Check valve device

Abstract

A check valve device is provided, which is difficult to cause a pressure fluid to leak from a flow path blocked by a valve. A flow path (2) is formed in a block (1), and a main valve (3) and a sub valve (4) are provided in series at a middle portion of the flow path (2). A primary side chamber (5), an intermediate chamber (7), and a secondary side chamber (6) which constitute a part of the flow path (2) are formed in order from one end side to the other end side of the flow path (2). A pilot valve (60) performs an opening valve operation on the main valve (3) and the sub valve (4).

Description

Technical Field

[0001] This invention relates to check valve devices, and more particularly, to the technology of check valve devices that are forcibly opened by a pilot valve. Background Technology

[0002] In such a check valve device, there is a conventional device described in Patent Document 1 (Japanese Utility Model Application Publication No. 52-116722). This conventional technology is configured as follows.

[0003] A receiving hole is formed vertically within the block. A cylindrical main valve member is movably inserted into the receiving hole. A main valve seat is formed circumferentially on the inner peripheral wall of the receiving hole. A main valve face, capable of abutting against the main valve seat, is formed circumferentially at the lower end of the main valve member. The main valve member has a cylindrical bore with a large-diameter bore and a small-diameter bore extending sequentially from the top. A secondary valve member is movably inserted into the large-diameter bore. A secondary valve seat is formed at the periphery of the small-diameter bore on the side of the large-diameter bore. A secondary valve face is formed circumferentially at the lower end of the secondary valve member, capable of abutting against the secondary valve seat. A closing valve spring is installed between the secondary valve member and the block. This closing valve spring applies force to the secondary valve member toward the secondary valve seat, and the main valve member, pushed by the secondary valve member, applies force toward the main valve seat. Additionally, a piston is movably inserted into the lower part of the receiving hole, and a pilot portion protrudes upward from the piston. The upper small-diameter portion of the pilot section inserts into the small-diameter hole of the main valve member, and the pilot section can abut against the auxiliary valve member. An inlet spring mounted on the lower side of the piston's actuating chamber moves the piston upwards. Additionally, when pressurized fluid is supplied to the upper actuating chamber of the piston, the piston retracts downwards. In this check valve device, a supply / discharge path, forming one end of the flow path, is formed on the right wall of the block and communicates with a receiving hole. Within this receiving hole, the flow path branches into a first branch path and a second branch path. The first branch path is formed by the valve face and valve seat opening gap of the main valve member. The second branch path is formed by the small-diameter hole of the main valve member, the valve face and valve seat opening gap of the auxiliary valve member, the large-diameter hole of the main valve member, and a through hole formed on the peripheral wall of the main valve member. The first and second branch paths merge at the supply / discharge path formed on the left wall of the block.

[0004] Prior art literature

[0005] Patent documents

[0006] Patent Document 1: Japanese Utility Model Publication No. 52-116722 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] The aforementioned prior art has the following problems.

[0009] The aforementioned flow path is divided into a first branch and a second branch within the block. If either the main valve for opening / closing the first branch or the auxiliary valve for opening / closing the second branch fails to close for some reason, such as due to foreign matter like debris, compressed air (pressurized fluid) leaks out. Compared to a flow path within the block containing only one valve, conventional valve devices, with two sets of valves in one branch, have a higher probability of leaking pressurized fluid due to valve closure failure.

[0010] The purpose of this invention is to provide a check valve device with a structure that makes it difficult for pressurized fluid to leak from a flow path blocked by a valve.

[0011] Solution for solving the problem

[0012] To achieve the above objectives, the present invention, for example, Figures 1 to 4 , Figure 5 As shown, the check valve device is configured as follows.

[0013] A main valve 3 and a secondary valve 4 are connected in series in the middle of a flow path 2 formed within a block 1. A primary side chamber 5, an intermediate chamber 7, and a secondary side chamber 6, constituting part of the flow path 2, are formed sequentially from one end of the flow path 2 to the other. A pilot valve 60 opens the main valve 3 and the secondary valve 4. The main valve 3 connects and disconnects the secondary side chamber 6 and the intermediate chamber 7. The main valve 3 is configured as follows: A cylindrical main valve member 41 is axially movable and inserted into a receiving hole 10 formed within the block 1. A main valve surface 45 is formed on the outer peripheral wall of the main valve member 41, abutting against a main valve seat 46 formed circumferentially on the inner peripheral wall of the receiving hole 10. A closing valve spring 47 applies force to the main valve member 41 toward the main valve seat 46. The secondary valve 4 connects and disconnects the primary side chamber 5 and the intermediate chamber 7. The secondary valve 4 is configured as follows. A secondary valve member 50, movable along the axial direction and inserted into the cylindrical bore 48 of the main valve member 41, is spaced apart from the main valve member 41 by a predetermined gap in the axial direction and abuts against the ground surface. A secondary valve surface 55, capable of abutting against a secondary valve seat 56 formed circumferentially on the inner peripheral wall of the receiving hole 10, is formed on the outer peripheral wall of the secondary valve member 50. The pilot valve 60 has a pilot valve member 63. This pilot valve member 63 is movable toward the secondary valve member 50 and inserted into the block 1, spaced apart from the secondary valve member 50 by a predetermined gap and abutting against the ground surface. Furthermore, the pilot valve member 63 is forced away from the secondary valve member 50 by a retraction spring 66 installed in the receiving hole 10, and moves toward the secondary valve member 50 by pressurized fluid supplied to the actuation chamber 76 provided in the block 1.

[0014] The present invention achieves the following effects.

[0015] In the aforementioned check valve device, a main valve and a secondary valve are connected in series in a flow path. Therefore, since the pressure fluid in the secondary chamber is blocked by the main valve and the secondary valve, even if one of the main valves or the secondary valve cannot close for some reason, the pressure fluid can be prevented from leaking out of the secondary chamber by closing the other valve. Attached Figure Description

[0016] Figure 1 This is a schematic cross-sectional view of a check valve device, illustrating one embodiment of the present invention.

[0017] Figure 2 This is an instruction diagram illustrating the operation of the aforementioned check valve device, which is related to... Figure 1 Similar diagrams.

[0018] Figure 3 This is an instruction diagram illustrating the operation of the aforementioned check valve device, which is related to... Figure 1 Similar diagrams.

[0019] Figure 4 This is an instruction diagram illustrating the operation of the aforementioned check valve device, which is related to... Figure 1 Similar diagrams.

[0020] Figure 5 This refers to a check valve device that represents a variation of the above-described embodiment, and is related to... Figure 4 Similar diagrams. Detailed Implementation

[0021] The following is through Figures 1 to 4 This invention describes one embodiment.

[0022] The check valve device of the present invention has a flow path 2 for supplying and discharging compressed air (pressurized fluid) within a rectangular metal block 1. A main valve 3 and a secondary valve 4 are arranged in series in the middle of the flow path 2. A primary side chamber 5, an intermediate chamber 7, and a secondary side chamber 6 are formed sequentially from one end of the flow path 2 to the other, forming part of the flow path 2. The primary side chamber 5 is connected to a compressed air source supplying compressed air (pressurized fluid). The secondary side chamber 6 is connected to the operating chamber of an actuator. The main valve 3 connects and disconnects the secondary side chamber 6 and the intermediate chamber 7. The secondary valve 4 connects and disconnects the primary side chamber 5 and the intermediate chamber 7. Thus, all the compressed air supplied from the compressed air source to the primary side chamber 5 flows into the intermediate chamber 7 through the opening gap of the secondary valve 4, and the compressed air in the intermediate chamber 7 is supplied to the operating chamber of the actuator through the opening gap of the main valve 3 and the secondary side chamber 6.

[0023] The check valve device described above has the following structure: when compressed air is supplied from the compressed air source to the primary side chamber 5 and the supply stops, even if compressed air leaks from either the main valve 3 or the auxiliary valve 4 due to some reason, such as foreign objects such as garbage, the valve of the other valve is closed, thus preventing compressed air from flowing out of the secondary side chamber.

[0024] like Figures 1 to 4 As shown, the above-mentioned check valve device is configured as follows.

[0025] A rectangular metal block 1 (made of iron in this embodiment) has a receiving hole 10 formed in a manner that extends through the left and right directions. An annular step portion 11 is formed on the inner peripheral wall near the center of the receiving hole 10, and a cylindrical primary side filter 12 is inserted from the left side in a manner that fits tightly against the step portion 11. The primary side filter 12 has a metal mesh 15 held between an inner cylinder 13 and an outer cylinder 14, and U-shaped fasteners 16 that hold the right ends of the inner cylinder 13 and the outer cylinder 14, and the left ends of the inner cylinder 13 and the outer cylinder 14, respectively.

[0026] A cylindrical member 21, which is sealed to the left end of the primary side filter 12 via a sealing member 20, is inserted into the receiving hole 10 in a sealed manner. This cylindrical member 21 has four holes, from the left side, sequentially formed from the first hole 22 to the fourth hole 25, with the diameter of each hole decreasing sequentially from the first hole 22. A secondary side filter 30, which is sealed to the annular stepped portion 29 between the first hole 22 and the second hole 23, is inserted into the first hole 22. An annular gap 31 is formed between the outer peripheral surface of the secondary side filter 30 and the inner peripheral surface of the first hole 22. Furthermore, the secondary side filter 30 is configured identically to the primary side filter 12.

[0027] A left cover member 32, which engages with the left end of the aforementioned cylindrical member 21, is inserted into the receiving hole 10 in a sealed manner. The left cover member 32 is prevented from falling out of the receiving hole 10 by a retaining ring 33. The left cover member 32 has a base portion 34 that is inserted into the receiving hole 10 in a sealed manner and a cylindrical portion 35 that protrudes to the right from the base portion 34. The right wall of the base portion 34 is sealed against the left end of the secondary side filter 30 via an annular sealing member 36. Therefore, the inner and outer spaces of the secondary side filter 30 are divided by the secondary side filter 30, the cylindrical member 21, and the left cover member 34. Furthermore, the cylindrical portion 35 is inserted into the cylindrical hole 37 of the secondary side filter 30 through a predetermined annular gap 38.

[0028] The cylindrical main valve member 41 of the main valve 3 can be slidably inserted into the cylindrical hole 39 of the cylindrical portion 35. A flange portion 42 protrudes radially outward from the right end of the main valve member 41, and a tapered portion is formed on the outer peripheral wall of the flange portion 42, gradually tapering towards the right. A receiving groove is formed circumferentially on the tapered portion, and an O-ring or other sealing member is installed in the receiving groove. A main valve surface 45 is formed on the outer peripheral surface of the sealing member. This main valve surface 45 can engage with a main valve seat 46 formed circumferentially on the inner peripheral wall of the third hole 24 of the cylindrical member 35. A closing valve spring 47 is installed between the main valve member 41 and the bottom wall of the cylindrical hole 39 of the cylindrical portion 35, and this closing valve spring 47 applies a force to the right of the main valve member 41 toward the main valve seat 46 relative to the left cover member 32.

[0029] The secondary valve component 50 of the secondary valve 4 is axially movable and inserted into the cylindrical bore 48 of the main valve component 41 in a sealed manner via the sealing member 51. A flange portion 52 protrudes radially outward from the right end of the secondary valve component 50, and a tapered portion is formed on the outer peripheral wall of the flange portion 52, gradually tapering towards the right. A receiving groove is formed circumferentially on the tapered portion, and a sealing member such as an O-ring is installed in the receiving groove. A secondary valve surface 55 is formed on the outer peripheral surface of the sealing member. This secondary valve surface 55 can engage with a secondary valve seat 56 formed circumferentially on the inner peripheral wall of the fourth hole 25 of the cylindrical component 21.

[0030] The area of ​​the cross-section S of the sealing portion formed by the main valve face 45 and the main valve seat 46 of the main valve 3 is set to be larger than the area of ​​the cross-section T of the sealing portion formed by the auxiliary valve face 55 and the main valve seat 56 of the auxiliary valve 4. Therefore, the force of the compressed air in the secondary side chamber 6 pressing the sealing portion of the main valve 3 in the closed state is greater than the force of the compressed air in the secondary side chamber 6 pressing the sealing portion of the auxiliary valve 4 in the closed state. In addition, the main valve member 41 is always pushed to the right by the valve closing spring 47. Thus, when both the main valve 3 and the auxiliary valve 4 are in the closed state, if the force of the compressed air in the primary side chamber 5 pressing the auxiliary valve member 50 exceeds the force of the compressed air in the secondary side chamber 6 pressing the auxiliary valve member 50, the auxiliary valve 4 opens. Compressed air flows into the intermediate chamber 7 through the opening gap of the auxiliary valve 4. At this time, the main valve 3 is still in the closed state. In addition, since the volume of the intermediate chamber 7 is made narrower than that of the primary side chamber 5 or the secondary side chamber 6, it is possible to prevent abrupt pressure changes in the primary side chamber 5. Therefore, it is possible to prevent repeated opening and closing of the secondary valve 4 due to rapid pressure changes (the generation of chatter), and as a result, it is possible to prevent wear or damage to the components of the secondary valve 4 caused by chatter.

[0031] As described above, even when the pressure in the primary side chamber 5 reaches the opening pressure value of the secondary valve 4, the main valve 3 does not open. Then, when the pressure in the primary side chamber 5 rises and exceeds the combined force of the pressing force of the compressed air in the secondary side chamber 6 and the force of the closing spring 47, the main valve 3 opens. Consequently, sometimes the pressurized fluid from the primary side chamber 5 and the intermediate chamber 7 flows into the secondary side chamber 6 through the opening gap of the main valve 3, causing a sharp drop in pressure on the primary side chamber 5 side, and the main valve 3 to flutter. In this situation, the main valve 3 is sometimes affected by flutter, but the secondary valve 4 is located away from the secondary valve seat 56 to prevent wear or damage caused by flutter.

[0032] When the aforementioned secondary valve 4 and main valve 3 are opened, the pressure difference between the primary chamber 5 and the secondary chamber 6 disappears, so the force exerted on the secondary valve member 50 from the primary chamber 5 and the force exerted on it from the secondary chamber 6 cancel each other out. Similarly, the force exerted on the main valve member 41 from the primary chamber 5 and the force exerted on it from the secondary chamber 6 also cancel each other out, leaving only the force of the closing spring 47 acting on the main valve member 41. Therefore, the compressed air passing through the opening gap of the main valve 3 generates a pressure loss corresponding to the force of the closing spring 47, but the compressed air passing through the opening gap of the secondary valve 4 generates no or reduced pressure loss. Therefore, compared to the case where the main valve 3 and secondary valve 4 are each exerted by a closing spring, the pressure loss of the compressed air passing through the opening gap of the main valve 3 and secondary valve 4 can be suppressed less.

[0033] In the aforementioned check valve device, a pilot valve 60 is provided within the block to switch the operation of the auxiliary valve 4 and the main valve 3 from the closed state to the open state. This pilot valve 60 is configured as follows.

[0034] A portion of the aforementioned receiving hole 10 forms the cylinder bore 61, specifically the portion of the receiving hole 10 to the right of the stepped portion 11. A pilot valve member 63 is inserted into this cylinder bore 61 in a sealed manner and is axially movable. The pilot valve member 63 has a body portion 64 that is inserted into the cylinder bore 61 in a sealed manner and a locking portion 65 that protrudes to the left with a diameter smaller than that of the body portion 64. This locking portion 65 can be inserted into the fourth hole 25 of the aforementioned cylinder member 21 and can abut against the auxiliary valve member 50. A retraction spring 66 is installed within the cylinder bore 61, between the right wall of the cylinder member 21 and the left wall of the body portion 64 of the pilot valve member 63. This retraction spring 66 exerts a force on the pilot valve member 63 to the right relative to the cylinder member 21.

[0035] The large-diameter hole 70, which forms part of the aforementioned receiving hole 10, is formed continuously with the right side of the cylinder bore 61. A cylindrical filter 72 is inserted into the large-diameter hole 70 such that it fits snugly against the stepped portion 71 of both the large-diameter hole 70 and the cylinder bore 61. This filter 72 has the same structure as the primary side filter 12 and the secondary side filter 30. A right cover member 73 is inserted into the large-diameter hole 70 in a sealed manner, fitting snugly against the right end of the filter 72 via a sealing member. The left small-diameter portion 74 of the right cover member 73 is inserted into the cylindrical hole of the filter 72. The right cover member 73 is prevented from falling out of the large-diameter hole 70 by a retaining ring 75.

[0036] The main body 64 of the aforementioned pilot valve component 63 is supported by the right cover component 73. An actuation chamber 76 is formed between the right surface of the pilot valve component 63 and the right cover component 73. An actuation compressed air supply and exhaust passage 78, which communicates with the annular gap 77 formed within the actuation chamber 76 and between the outer peripheral surface of the filter 72 and the inner peripheral surface of the large-diameter hole 70, is formed in the lower right part of the block 1. Compressed air from a compressed air source is supplied and discharged through the supply and exhaust passage 78.

[0037] In the check valve device of this embodiment, a primary side chamber 5 is formed by the space between the cylinder member 21 and the pilot valve member 63 within the aforementioned receiving hole 10. A main valve chamber (intermediate chamber) 7 is formed within the cylinder hole of the cylinder member 21 in communication with this primary side chamber 5. Furthermore, a primary side supply / discharge passage 80 is formed near the lower center of the block 1. This primary side supply / discharge passage 80 communicates with an annular gap 81 formed between the inner circumferential surface of the receiving hole 10 and the outer circumferential surface of the primary side filter 12, and is connected to a compressed air source. Thus, compressed air from the compressed air source is supplied and discharged relative to the primary side chamber 5 through the primary side supply / discharge passage 80, the annular space 81, and the primary side filter 12.

[0038] A secondary side supply passage 82 is formed in the upper left part of the aforementioned block 1. This secondary side supply passage 82 communicates with an annular gap 83 formed between the inner circumferential surface of the receiving hole 10 and the outer circumferential surface of the cylindrical member 21. Furthermore, this annular gap 83 communicates with the inner cavity of the cylindrical member 21 through a through hole 84 formed in the cylindrical wall of the cylindrical member 21. Thus, the secondary side supply passage 82 communicates with the secondary side chamber 6 through the annular space 83, the through hole 84, the first hole 22 of the cylindrical member 21, and the secondary side filter 30. This secondary side supply passage 82 communicates with the operating chamber of the actuator.

[0039] In this embodiment, the flow path 2 is composed of a primary side supply and discharge path 80, an annular space 81, a primary side chamber 5, an intermediate chamber 7, a secondary side chamber 6, a through hole 84, an annular space 83, and a secondary side supply and discharge path 82.

[0040] like Figures 1 to 4 As shown, the above-mentioned check valve device operates as follows.

[0041] exist Figure 1 In the initial state (closed valve state), compressed air from the primary side supply / discharge line 80 is discharged to the outside. Additionally, compressed air from the operating supply / discharge line 78 is also discharged to the outside. Therefore, the pressure of the compressed air in the primary side chamber 5, which is connected to the primary side supply / discharge line 80, is approximately atmospheric pressure. Therefore, the pressing force generated by the pressure of the compressed air in the secondary side chamber 6, along with the force of the closing valve spring 47, causes the main valve member 41 to move to the right, engaging the main valve face 45 of the main valve member 41 with the main valve seat 46, thus closing the main valve 3. Furthermore, the pressing force generated by the pressure of the compressed air in the secondary side chamber 6 causes the auxiliary valve member 50 to move to the right, engaging the auxiliary valve face 55 of the auxiliary valve member 50 with the auxiliary valve seat 56, thus closing the auxiliary valve 4.

[0042] When compressed air from the compressed air source is supplied to the actuator via the check valve device, firstly, the compressed air from the compressed air source is supplied to the primary side chamber 5 through the primary side supply / exhaust line 80 and the primary side filter 12. At this time, compressed air from the compressed air source is not supplied to the actuation chamber 76. Then, the pressing force generated by the pressure of the compressed air in the primary side chamber 5 and the force of the retracting spring 66 push the pilot valve member 63 to the right, which is received by the right cover member 73 from the right side. Additionally, the compressed air in the primary side chamber 5 pushes the secondary valve member 50 to the left. When the pressing force generated by the pressure of the compressed air in the primary side chamber 5 exceeds the pressing force generated by the pressure of the compressed air in the secondary side chamber 6, the compressed air in the primary side chamber 5 causes the secondary valve member 50 to move to the left. Therefore, the secondary valve face 55 moves away from the secondary valve seat 56, and the secondary valve 4 opens. Thus, the compressed air in the primary side chamber 5 flows into the intermediate chamber 7 through the valve opening gap. When the pressing force generated by the compressed air in the intermediate chamber 7 exceeds the combined force of the pressing force generated by the compressed air in the secondary chamber 6 and the force of the closing spring 47, the compressed air in the intermediate chamber 7 causes the auxiliary valve member 50 and the main valve member 41 to move to the left. Therefore, the main valve face 45 moves away from the main valve seat 46, and the main valve 3 opens. Thus, compressed air from the compressed air source is supplied to the actuator's operating chamber through the primary chamber 5, the intermediate chamber 7, the secondary chamber 6, and the secondary supply / discharge line 82.

[0043] When the supply of compressed air from the aforementioned compressed air source is stopped, the pressing force generated by the pressure of the compressed air in the secondary side chamber 6 and the force of the valve closing spring 47 cause the main valve member 41 to move to the right, closing the main valve 3. Additionally, the pressing force generated by the pressure of the compressed air in the secondary side chamber 6 causes the auxiliary valve member 50 to move to the right, closing the auxiliary valve 4.

[0044] When the compressed air in the actuator's operating chamber is discharged to the outside, the compressed air in the primary side chamber 5 is also discharged to the outside, and compressed air from the compressed air source is supplied to the operating chamber 76 through the operating supply and exhaust line 78 and the filter 72. The pressure generated by the compressed air in the operating chamber 76 then overcomes the force of the retracting spring 66, causing the pilot valve member 63 to move to the left. Next, the engaging portion 65 of the pilot valve member 63 inserts into the cylinder hole of the cylinder member 21, pushing the secondary valve member 50 to the left and opening the secondary valve 4. Then, the flange portion 52 of the secondary valve member 50 pushes the main valve member 41 to the left, opening the main valve 3. Thus, the compressed air in the actuator's operating chamber is discharged to the outside through the check valve device.

[0045] The above-described embodiments have the following advantages.

[0046] In the aforementioned check valve device, a main valve 3 and a secondary valve 4 are connected in series in a flow path 2. Therefore, since the compressed air in the secondary side chamber 6 is blocked by the main valve 3 and the secondary valve 4, even if one of the main valves or the secondary valve cannot close for some reason, the other valve will also be closed, thus preventing the pressurized fluid from leaking out of the secondary side chamber 6.

[0047] Figure 5 These are variations of embodiments of the present invention. In these variations, components that are the same as (or similar to) the constituent components of the embodiments described above are generally described with the same reference numerals.

[0048] The differences between the variations of the above embodiments and the above embodiments are as follows.

[0049] like Figure 5 As shown, a first supply / discharge passage 78 for operation, communicating with the large-diameter hole 70 of the receiving hole 10, is formed in the lower right part of the block 1. This first supply / discharge passage 78 is connected to a compressed air source. Additionally, a second supply / discharge passage 87 for operation, also communicating with the large-diameter hole 70 of the receiving hole 10, is formed in the upper right part of the block 1. This second supply / discharge passage 87 is connected to the release chamber, which serves as the actuation chamber of the actuator. Furthermore, a secondary supply / discharge passage 82 is connected to the locking chamber, which also serves as the actuation chamber of the actuator.

[0050] When the compressed air in the locking chamber of the actuator is discharged to the outside, the compressed air in the primary side chamber 5 is also discharged. Additionally, compressed air from the compressed air source is supplied to the actuator's release chamber via the actuating first supply / discharge passage 78, filter 72, and second supply / discharge passage 87, and the compressed air supplied to the actuating chamber 76 causes the pilot valve member 63 to move to the left. Next, the engaging portion 65 of the pilot valve member 63 inserts into the cylinder bore 39 of the cylinder member 21, pushing the auxiliary valve member 50 to the left and opening the auxiliary valve 4. Then, the flange portion 52 of the auxiliary valve member 50 pushes the end portion of the main valve member 41 to the left, opening the main valve 3. Thus, the secondary side supply / discharge passage 82 connects to the primary side supply / discharge passage 80 through the main valve chamber 7 and the auxiliary valve chamber 5. As a result, the compressed air in the actuator's locking chamber is discharged to the outside through the flow path 2 of the check valve device.

[0051] The above-described embodiments can be modified as follows.

[0052] Pressure fluids can also replace compressed air as exemplified, such as other gases or liquids like hydraulic oil and water.

[0053] Furthermore, various modifications can certainly be made within the scope that can be conceived by those skilled in the art.

[0054] Explanation of reference numerals in the attached figures

[0055] 1 block

[0056] 2 flow path

[0057] 3 main valves

[0058] 4 auxiliary valves

[0059] 5. Primary lateral chamber

[0060] 6 Secondary lateral chambers

[0061] 7 intermediate rooms

[0062] 10 containment holes

[0063] 41 Main Valve Components

[0064] 45 main valve face

[0065] 46 main valve seat

[0066] 47 valve closing spring

[0067] 48 cylinder holes

[0068] 50 auxiliary valve components

[0069] 55 valve face

[0070] 56 auxiliary valve seats

[0071] 60 pilot valve

[0072] 63 Pilot Valve Components

[0073] 66 Reverse Spring

[0074] 76 Action Room

Claims

1. A check valve device comprising: a main valve (3) and a secondary valve (4) arranged in series in the middle of a flow path (2) formed within a block (1); a primary side chamber (5), an intermediate chamber (7), and a secondary side chamber (6) formed sequentially from one end of the flow path (2) to the other end, forming part of the flow path (2); and a pilot valve (60) for opening the main valve (3) and the secondary valve (4), characterized in that, The main valve (3) that connects and disconnects the secondary side chamber (6) and the intermediate chamber (7) has: The cylindrical main valve component (41) is axially movable and can be inserted into the receiving hole (10) formed in the block (1); The main valve face (45) is formed on the outer peripheral wall of the main valve member (41) in such a way that it can abut against the main valve seat (46) formed on the inner peripheral wall of the receiving hole (10) in the circumferential direction; as well as The closing spring (47) applies force to the main valve component (41) toward the main valve seat (46). The secondary valve (4) that connects and disconnects the primary side chamber (5) and the intermediate chamber (7) has: The auxiliary valve component (50) is movably inserted into the cylindrical hole (48) of the main valve component (41) along the axial direction, and is spaced apart from the main valve component (41) by a predetermined gap in the axial direction and is able to abut against the ground surface; as well as The secondary valve face (55) is formed on the outer peripheral wall of the secondary valve member (50) in such a way that it can abut against the secondary valve seat (56) formed circumferentially on the inner peripheral wall of the receiving hole (10). The pilot valve (60) has a pilot valve member (63) that is movably inserted into the block (1) toward the sub-valve member (50), and is spaced apart from the sub-valve member (50) by a predetermined gap and is able to abut against the ground surface. The pilot valve member (63) is forced away from the sub-valve member (50) by a retraction spring (66) installed in the receiving hole (10), and moves toward the sub-valve member (50) by pressurized fluid supplied to the actuation chamber (76) provided in the block (1).

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