir air supply is in fluid communication with an external reservoir port of the pneumatic shut-off valve.

[0118] Statement 20. The pneumatic shut-off valve of Statement 17 wherein: port A is in fluid communication with the positioner; port B is in fluid communication with the actuator; port C is vented to atmosphere; port D is in fluid communication with the positioner; and port E is in fluid communication with the actuator.

[0119] Statement 21. The pneumatic shut-off valve of Statement 17 wherein port F is sealed by a plug or is in fluid communication with an onboard air reservoir.

[0120] Statement 22. The pneumatic shut-off valve of Statement 21 wherein the onboard air reservoir is integrated with at least one of a positioner or an actuator.

[0121] Statement 23. The pneumatic shut-off valve of Statement 1 wherein said check valve is disposed within said valve body.

[0122] Statement 24. A pneumatic shut-off valve according to Statement 1, wherein the pneumatic shut-off valve further comprises: a valve core chamber, the valve core chamber being defined by the valve body and a valve core assembly disposed in the valve core chamber; the valve core assembly further comprising a valve core sleeve, a biasing member, a valve core having a plurality of recesses, a plurality of sealing mechanisms and a plurality of spacers; wherein each of the plurality of spacers is separated by one of the plurality of sealing mechanisms; wherein at least one of the plurality of spacers is fluidically connected to at least one of port A, port B, port C or port F; and wherein the valve core translates within the valve core sleeve in response to air pressure of the air supply.

[0123] Statement 25. The pneumatic shut-off valve of Statement 24, wherein a notch in said plurality of notches is positioned proximal to at least one spacer in said plurality of spacers during translation of said spool.

[0124] Statement 26. The pneumatic shut-off valve of Statement 25, wherein said notch facilitates fluid communication between two or more spacers after translation of said spool during fail-safe operation.

[0125] Statement 27. The pneumatic shut-off valve of Statement 24 further comprising a switch plate further defining a switch plate air path providing fluid communication between the first internal air path and the spool chamber.

[0126] Statement 28. The pneumatic shutoff valve of Statement 24 wherein said spool translates within said spool sleeve in response to a reduction in air pressure, and wherein said pneumatic shutoff valve assumes said fail-safe configuration.

[0127] Statement 29. The pneumatic shut-off valve of Statement 24, wherein said spool translates within said spool sleeve in response to an increase or return of air pressure, and wherein said pneumatic shut-off valve assumes said normal configuration.

[0128] Statement 30. The pneumatic shut-off valve of any of Statements 1-29 wherein said reduction in said air supply received at said first port comprises a reduction in air pressure below a minimum threshold.

[0129] Statement 31. The pneumatic shut-off valve of Statement 30, wherein said minimum threshold value is in the range of 0-150 psi.

[0130] Statement 32. The pneumatic shut-off valve of Statement 1 further comprising a reversing valve in fluid communication with the valve body.

[0131] Statement 33. The pneumatic shut-off valve of any of Statements 1-32, wherein said first internal air path is in communication with a second port.

[0132] Statement 34. A fluid control system comprising: a pneumatic shut-off valve, an actuator, a control valve and a positioner; the system comprising: the pneumatic shut-off valve, the pneumatic shut-off valve further comprising: a valve body, the valve body further comprising: a first internal air path, the first internal air path being connected to a first port; a second internal air path, the second internal air path being connected to the first internal air path, wherein the first internal air path and the second internal air path are connected through a check valve fluid; a first three-way valve; and a second three-way valve; and wherein when an air supply is provided to the first port, the first three-way valve and the second three-way valve assume a normal operating configuration; and wherein the first three-way valve and the second three-way valve assume a fail-safe configuration in response to a reduction in the air supply received at the first port.

[0133] Statement 35. The fluid control system of Statement 34, wherein said actuator is in fluid communication with at least one of said valve body or said control valve.

[0134] Statement 36. The fluid control system of Statement 34 wherein said first three-way valve comprises port A, port B, and port C, and said second three-way valve comprises port D, port E, and port F. ...

[0135] Statement 37. A fluid control system according to Statement 34, wherein: port A is in fluid communication with the positioner; port B is in fluid communication with the actuator; port C is vented to atmosphere; port D is in fluid communication with the positioner; and port E is in fluid communication with the actuator.

[0136] Statement 38. The fluid control system of Statement 36 wherein port F is sealed by a plug or is in fluid communication with an onboard air reservoir.

[0137] Statement 39. The fluid control system of Statement 38 wherein said onboard air reservoir is integrated with at least one of said positioner or said actuator.

[0138] Statement 40. The fluid control system of any of Statements 34-39, wherein said first internal air path is in communication with a second port.

[0139] Based on the description of the above embodiments, when we can fully understand the operation, use and effect of this invention, the above embodiments are only preferred embodiments of this invention, and this should not be limited thereto. The implementation scope of the invention, that is, simple equivalent changes and modifications based on the scope of the patent application of this invention and the content of the invention description, are all within the scope of this invention.

Claims

1. A pneumatic shut-off valve, comprising: The valve body further comprises: a first internal air path in communication with the first port; a second internal air path, the second internal air path communicating with the first internal air path, wherein the first internal air path and the second internal air path are in fluid communication via a check valve disposed within the valve body; a valve core assembly received in the valve core chamber; a first three-way valve, the first three-way valve comprising port A, port B and port C; and A second three-way valve, the second three-way valve comprising a port D, a port E and a port F; and wherein when air supply is provided to the first port, the first three-way valve and the second three-way valve assume a normal operating configuration; and, Wherein the first three-way valve and the second three-way valve assume a fail-safe configuration in response to the air supply received at the first port decreasing below a minimum threshold.

2. The pneumatic shut-off valve of claim 1, wherein the port F is in fluid communication with the second internal air path.

3. The pneumatic shut-off valve of claim 1 or 2, further comprising an external reservoir port.

4. The pneumatic shut-off valve of claim 1, wherein the fail-safe configuration includes providing fluid communication between the port B and the port C.

5. The pneumatic shut-off valve of claim 4, wherein in a fail-safe configuration, the port B is also in fluid communication with the port A.

6. The pneumatic shut-off valve of claim 1, wherein the fail-safe configuration includes providing fluid communication between the port E and the port F.

7. The pneumatic shut-off valve of claim 6, wherein in a fail-safe configuration, said port E is also in fluid communication with said port D.

8. The pneumatic shut-off valve of claim 1, wherein the first internal air path is in fluid communication with a main air supply.

9. The pneumatic shut-off valve of claim 1, wherein the second internal air path is in fluid communication with a reservoir air supply.

10. The pneumatic shut-off valve of claim 9, wherein the reservoir air supply is an onboard air reservoir integrated with the pneumatic shut-off valve.

11. The pneumatic shut-off valve of claim 9, wherein the reservoir air supply is an onboard reservoir integrated with an actuator or positioner.

12. The pneumatic shut-off valve of claim 11, wherein: Port A is in fluid communication with the positioner; Port B is in fluid communication with the actuator; Port C exhausts to the atmosphere; Port D is in fluid communication with the positioner; and Port E is in fluid communication with the actuator.

13. The pneumatic shut-off valve of claim 11, wherein the reservoir air supply is an external, independent reservoir.

14. The pneumatic shut-off valve according to claim 1, further comprising: The valve core assembly also includes a valve core sleeve, a biasing member, a valve core having a plurality of indentations, a plurality of sealing mechanisms, and a plurality of spacers; wherein each of the plurality of spacers is separated by a sealing mechanism among the plurality of sealing mechanisms; wherein at least one of the plurality of spacers is in fluid communication with at least one of port A, port B, port C, or port F; and The valve core translates within the valve core sleeve in response to air pressure of the air supply.

15. The pneumatic shut-off valve of claim 14, wherein one of the plurality of indentations is positioned proximal to at least one of the plurality of spacers during translation of the valve core.

16. The pneumatic shut-off valve of claim 14, further comprising a switch plate, the switch plate further defining a switch plate air path providing fluid communication between the first internal air path and the valve core chamber.

17. The pneumatic shut-off valve of claim 14, wherein the valve spool translates within the valve spool sleeve in response to a reduction in air pressure, and wherein the pneumatic shut-off valve assumes the fail-safe configuration.

18. The pneumatic shut-off valve of claim 14, wherein the valve core translates within the valve core sleeve in response to an increase or return of air pressure, and wherein the pneumatic shut-off valve assumes the normal configuration.

19. A fluid control system comprising a pneumatic shut-off valve, an actuator, a control valve and a positioner; The system comprises: The pneumatic shut-off valve further comprises: The valve body further comprises: a first internal air path in communication with the first port; a second internal air path, the second internal air path communicating with the first internal air path, wherein the first interior air path and the second interior air path are in fluid communication via a check valve; a first three-way valve; and a second three-way valve; and wherein when air supply is provided to the first port, the first three-way valve and the second three-way valve assume a normal operating configuration; and, Wherein the first three-way valve and the second three-way valve assume a fail-safe configuration in response to a reduction in the air supply received at the first port.

20. The fluid control system of claim 19, wherein the onboard air reservoir is integrated with at least one of a positioner or an actuator.

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