Stop valve

Abstract

The invention provides a stop valve capable of reducing abrasion of a metal valve body. The shut-off valve of the present invention comprises: a housing in which a flow path for a working fluid (e.g., high-pressure hydrogen gas) extending in a central axis direction of the housing is formed; the valve rod is arranged in the flow path and extends along the central axis direction; the valve body is formed at the tail end of the valve rod; a valve seat formed near an end portion of the flow path in the housing; and a valve closing mechanism for pressing the valve body against the valve seat, the valve closing mechanism including: an actuator provided at an end of the housing opposite the valve seat in the central axis direction and having a function of moving the valve stem in the central axis direction; the valve closing force adjusting mechanism includes an elastic repulsive force eliminating device having a function of eliminating the elastic repulsive force of the valve rod engaging portion actuating spring and a valve rod actuating shaft accommodating device having a function of eliminating the elastic repulsive force of the pressure adjusting spring.

Description

Technical Field

[0001] This invention relates to a shut-off valve for high-pressure fluids such as high-pressure hydrogen, and to a shut-off valve having a metal valve body and a valve seat. Background Technology

[0002] In traditional high-pressure fluid shut-off valves (such as high-pressure hydrogen shut-off valves), resin valve bodies offer good sealing at low pressures but suffer from poor durability at high pressures. In contrast, while metal valve bodies offer good strength and durability, they also exhibit poor sealing at low pressures. Pre-pressing the metal valve body against the valve seat with a spring is an effective method to address this low-pressure sealing issue. However, under high pressure, the combined force of the high-pressure gas and the spring's elastic repulsion acts on the valve body, leading to wear and tear on the metal valve body.

[0003] Another prior art proposes a gate valve whose sliding portion improves sliding performance, sealing performance, and durability (see JP6972506B). While this technology is practical, it does not solve the following problem: in a gate valve that uses a spring to press the metal valve body against the valve seat, when the valve is closed, the pushing force of the high-pressure gas and the elastic repulsive force of the spring act simultaneously on the valve body, leading to wear of the valve body.

[0004] The contents of JP6972506B are incorporated herein by reference in their entirety. Summary of the Invention

[0005] The present invention addresses the problems existing in the prior art and aims to provide a shut-off valve in which a spring presses the metal valve body against the valve seat, thereby preventing the pressure of high-pressure gas and the elastic repulsive force of the spring from acting on the valve body simultaneously when the valve is closed, thus reducing the wear of the metal valve body.

[0006] [Problem-solving methods]

[0007] The shut-off valve 100 of the present invention includes: a housing 2 in which a flow path 3 for a fluid (e.g., high-pressure air, high-pressure nitrogen) extending along a central axis is formed; a valve stem 1 disposed within the flow path 3 and extending along the central axis; a valve body 1AT formed at the end of the valve stem 1; a valve seat 3AT formed near one end of the flow path 3 in the housing 2; and a valve closing mechanism 10 for pressing the valve body 1AT against the valve seat 3AT, the valve closing mechanism 10 comprising an actuator 11 and a valve closing force adjusting mechanism 50, and the valve closing force adjusting mechanism 50 including a pressure transmission chamber 5 and a valve stem actuator shaft receiving device 40, the valve stem actuator shaft receiving device 40 having a valve stem actuator shaft 13 engaged with the valve stem 1 and movable by the actuator 11 along the central axis, and a pressure adjusting spring 44 disposed between the valve stem actuator shaft 13 and the actuator 11, the valve stem actuator shaft 13 having a sealing mechanism 30 configured to prevent fluid from flowing into the actuator 11 side. In this invention, a spring may be provided between the valve stem 1 and the valve stem actuation shaft 13 in the pressure transmission chamber 5.

[0008] Furthermore, in this invention, the actuator 11 preferably includes: a shaft support member 14 engaged with the valve stem actuation shaft 13; a transmission member 15 (fluid supply bottom 12A and spring push portion 16) connected to the shaft support member 14; an actuator drive fluid supply portion 12 for supplying or discharging actuator drive fluid (e.g., high-pressure air, high-pressure nitrogen); and a shaft support member actuation spring 18, which is disposed at a position opposite to the actuator drive fluid supply portion 12 and engaged with the transmission member 15, and the transmission member 15 preferably moves along the central axis direction by supplying or discharging drive fluid to the actuator drive fluid supply portion 12 and the shaft support member actuation spring 18.

[0009] In the shut-off valve 100 of the present invention, a sealing mechanism 30 is provided in the flow path 3 formed along the central axis direction of the housing 2 through which the valve stem 1 passes. The sealing mechanism 30 has: a member (32: C-shaped ring) formed by cutting off a portion of the ring in the circumferential direction; a hollow cylindrical region 33A; and a member (33: hollow cylindrical body / flange composite member) with a flange 33B, the flange 33B extending radially outward in the valve body 1AT side (above) in the central axis direction (vertical direction) within the region 33A of the shut-off valve 100. Preferably, the hollow cylindrical region 33A of the component 33 is inserted into the central hollow portion 32A of the C-shaped component 32, and a spare ring 34 and an O-ring 35 are installed on the flange 33B. The assembly (unit) is arranged in multiple stages, consisting of the C-shaped component (32: C-ring), the component 33 having the hollow cylindrical region 33A and the flange 33B, and the spare ring 34 and O-ring 35 installed on the flange 33B of the component 33 having the hollow cylindrical region 33A and the flange 33B. Here, preferably, within the flow passage 3 extending within the valve stem 1, regions 31A with larger inner diameters are formed intermittently at equal intervals along the axial direction, and the C-shaped component (32: C-ring) is embedded in these regions 31A.

[0010] Invention Effects

[0011] According to the present invention with the above configuration, the actuator 11 of the valve closing mechanism 10 can place the valve body 1AT seat on the valve seat 3AT. At this time, the elastic repulsive force of the spring 4 also acts in the direction that places the valve stem 1 seat on the valve seat 3AT. However, the elastic repulsive force of the spring 4 can be eliminated by the elastic repulsive force elimination device 20 of the valve closing mechanism 10, and the elastic repulsive force of the pressure regulating spring 44 can be eliminated by the valve stem actuation shaft receiving device 40. Therefore, the force that places the valve body 1AT seat at the end of the valve stem 1 on the valve seat 3AT is only the force transmitted from the actuator 11, and the spring 4 and the valve stem actuation shaft receiving device 40 do not act / apply the amount of the elastic repulsive force of the pressure regulating spring 44 on the valve body 1AT, thereby reducing damage to the metal valve body 1AT and valve seat 3AT. Attached Figure Description

[0012] Figure 1 This is a cross-sectional view showing the open state of a shut-off valve according to an embodiment of the present invention.

[0013] Figure 2 yes Figure 1 A magnified cross-sectional view of part A in the middle.

[0014] Figure 3 It is shown in Figure 1 The diagram shows a cross-sectional view of the shut-off valve immediately after it has been closed.

[0015] Figure 4 It shows Figure 1 The diagram shows a cross-sectional view of the valve's state after a predetermined time has elapsed since it was closed.

[0016] Figure 5 This is a cross-sectional view showing the sealing mechanism in the illustrated embodiment.

[0017] Figure 6 yes Figure 5 A perspective view of the hollow cylindrical-flange composite component used in the sealing mechanism shown.

[0018] Figure 7 yes Figure 5 A perspective view of the C-ring used in the sealing mechanism shown.

[0019] Figure 8 This is a cross-sectional view illustrating a modified embodiment of the present invention. Detailed Implementation

[0020] An embodiment of the present invention will now be described with reference to the accompanying drawings. First, reference will be made to... Figures 1 to 4 An embodiment of the shut-off valve according to the present invention is described. In the illustrated embodiment, high-pressure hydrogen is used as the fluid, and a shut-off valve used in a filling device for filling a fuel cell vehicle (FCV) with high-pressure hydrogen as fuel is shown. Figure 1 and 2 The shut-off valve 100 is shown in the open position. Figure 1 In the middle, the shut-off valve 100 has: a housing 2, wherein a central axis is formed along the direction of the central axis ( Figure 1 A high-pressure hydrogen flow path 3 extending vertically within the flow path 3; a valve stem 1, which is disposed within the flow path 3 and extends along the central axis; a valve body 1AT (conical part: see Figure 2 ), which is formed at the front end of valve stem 1 ( Figure 1 The upper end of valve stem 1); valve seat 3AT (conical part: see Figure 2 It is formed near the end of the flow path 3 within the housing 2. Figure 2 The lower end of the flow path 3D in the middle); and the valve closing mechanism 10, which presses the valve body 1AT against the valve seat 3AT. Figure 1 Details of part A, including the valve body 1AT formed on the valve stem 1 and the valve seat 3AT formed near the end of the flow passage 3, will be referenced later. Figure 2 Describe it.

[0021] Figure 1 In the process, the valve closing mechanism 10 includes an actuator 11 and a valve closing force adjusting mechanism 50. The actuator 11 is located near the end of the flow path 3 on the opposite side of the valve seat 1AT in the direction of the central axis. Figure 1The valve closing adjustment mechanism 50 has an elastic repulsion elimination device 20, a valve stem actuation shaft receiving device 40, and a sealing mechanism 30. The actuator 11 has an actuator driving fluid supply section 12 for supplying or discharging actuator driving fluid (e.g., high-pressure air, high-pressure nitrogen), a transmission member 15, and a shaft support member actuation spring 18. The transmission member 15 has a fluid supply section bottom 12A and a spring pressing section 16, and functions to transmit the actuator driving fluid supplied or discharged by the actuator driving fluid supply section 12 to the shaft support member 14 and convert it into movement of the shaft support member 14 in the direction of the central axis. The shaft support member actuation spring 18 is disposed below the transmission member 15 to surround the shaft 14A of the shaft support member 14, and the shaft 14A is connected to the spring pressing section 16 via a connecting section 16A. Spring 18, through its elastic repulsive force, pushes shaft support member 14 upward along the central axis direction via transmission member 15 and shaft 14A, thereby pushing valve stem actuation shaft 13 and valve stem 1 upward along the central axis direction. Figure 1 In this process, a driving fluid is supplied to the actuator driving fluid supply unit 12 via a supply device (not shown), and the dimension of the actuator driving fluid supply unit 12 in the direction of its central axis (vertical direction) is greater than that of the other two units. Figure 3 and Figure 4 The size is larger. (To be discussed later) Figure 3 and 4 In this state, the driving fluid is discharged from the actuator driving fluid supply section 12 through the discharge device (not shown), and the dimension of the actuator driving fluid supply section 12 in the direction of the central axis (vertical direction) is greater than that of the other two sections. Figure 1 The size is smaller. Reference numerals 2-3 indicate the actuator-side housing.

[0022] The shaft 14A of the shaft support member 14 is disposed within the actuator-side housing 2-3. The shaft support member 14 is configured to have a diameter larger than that of the shaft 14A and supports the valve stem actuation shaft 13. The valve stem actuation shaft 13 extends along the central axis and is connected to the valve stem 1. When Figure 1 When the shut-off valve 100 shown is open, the lower end of shaft 14A abuts against the stop member 17 at the lower end of actuator 11. On the other hand, when Figure 3When the shut-off valve 100 shown is closed, the lower end of shaft 14A separates from the stop member 17. In the valve stem actuation shaft receiving device 40, located at the intermediate position between the actuator 11 and the elastic repulsion elimination device 20, the upper part of the shaft support member 14, the lower part of the valve stem actuation shaft 13, the valve stem actuation shaft engagement portion 42 that engages with the valve stem actuation shaft 13, and the pressure regulating spring 44 are disposed in the hollow receiving portion 46. The base 13A of the valve stem actuation shaft 13 is received in the shaft support member groove 14B formed on the upper part of the shaft support member 14, and the shaft support member 14 and the valve stem actuation shaft 13 are connected together. The pressure regulating spring 44 surrounds the shaft support member 14 and the base 13A of the valve stem actuation shaft 13. The lower part of the pressure regulating spring 44 abuts against the bottom of the hollow receiving portion 46, while the upper part of the pressure regulating spring 44 abuts against the valve stem actuation shaft engagement portion 42.

[0023] The elastic repulsion elimination device 20 includes a pressure transmission chamber 5, a spring 4, and a spring support member 7. The pressure transmission chamber 5 houses the end of the valve stem 1 opposite to the valve body 1AT (the lower end of the valve stem 1) and the end of the valve stem actuation shaft 13 located on the side of the valve stem 1 (the upper end of the valve stem actuation shaft 13). The pressure transmission chamber 5 has a valve stem engagement portion 6 that engages with the valve stem 1, and one end (the upper end) of the spring 4 is attached to this valve stem engagement portion 6. The pressure transmission chamber 5 also houses the spring support member 7 that engages with the valve stem actuation shaft 13, and the spring support member 7 has a flange 7A (the flange of the spring support member) that can contact the other end (the lower end) of the spring 4. The spring support member 7 houses the end (the upper end) of the valve stem actuation shaft 13 located on the side of the valve stem 1, and the valve stem actuation shaft 13 is connected to the valve stem 1 via the spring support member 7 and the valve stem engagement portion 6.

[0024] High-pressure hydrogen from the filling device (not shown) enters through the inlet 2A of the housing 2 and the inlet-side flow path 3A (see...). Figure 2 ) and valve actuation flow path 3C (see Figure 2 The high-pressure hydrogen gas flows into the pressure transmission chamber 5. Therefore, the pressure of the high-pressure hydrogen gas acts on the pressure transmission chamber 5. When the pressure in the pressure transmission chamber 5 rises above a predetermined value (which is set according to the specific situation by the elastic repulsive force of the pressure regulating spring 44), the valve stem actuation shaft 13 moves in a direction away from the spring 4 (downward) due to the pressure difference between the pressure transmission chamber 5 and the hollow receiving part 46.

[0025] exist Figure 1 In the middle, high-pressure hydrogen flows into the shut-off valve 100 from the inlet 2A and is discharged from the outlet 2B towards the downstream (FCV) equipment. Figure 2 for Figure 1 A partially enlarged view of section A shows details of the high-pressure hydrogen flow path 3 connecting the inlet 2A and the outlet 2B. Figure 2In the middle, the metal housing 2 has a main body side housing 2-1 and an exhaust side housing 2-2, and the main body side housing 2-1 and the exhaust side housing 2-2 are connected by a housing thread 22. The main body side housing 2-1 has an inlet 2A for high-pressure hydrogen, and the inlet 2A is connected to the valve actuation flow path 3C via an inlet side flow path 3A and a flow path space 3B. The flow path space 3B is connected to the exhaust port side flow path 3D formed in the main body side housing 2-1 and the exhaust port side flow path 3E formed in the exhaust side housing 2-2, and is connected to the exhaust port 2B for high-pressure hydrogen. A metal valve stem 1 is provided in the hollow part of the valve actuation flow path 3C and the flow path space 3B of the main body housing 2-1, and the end of the valve stem 1 ( Figure 2 A valve body 1AT with a tapered surface is formed at the upper end of the valve stem 1. A tapered surface is formed at the end of the flow path space 3B on the exhaust port side of the flow path 3D, and this tapered surface forms a valve seat 3AT. The valve seat 3AT and the valve body 1AT at the end of the valve stem 1 constitute a shut-off valve. Reference numeral 23 indicates an O-ring.

[0026] Figure 1 and 2 A shut-off valve in the open state is shown, wherein the conical surface of the valve seat 3AT, formed at the end of the exhaust port side flow path 3D located on the flow space 3B side, is separated from the conical surface at the end of the valve stem 1 constituting the valve body 1AT. On the other hand, Figure 3 and 4 A shut-off valve in the closed state is shown, with the conical surface of valve body 1AT seated on the conical surface constituting valve seat 3AT. Figure 2 When the shut-off valve is open, the high-pressure hydrogen supplied from the suction port 2A flows into the flow space 3B along the direction of arrow A1 via the suction port side flow path 3A. The high-pressure hydrogen flowing into the flow space 3B is discharged downstream from the discharge port 2B (towards the FCV side equipment: not shown) via the discharge port side flow path 3D and discharge port side flow path 3E formed in the discharge port side housing 2-2 along the direction of arrow A2.

[0027] For example, when the shut-off valve 100 is from Figure 3 and 4 The indicated off state changes to Figure 1 When in the open state, actuator driving fluid is supplied to the actuator driving fluid supply unit 12 via a supply device (not shown). When the driving fluid is supplied to the actuator driving fluid supply unit 12, the dimension of the actuator driving fluid supply unit 12 in the direction of the central axis (vertical direction) increases due to the fluid pressure, and the bottom 12A of the fluid supply unit and the spring pushing part 16 (transmission member 15) overcome the elastic repulsive force of the shaft support member actuation spring 18 and move downward in the direction of arrow D.

[0028] Since the spring-pressing part 16 is connected to the shaft 14A of the shaft support member at the connecting part 16A, the shaft support member 14 descends in the direction of arrow D when the spring-pressing part 16 descends. When the shaft support member 14 descends in the direction of arrow D, the valve stem actuation shaft 13, connected to the shaft support member 14 via the shaft support member groove 14B, also descends in the direction of arrow D. As the valve stem actuation shaft 13 descends in the direction of arrow D, the valve stem 1 also descends in the direction of arrow D via the spring support member 7. When the valve stem 1 descends, the valve body 1AT (conical surface) at the end of the valve stem 1... Figure 2 ) and the valve seat 3AT (conical surface) formed in the outlet-side flow path 3D. Figure 2 Separate, shut-off valve 100 opens.

[0029] Figure 3 The shut-off valve 100 is shown in the open position, allowing high-pressure hydrogen to flow. Figure 1 The state after that is closed. When from Figure 1 The status shown has switched to Figure 3 In the indicated state, the actuator drive fluid is discharged from the actuator drive fluid supply section 12. When the drive fluid is discharged and the pressure inside the actuator drive fluid supply section 12 decreases, the elastic repulsive force of the shaft support member actuation spring 18 causes the dimension of the actuator drive fluid supply section 12 in the central axis direction (vertical direction) to decrease. As a result, the bottom 12A of the fluid supply section and the spring push section 16 rise in the direction of arrow U.

[0030] Since the spring-pressing part 16 is connected to the shaft 14A at the connecting part 16A, when the spring-pressing part 16 rises, the shaft support member 14 rises in the direction of arrow U. When the shaft support member 14 rises in the direction of arrow U, the elastic repulsive force of the pressure regulating spring 44 acts on the valve stem actuation shaft joint 42, thereby causing the valve stem actuation shaft 13 to rise in the direction of arrow U. As the valve stem actuation shaft 13 rises in the direction of arrow U, the spring support member 7 pushes the spring 4 and the valve stem joint 6, causing the valve stem 1 to rise. As the valve stem 1 rises, the valve body 1AT (conical surface) at the end of the valve stem 1... Figure 2 It is located on the valve seat 3AT (conical surface) formed on the flow path 3D on the outlet side, and the shut-off valve 100 is closed.

[0031] For the shut-off valve 100 of the embodiment shown in the accompanying drawings, when from... Figure 3 After a predetermined time, the pushing force from the pressure regulating spring 44 decreases, and the elastic repulsive force of spring 4 disappears. This mechanism will refer to... Figure 4 Describe it. For example... Figure 3 As shown, even the tapered surface 1AT at the end of valve stem 1 Figure 2 The seat is placed on a conical surface 3AT (valve seat: Figure 2With the shut-off valve 100 closed, the high-pressure hydrogen flowing in from the suction port 2A will also flow through the suction port side flow path 3A and flow path space 3B, and enter the valve actuation flow path 3C. Figure 4 The diagram shows the state after a predetermined time since the shut-off valve 100 was closed, with high-pressure hydrogen gas flowing through the valve actuation flow path 3C into the pressure transmission chamber 5. The pressure of the incoming high-pressure hydrogen gas causes the valve stem actuation shaft 13 to move toward the unpressurized hollow receiving portion 46. Simultaneously, the spring support member 7, which engages with the valve stem actuation shaft 13, also descends in the direction of arrow D (the direction in which the valve body 1AT of the valve stem 1 moves away from the valve body 1AT).

[0032] When the flange 7A of the spring support member 7 descends a predetermined amount in the direction of arrow D, the spring 4 will move from the state of abutting the flange 7A (as shown in the image). Figure 3 As shown) moved to a state separated from flange 7A (e.g. Figure 4 (As shown). In other words, as flange 7A descends and separates from flange 7A, spring 4, which was lifted and compressed by flange 7A, is released from its compressed state and enters its extended state. As a result, the elastic repulsive force of spring 4 pushing against valve stem engagement 6 in the direction of arrow U disappears.

[0033] Therefore, the force required to close the valve is reduced due to the elastic repulsive force of spring 4, leaving only the pressure of the high-pressure hydrogen gas. Thus, by adjusting the pushing force on valve stem 1 according to the pressure of the working fluid, the pushing force can be reduced by adjusting the magnitude of the applied fluid pressure. Therefore, it is possible to avoid applying a force exceeding the force required to close the valve, thereby reducing damage to the valve body 1AT and valve seat 3AT.

[0034] Here, due to the up-and-down movement of the flange 7A of the spring support member 7, the position of the valve stem actuation shaft 13 in the central axis direction will move. However, since the valve stem 1 is connected to the valve stem joint 6, the up-and-down movement of the flange 7A of the spring support member 7 is not synchronized with the up-and-down movement of the valve stem 1. Therefore, Figure 3 and 4 The valve stem 1 is in the same position as the valve body 1AT at the end of the valve stem ( Figure 2 ) Keep seated in valve seat 3AT ( Figure 2 (Above). Although not shown, the shut-off valve can also be opened and closed using an electric motor instead of fluid pressure.

[0035] Next, we will refer to Figures 5 to 7 describe Figures 1 to 4 The sealing mechanism of the shut-off valve shown is required. To prevent leakage of high-pressure hydrogen from the sliding part of the valve stem 1, a multi-stage seal is necessary. Figures 1 to 4 The shut-off valve shown is equipped with a sealing mechanism. Figure 1 , 3 In section 4, a sealing mechanism 30 is provided at the sliding part of the valve stem actuation shaft 13. Figure 5In the middle, the sealing mechanism 30 is composed of units stacked in a multi-stage manner, consisting of an O-ring 35, a spare ring 34, a hollow cylindrical body-flange composite component 33, and a C-ring 32. In the shell 2 ( Figures 1 to 4 In the flow path 3 formed along the central axis direction (vertical direction) of the valve stem actuation shaft 13, the hollow portion 31 in which the valve stem actuation shaft 13 slides has multiple regions 31A (expanded diameter portions) with larger inner diameters. These regions 31A are formed discontinuously at equal intervals along the central axis direction. Figure 5 (Two examples are shown).

[0036] The C-ring 32 in the sealing mechanism 30, which is installed within the hollow portion 31 in which the valve stem actuation shaft 13 slides, has a portion of its annular portion cut off in the circumferential direction and is embedded in the expanded diameter portion 31A of the hollow portion 31. A hollow cylindrical / flange composite member 33 is arranged above the C-ring 32. The hollow cylindrical / flange composite member 33 has a hollow cylindrical region 33A (main body portion) extending along the central axis direction (vertical direction), and is inserted into and radially centered within the hollow portion 32A of the C-ring 32. A radially outwardly extending flange 33B is formed on the main body portion 33A of the hollow cylindrical / flange composite member 33, and a spare ring 34 and an O-ring 35 are disposed on the flange 33B. A spare ring 34 is also provided above the O-ring 35, and the O-ring 35 is sandwiched between the two spare rings 34 from above and below. The sealing mechanism 30 is composed of multiple units (assemblies C32-35) stacked together. Each unit consists of an O-ring 35, two spare rings 34, a hollow cylinder-flange composite component 33, and a C-ring 32. Figure 5 The diagram shows the state of the C32-35 assembly stacked in two stages.

[0037] By adopting the above configuration, without increasing the inner diameter of the sliding portion (hollow part) of the valve stem actuation shaft 13, multi-stage sealing can be easily arranged by forming an enlarged diameter portion 31A into which the C-ring 32 can be embedded, and high-pressure hydrogen leakage can be reliably prevented. The sealing mechanism 30 can be arranged at any position where the valve stem 1 slides, except where the valve stem actuation shaft 13 slides. Although not shown in the figure, a cup-shaped seal can be used instead of the O-ring 35. In this case, it is preferable to arrange the cup-shaped seal in such a way that the opening direction of the cup-shaped seal is Figure 1 , 3 And the upward direction in 4.

[0038] Figure 6 and 7The hollow cylindrical / flange composite component 33 and the C-ring 32 are shown. The spare ring 34 is made of resin and is designed to prevent a portion of the O-ring 35 from protruding under high pressure and entering the gap with the inner wall (so-called "O-ring protrusion"), which could cause the O-ring 35 to break at the point of entry.

[0039] Figure 6 The hollow cylindrical / flange composite component 33 shown is made of metal and has a hollow cylindrical body 33A extending along the central axis (vertical direction) and a flange 33B located above the body 33A and extending radially outward. When the sealing mechanism 30 is installed, the hollow cylindrical portion of the body 33A is inserted into and embedded in the hollow portion 32A of the C-ring 32. This prevents the C-ring 32 from contracting radially inward. When the sealing mechanism 30 is installed, a spare ring 34 and an O-ring 35 are positioned on the radially outward flange 33B.

[0040] Figure 7 The C-shaped ring 32 shown is made of metal and is C-shaped. A portion of the ring is cut off in the circumferential direction, and it has multiple (four in the illustrated embodiment) slits 32B formed at approximately equal intervals in the circumferential direction. By forming the slits 32B, the C-shaped ring 32 can easily expand radially outward, and the body 33A of the hollow cylindrical-flange composite member 33 can be easily inserted into the hollow portion 32A at the radial center of the C-shaped ring 32. The slits 32B can be formed in fewer than three locations or in five or more locations (e.g., two to six locations). The C-shaped ring 32 is oriented along the central axis ( Figure 1 , 3 The vertical dimension TS of the C-ring 32 (as described in section 4) is set to be greater than the radial dimension TR. The ratio of the radial dimension TR to the central axis dimension TS of the C-ring 32 is set in the range of 1:1 to 1:10. This is because if the axial dimension TS of the C-ring 32 is thicker, the C-ring 32 is less likely to shrink in the radial direction. The central axis dimension TS of the C-ring 32 is set to a value that can resist shear forces acting along the central axis. The radial thickness of the C-ring 32 is thinner at the slit 32B. As described above, the body 33A of the hollow cylindrical / flange composite member 33 is inserted into the hollow portion 32A of the C-ring 32, and the flange 33B of the hollow cylindrical / flange composite member 33 is arranged near and above the C-ring 32, covering the C-ring 32. Therefore, even if the radial thickness is thinned due to the slit, there is no risk of impairing the function of the sealing mechanism 30.

[0041] Figure 8 It shows Figures 1 to 7 A modified example of the illustrated embodiment. Figures 1 to 7 In the shut-off valve 100 of the illustrated embodiment, a spring 4 is provided in the pressure transmission chamber 5, but... Figure 8In the modified example shown, no spring is included. Figure 8 In the modified example shown, spring 4 is not provided. However, when fluid flows into the shut-off valve 100, fluid pressure is applied to the pressure transmission chamber 5-1 due to the presence of the sealing mechanism 30. Since the fluid pressure is applied to the upper part of the valve stem actuation shaft 13 that pushes the valve stem 1, a force is applied against the pressure regulating spring 44, thereby reducing the pushing force acting on the valve stem 1. Therefore, the pushing force acting on the valve stem 1 will not become an excessive pushing force formed by the pressure from the actuator 11 plus the fluid pressure, thereby suppressing damage to the valve seat 3AT and the valve body 1AT. Figure 8 Other configurations and effects of the modified example Figures 1 to 7 The embodiments are the same.

[0042] It should be noted that the embodiments shown are merely examples and are not intended to limit the technical scope of the present invention.

[0043] [Symbol Explanation]

[0044] 1. Valve stem

[0045] 1AT valve body

[0046] 2. Shell

[0047] 3 flow path

[0048] 3AT valve seat

[0049] 4 springs

[0050] 5.5-1 Pressure Transmission Chamber

[0051] 6. Valve stem joint

[0052] 7. Spring support components

[0053] 7A Flange (Flange of spring support member)

[0054] 10 Valve closing mechanism

[0055] 11 Actuators

[0056] 12 Actuator-driven fluid supply section

[0057] Bottom of 12A Fluid Supply Section

[0058] 13 Valve stem actuation shaft

[0059] 14 Shaft support components

[0060] 15 Transmission components

[0061] 16 Spring Push Part

[0062] 20 Elastic repulsion elimination device

[0063] 30 Sealing mechanism

[0064] 31A Areas with larger inner diameters in the flow path

[0065] 32. C-shaped component (C-ring)

[0066] 32A: The hollow part of the C-shaped ring

[0067] 32B C-ring gap

[0068] 33 Hollow cylindrical / flange composite components

[0069] The hollow cylindrical region (main body) of the 33A hollow cylindrical-flange composite component.

[0070] 33B Flange of hollow cylindrical-flange composite component

[0071] 34 Spare ring

[0072] 35 O-ring

[0073] 40 Valve stem actuation shaft housing device

[0074] 50 Valve closing force adjustment mechanism

[0075] 100 Stop valve.

Claims

1. A shut-off valve, comprising: A housing having a fluid flow passage extending along the central axis of the housing; A valve stem, which is disposed within the flow passage and extends along the central axis; A valve body formed at the end of the valve stem; A valve seat, formed in the housing near the end of the flow passage; and A valve closing mechanism that presses the valve body against the valve seat, wherein the valve closing mechanism consists of an actuator and a valve closing force adjusting mechanism; The valve closing force adjustment mechanism includes a pressure transmission chamber and a valve stem actuator shaft receiving device; The valve stem actuation shaft receiving device includes a valve stem actuation shaft that engages with the valve stem and is moved by the actuator along the central axis direction, and a pressure adjusting spring disposed between the valve stem actuation shaft and the actuator; and The valve stem actuation shaft is equipped with a sealing mechanism to prevent fluid from flowing into the actuator side.

2. The shut-off valve according to claim 1 further includes a spring disposed in the pressure transmission chamber between the valve stem and the valve stem actuation shaft.

3. The shut-off valve according to claim 1 or 2, wherein, The actuator includes: A shaft support member that engages with the valve stem actuation shaft; A transmission component connected to the shaft support component; The actuator drive fluid supply section supplies or discharges actuator drive fluid to it; and A shaft support member actuation spring is disposed at a position facing the actuator drive fluid supply section and engages with the transmission member, wherein the transmission member moves along the central axis direction by supplying or discharging drive fluid to the actuator drive fluid supply section and the shaft support member actuation spring.

4. The shut-off valve according to claim 1 or 2, further comprising a sealing mechanism disposed in a flow passage formed in the direction of the central axis of the housing and through which the valve stem extends, the sealing mechanism comprising: A C-shaped component is formed by cutting off a portion of the circumference of the ring; as well as A component having a hollow cylindrical region and a flange, the flange extending radially outward in the region along the valve body side in the direction of the central axis, the hollow cylindrical region being inserted into the central hollow portion of the C-shaped component, wherein a spare ring and an O-ring are disposed on the flange, and the combination of the C-shaped component, the component having the hollow cylindrical region and the flange, and the spare ring and O-ring disposed on the flange of the component having the hollow cylindrical region and the flange are arranged in a multi-stage manner.

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