Shutoff 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

(19) State Intellectual Property Office (12) Invention Patent Application (10) Application Publication Number (43) Application Publication Date (21) Application Number 202511024842.5 (22) Application Date 2025.07.24 (30) Priority Data 2024-119248 2024.07.25 JP (71) Applicant: Tatsuno Co., Ltd. Address: Japan (72) Inventor: Masahiro Takezawa (74) Patent Agency: Beijing Zhongzi Law Firm 11247 Patent Attorneys: Lirong Ma, Peng Wu (51) Int.Cl. F16K 1 / 32 (2006.01) F16K 1 / 36 (2006.01) F16K 41 / 04 (2006.01) F16K 47 / 00 (2006.01) F16K 17 / 06 (2006.01) (54) Invention Title: Shut-off Valve (57) Abstract: A shut-off valve capable of reducing wear on metal valve bodies is provided. The shut-off valve of the present invention includes: a housing in which a flow path for a working fluid (e.g., high-pressure hydrogen) extending along the central axis of the housing is formed; a valve stem disposed within the flow path and extending along the central axis; a valve body formed at the end of the valve stem; a valve seat formed near the end of the flow path in the housing; and a valve closing mechanism for pressing the valve body against the valve seat, including an actuator and a valve closing force adjusting mechanism, the actuator being disposed at the end of the housing opposite to the valve seat in the central axis direction and having the function of moving the valve stem along the central axis direction, the valve closing force adjusting mechanism including an elastic repulsion elimination device and a valve stem actuation shaft receiving device, the elastic repulsion elimination device having the function of eliminating the elastic repulsion of the valve stem engagement actuation spring, and the valve stem actuation shaft receiving device having the function of eliminating the elastic repulsion of the pressure regulating spring. Claims 1 page, Description 7 pages, Drawings 7 pages, CN 121408461 A 2026.01.27 CN 1 21 40 84 61 A 1. A shut-off valve, comprising: a housing having a fluid flow passage extending along a central axis of the housing; a valve stem disposed within the flow passage and extending 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 pressing the valve body against the valve seat, wherein the valve closing mechanism comprises an actuator and a valve closing force adjusting mechanism; the valve closing force adjusting 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 regulating spring disposed between the valve stem actuation shaft and the actuator; and the valve stem actuation shaft is provided with a sealing mechanism to prevent fluid from flowing into the actuator side.2. The shut-off valve of claim 1, further comprising a spring disposed in the pressure transmission chamber between the valve stem and the valve stem actuation shaft. 3. The shut-off valve of claim 1 or 2, wherein the actuator comprises: a shaft support member engaged with the valve stem actuation shaft; a transmission member connected to the shaft support member; an actuator drive fluid supply portion for supplying or discharging actuator drive fluid thereto; and a shaft support member actuation spring disposed at a position facing the actuator drive fluid supply portion and engaged 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 portion and the shaft support member actuation spring. 4. The shut-off valve according to claim 1 or 2 further includes a sealing mechanism disposed in a flow passage formed in the central axis direction of the housing and through which the valve stem extends, the sealing mechanism comprising: a member formed into a C-shape by cutting off a portion of the circumferential direction of a ring; and a member having a hollow cylindrical region and a flange, the flange extending radially outward in the region on the valve body side in the central axis direction, the hollow cylindrical region being inserted into the central hollow portion of the C-shaped member, wherein a spare ring and an O-ring are disposed on the flange, and the combination of the C-shaped member, the member having the hollow cylindrical region and the flange, and the spare ring and O-ring disposed on the flange of the member having the hollow cylindrical region and the flange is arranged in a multi-stage manner. Claims 1 / 1 page 2 CN 121408461 A Shut-off Valve Technical Field

[0001] The present 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 Art

[0002] In conventional high-pressure fluid shut-off valves (e.g., high-pressure hydrogen shut-off valves), resin valve bodies have good sealing performance at low pressures but poor durability at high pressures. In contrast, when using metal valve bodies, although there are no issues with strength or durability, there is a problem with poor sealing performance at low pressures. To solve the low-pressure sealing problem of metal valve bodies, pre-pressing the metal valve body against the valve seat with a spring is an effective method. However, under high pressure, the huge pushing force of the high-pressure gas and the elastic repulsive force of the spring act simultaneously on the valve body, which leads to wear of the metal valve body.

[0003] Another prior art proposes a shut-off valve whose sliding part improves sliding performance, sealing performance, and durability (see JP6972506B). Although this technology is practical, it does not solve the following problem: in shut-off valves that use 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.

[0005] The present invention addresses the problems existing in the prior art described above, 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 the high-pressure gas and the elastic repulsive force of the spring from acting simultaneously on the valve body when the valve is closed, thus reducing wear on the metal valve body.

[0006] [Means for Solving the Problem]

[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 within 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 part 16) connected to the shaft support member 14; an actuator drive fluid supply part 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 provided at a position opposite to the actuator drive fluid supply part 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 part 12 and the shaft support member actuation spring 18. Instruction manual, page 1 / 7, CN 121408461 A

[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) having 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 member 33 is inserted into the center of the C-shaped member 32.The hollow part 32A is provided, and a spare ring 34 and an O-ring 35 are installed on the flange 33B. The assembly (unit) is provided in multiple stages, consisting of a C-shaped member (32: C-ring), a member 33 having a hollow cylindrical region 33A and a flange 33B, and a spare ring 34 and an O-ring 35 installed on the flange 33B of the member 33 having a hollow cylindrical region 33A and a flange 33B. Here, preferably, in the flow passage 3 extending therein, a region 31A with a larger inner diameter is formed intermittently at equal intervals along the axial direction, and the C-shaped member (32: C-ring) is embedded in the region 31A.

[0010] Effects of the Invention

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

[0012] FIG1 is a cross-sectional view showing the open state of a shut-off valve according to an embodiment of the present invention.

[0013] FIG2 is a partially enlarged cross-sectional view of part A in FIG1. ​​

[0014] FIG3 is a cross-sectional view showing the state immediately after the shut-off valve shown in FIG1 is closed.

[0015] FIG4 is a cross-sectional view showing the state after a predetermined time has elapsed since the shut-off valve shown in FIG1 was closed.

[0016] FIG5 is a cross-sectional view showing the sealing mechanism in the illustrated embodiment.

[0017] FIG6 is a perspective view of the hollow cylindrical body-flange composite member used in the sealing mechanism shown in FIG5.

[0018] FIG7 is a perspective view of the C-ring used in the sealing mechanism shown in FIG5.

[0019] FIG8 is a cross-sectional view showing a modified embodiment of the present invention. Detailed Description

[0020] An embodiment of the present invention will now be described with reference to the accompanying drawings. First, an embodiment of the shut-off valve according to the present invention will be described with reference to FIGS. 1 to 4. 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. FIGS. 1 and 2 show the shut-off valve 100 in the open state. In FIG. 1, the shut-off valve 100 has: a housing 2 in which a central axis is formed (FIG. 1)A high-pressure hydrogen flow path 3 extending vertically in the flow path 3; a valve stem 1 disposed within the flow path 3 and extending along the central axis; a valve body 1AT (conical portion: see FIG. 2) formed at the front end of the valve stem 1 (the upper end of the valve stem 1 in FIG. 1); a valve seat 3AT (conical portion: see FIG. 2) formed near the end of the flow path 3 within the housing 2 (the lower end of the flow path 3D in FIG. 2); and a valve closing mechanism 10 that presses the valve body 1AT against the valve seat 3AT. Details of part A in FIG. 1, including the valve body 1AT formed on the valve stem 1 and the valve seat 3AT formed near the end of the flow path 3, will be described later with reference to FIG. 2. Specification 2 / 7 pages 4 CN 121408461 A

[0021] In FIG. 1, the valve closing mechanism 10 includes an actuator 11 and a valve closing force adjustment mechanism 50. Actuator 11 is located near the end of flow path 3 on the opposite side of valve seat 1AT in the central axis direction (lower in FIG. 1) and has the function of moving valve stem 1 in the central axis direction. Valve closing adjustment mechanism 50 has elastic repulsion elimination device 20, valve stem actuation shaft receiving device 40 and sealing mechanism 30. Actuator 11 has actuator drive fluid supply section 12 for supplying or discharging actuator drive fluid (e.g., high-pressure air, high-pressure nitrogen), transmission member 15 and shaft support member actuation spring 18. Transmission member 15 has fluid supply section bottom 12A and spring pressing section 16 and has the function of transmitting actuator drive fluid supplied or discharged by actuator drive fluid supply section 12 to shaft support member 14 and converting it into movement of shaft support member 14 in the central axis direction. Shaft support member actuation spring 18 is located below transmission member 15 to surround shaft 14A of shaft support member 14, and shaft 14A is connected to spring pressing section 16 via 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. In FIG1, drive fluid is supplied to actuator drive fluid supply section 12 via a supply device (not shown), and the dimension of actuator drive fluid supply section 12 in the central axis direction (vertical direction) is larger than the dimension in FIG3 and FIG4. In the state of FIG3 and 4 described later, drive fluid is discharged from actuator drive fluid supply section 12 via a discharge device (not shown), and the dimension of actuator drive fluid supply section 12 in the central axis direction (vertical direction) is smaller than the dimension in FIG1. ​​Reference numerals 2-3 indicate actuator side housing.

[0022] Shaft 14A of shaft support member 14 is disposed within actuator side housing 2-3. Shaft support member 14 is configured to have a diameter larger than shaft 14A and supports 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 the shut-off valve 100 shown in FIG. 1 is open, the lower end of the shaft 14A abuts against the stop member 17 at the lower end of the actuator 11. On the other hand, when the shut-off valve 100 shown in FIG. 3 is closed, the lower end of the shaft 14A separates from the stop member 17. In the valve stem actuation shaft receiving device 40, which is 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 provided 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 has a pressure transmission chamber 5, a spring 4, and a spring support member 7. The pressure transmission chamber 5 accommodates 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 is provided with 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 the valve stem engagement portion 6. The pressure transmission chamber 5 also accommodates a 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 accommodates the end (upper end) of the valve stem actuation shaft 13 located on the valve stem 1 side, and the valve stem actuation shaft 13 is connected to the valve stem 1 via the spring support member 7 and the valve stem joint 6.

[0024] High-pressure hydrogen from the filling device (not shown) flows into the pressure transmission chamber 5 through the inlet 2A of the housing 2, the inlet-side flow path 3A (see FIG. 2), and the valve actuation flow path 3C (see FIG. 2). Therefore, the pressure of the high-pressure hydrogen 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 accommodating portion 46.

[0025] In FIG. 1, 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) device. Figure 2 is a partially enlarged view of part A in Figure 1, showing details of the high-pressure hydrogen flow path 3 connecting the inlet 2A and the outlet 2B (see page 3 / 7 of specification CN 121408461 A). In Figure 2, the metal casing 2 has a main body side casing 2-1 and an outlet side casing 2-2, and the main body side casing 2-1 and...The exhaust-side housing 2-2 is connected via a housing thread 22. The main body-side housing 2-1 has an inlet 2A for high-pressure hydrogen, and the inlet 2A communicates with the valve actuation flow path 3C via an inlet-side flow path 3A and a flow path space 3B. The flow path space 3B communicates with the exhaust-side flow path 3D formed in the main body-side housing 2-1 and the exhaust-side flow path 3E formed in the exhaust-side housing 2-2, and also communicates with the exhaust port 2B for high-pressure hydrogen. A metal valve stem 1 is provided in the hollow portion of the valve actuation flow path 3C and the flow path space 3B of the main body housing 2-1, and a valve body 1AT with a tapered surface is formed at the end of the valve stem 1 (the upper end in FIG. 2). A tapered surface is formed at the end of the exhaust-side flow path 3D on the flow path space 3B side, 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] Figures 1 and 2 show the shut-off valve in the open state, where 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 forming the valve body 1AT. On the other hand, Figures 3 and 4 show the shut-off valve in the closed state, where the conical surface of the valve body 1AT sits on the conical surface forming the valve seat 3AT. In Figure 2, when the shut-off valve is open, high-pressure hydrogen supplied from the intake port 2A flows into the flow space 3B along the direction of arrow A1 via the intake port side flow path 3A. The high-pressure hydrogen flowing into the flow space 3B is discharged from the outlet 2B downstream (towards the FCV side device: not shown) along the direction of arrow A2 via the outlet side flow path 3D and outlet side flow path 3E formed in the outlet side housing 2-2.

[0027] For example, when the shut-off valve 100 changes from the closed state shown in Figures 3 and 4 to the open state shown in Figure 1, actuator driving fluid is supplied to the actuator driving fluid supply section 12 via a supply device (not shown). When the driving fluid is supplied to the actuator driving fluid supply section 12, due to the fluid pressure, the dimension of the actuator driving fluid supply section 12 in the direction of the central axis (vertical direction) increases, and the bottom 12A of the fluid supply section and the spring push section 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 push section 16 is connected to the shaft 14A of the shaft support member at the connection section 16A, the shaft support member 14 descends in the direction of arrow D when the spring push section 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, Figure 2) at the end of the valve stem 1 and the valve seat 3AT (conical surface) formed in the outlet-side flow path 3D...Surface (Fig. 2) separated, shut-off valve 100 open.

[0029] Fig. 3 shows the shut-off valve 100 closed after being opened and allowing high-pressure hydrogen flow (Fig. 1). When switching from the state shown in Fig. 1 to the state shown in Fig. 3, actuator drive fluid is discharged from actuator drive fluid supply section 12. When the drive fluid is discharged and the pressure in actuator drive fluid supply section 12 decreases, the elastic repulsive force of shaft support member actuation spring 18 causes the dimension of actuator drive fluid supply section 12 in the central axis direction (up and down direction) to decrease. As a result, fluid supply section bottom 12A and spring push section 16 rise in the direction of arrow U.

[0030] Since spring push section 16 is connected to shaft 14A at connection section 16A, shaft support member 14 rises in the direction of arrow U when spring push section 16 rises. 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 engagement 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 engagement 6, causing the valve stem 1 to rise. As the valve stem 1 rises, the valve body 1AT (conical surface, FIG. 2) at the end of the valve stem 1 is located on the valve seat 3AT (conical surface) formed on the outlet-side flow path 3D, and the shut-off valve 100 is closed.

[0031] For the shut-off valve 100 of the embodiment shown in the figures, after a predetermined time has elapsed from the state shown in FIG. 3, the pushing force from the pressure regulating spring 44 decreases, and the elastic repulsive force of the spring 4 disappears. This mechanism will be described with reference to FIG. 4. As shown in Figure 3, page 4 / 7 of the specification (CN 121408461 A), even if the conical surface 1AT (Figure 2) at the end of the valve stem 1 is placed on the conical surface 3AT (valve seat: Figure 2) and the shut-off valve 100 is closed, the high-pressure hydrogen gas flowing in from the suction port 2A will flow through the suction port side flow path 3A and flow path space 3B, and enter the valve actuation flow path 3C. Figure 4 shows the state after a predetermined time since the shut-off valve 100 was closed, with the high-pressure hydrogen gas that has flowed through the valve actuation flow path 3C flowing into the pressure transmission chamber 5. The pressure of the flowing high-pressure hydrogen gas causes the valve stem actuation shaft 13 to move toward the unpressurized hollow receiving portion 46. At the same time, 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 against the flange 7A (as shown in FIG. 3) to the state of being separated from the flange 7A (as shown in FIG. 4). In other words, as the flange 7A descends and separates from the flange 7A, the spring 4, which was lifted and compressed by the flange 7A, is released from the compressed state and enters the extended state. As a result, the elastic repulsive force of the spring 4 pushing against the valve stem joint 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 the spring 4, leaving only the pressure of the high-pressure hydrogen. Thus, by adjusting the pushing force on the valve stem 1 according to the pressure of the working fluid, the pushing force can be reduced by 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 the 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, but 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, the position of the valve stem 1 is the same in Figures 3 and 4, and the conical surface of the valve body 1AT at the end of the valve stem (Figure 2) remains seated on the valve seat 3AT (Figure 2). Although not shown, the shut-off valve can also be opened and closed using an electric motor instead of using fluid pressure.

[0035] Next, the sealing mechanism of the shut-off valve shown in Figures 1 to 4 will be described with reference to Figures 5 to 7. To prevent high-pressure hydrogen from leaking from the sliding part of the valve stem 1, multi-stage sealing is required; therefore, the shut-off valves shown in Figures 1 to 4 are equipped with sealing mechanisms. In Figures 1, 3, and 4, a sealing mechanism 30 is provided at the sliding part of the valve stem actuation shaft 13. In Figure 5, the sealing mechanism 30 is constructed by stacking units consisting of an O-ring 35, a spare ring 34, a hollow cylindrical-flange composite component 33, and a C-ring 32 in a multi-stage manner. In the flow path 3 formed along the central axis (vertical direction) of the housing 2 (Figures 1 to 4), in which the valve stem actuation shaft 13 extends, 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 intermittently at equal intervals along the central axis (two locations are shown in the example in Figure 5).

[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 shape in which a portion of the annular portion in the circumferential direction is cut off, and is embedded in the expanded diameter portion 31A of the hollow portion 31. A hollow cylindrical body / flange composite member 33 is arranged above the C-ring 32. The hollow cylindrical body / flange composite member 33 has a hollow cylindrical region 33A (main body portion) extending along the central axis direction (vertical direction), and the hollow cylindrical body / flange composite member 33 is inserted into and arranged radially at the center of the C-ring 32 in the hollow portion 32A. A radially outwardly extending flange 33B is formed on the main body portion 33A of the hollow cylindrical body / 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 stacked units (assemblies C32-35), each unit consisting of an O-ring 35, two spare rings 34, and a...The assembly consists of a hollow cylinder-flange composite component 33 and a C-ring 32. Figure 5 shows the assembly C32-35 stacked in two stages.

[0037] By adopting the above configuration, without increasing the inner diameter of the sliding part (hollow portion) of the valve stem actuation shaft 13, a multi-stage seal 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, rather than at the position where the valve stem actuation shaft 13 slides. Although not shown on page 5 / 7 of the specification 7 CN 121408461 A, 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 the upward direction in Figures 1, 3 and 4.

[0038] Figures 6 and 7 show the hollow cylinder / flange composite component 33 and the C-ring 32. 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] The hollow cylindrical / flange composite component 33 shown in FIG6 is made of metal and has a hollow cylindrical body 33A extending along the central axis direction (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 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, the spare ring 34 and the O-ring 35 are positioned on the radially outward flange 33B.

[0040] The C-shaped ring 32 shown in FIG. 7 is made of metal and is C-shaped. A portion of the ring is cut off in the circumferential direction, and it has a plurality of slits 32B (four in the illustrated embodiment) 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 of 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 dimension TS of the C-shaped ring 32 in the central axial direction (the vertical direction in FIG. 1, 3, and 4) is set to be greater than the radial dimension TR. The ratio of the radial dimension TR to the central axial dimension TS of the C-shaped ring 32 is set in the range of 1:1 to 1:10. This is because if the axial dimension TS of the C-shaped ring 32 is thicker, the C-shaped 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 capable of resisting 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 main hollow cylindrical / flange composite component 33...Body 33A is inserted into the hollow portion 32A of C-ring 32, and the flange 33B of the hollow cylindrical body / flange composite member 33 is arranged near and above C-ring 32, covering C-ring 32. Therefore, even if the radial thickness is thinned due to the slit, there is no risk of impairing the function of sealing mechanism 30.

[0041] FIG8 shows a modification of the embodiment shown in FIG1 to 7. In the shut-off valve 100 of the embodiments shown in FIG1 to 7, a spring 4 is provided in the pressure transmission chamber 5, but in the modification shown in FIG8, no spring is provided. In the modification shown in FIG8, no spring 4 is provided, but when fluid flows into shut-off valve 100, fluid pressure is applied to pressure transmission chamber 5-1 due to the presence of sealing mechanism 30. Since the fluid pressure is applied to the upper part of valve stem actuation shaft 13 of valve stem 1, a force is applied against pressure regulating spring 44, thereby reducing the pushing force acting on valve stem 1. Therefore, the thrust acting on valve stem 1 will not become an excessive thrust formed by the pressure from actuator 11 plus fluid pressure, thereby suppressing damage to valve seat 3AT and valve body 1AT. Other configurations and effects of the modified example in FIG8 are the same as those of the embodiments in FIG1 to 7.

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

[0043] [Symbol Explanation]

[0044] 1 Valve stem

[0045] 1AT Valve body

[0046] 2 Housing

[0047] 3 Flow path

[0048] 3AT Valve seat

[0049] 4 Spring

[0050] 5, 5-1 Pressure transmission chamber

[0051] 6 Valve stem joint instruction manual 6 / 7 pages 8 CN 121408461 A

[0052] 7 Spring support member

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

[0054] 10 Valve closing mechanism

[0055] 11 Actuator

[0056] 12 Actuator driven fluid supply part

[0057] 12A Bottom of fluid supply part

[0058] 13 Valve stem actuation shaft

[0059] 14 Shaft support member

[0060] 15 Transmission component

[0061] 16 Spring pressing part

[0062] 20 Elastic repulsion elimination device

[0063] 30 Sealing mechanism

[0064] 31A Area with larger inner diameter in the flow path

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

[0066] 32A: Hollow part of C-ring

[0067] 32B C-ring gap

[0068] 33 Hollow cylindrical body / flange composite component

[0069] 33A Hollow cylindrical area (main body) of hollow cylindrical body-flange composite component

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

[0071] 34 Spare ring

[0072] 35 O-ring

[0073] 40Valve stem actuation shaft receiving device

[0074] 50 Valve closing force adjusting mechanism

[0075] 100 Shut-off valve. Instruction Manual 7 / 7 Page 9 CN 121408461 A Figure 1 Instruction Manual Figure 1 / 7 Page 10 CN 121408461 A Figure 2 Instruction Manual Figure 2 / 7 Page 11 CN 121408461 A Figure 3 Instruction Manual Figure 3 / 7 Page 12 CN 121408461 A Figure 4 Instruction Manual Figure 4 / 7 Page 13 CN 121408461 A Figure 5 Figure 6 Instruction Manual Figure 5 / 7 Page 14 CN 121408461 A Figure 7 Instruction Manual Figure 6 / 7 Page 15 CN 121408461 A Figure 8 Instruction Manual Figure 7 / 7 Page 16 CN 121408461 A Abstract The invention provides a shutoff 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 actuatorprovided 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.

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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