Valve

Abstract

To provide a valve for controlling high-pressure fluid in which a valve element is not damaged even if an adiabatic compression phenomenon occurs.SOLUTION: A valve 1 includes a valve body 10 having an inlet passage 11, an outlet passage 12, and a valve chamber 13 communicating the inlet passage with the outlet passage, and a valve element 20 abutting on and separating from a valve seat 14 formed in an opening part 15 opened to the valve chamber of the inlet passage, and the valve element includes a columnar body part 21, and an annular abutting part 24 arranged in a step part 23 or a recessed part 22 formed on an outer peripheral side of an end part on the valve seat side of the body part and abutting on the valve seat.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to valves, and more particularly to valves for high-pressure fluids. [Background technology]

[0002] The valve 100 shown in FIG. 6 is the valve described in Patent Document 1, in which a valve stem 107 moves up and down by operating a handle 108, which moves a valve element 104 below a diaphragm 106 up and down, and controls the flow of fluid flowing through an inlet passage 102 and an outlet passage 103 by an abutment portion 105 that abuts against or separates from a valve seat 109 formed on a valve body 101.

[0003] Valve 200 shown in Fig. 7 has a similar structure to the valve shown in Fig. 6, but is used particularly as a valve for controlling high-pressure fluid. In valve 200, valve element 220 has main body portion 221 and abutment portion 224, and abutment portion 224 is fixed by crimping to a recess 222 formed in the lower end of main body portion 221, and abutment portion 224 controls the fluid by abutting against and separating from a valve seat. [Prior art documents] [Patent documents]

[0004] Unexamined Utility Model Publication No. 54-6623 Summary of the Invention [Problem to be solved by the invention]

[0005] When the valve is closed and high-pressure gas is introduced into the valve inlet passage, adiabatic compression occurs inside the valve. Adiabatic compression is the compression of gas without any heat coming in or out from the outside, and the temperature of the gas rises due to adiabatic compression. The gas that was originally inside the piping is suddenly compressed by the introduced high-pressure gas, resulting in adiabatic compression, and the temperature of the gas near the valve body rises. The temperature rise of the gas due to this adiabatic compression can reach temperatures of over 700°C in some locations with high-pressure gas of 10 MPa, for example. In valves that use resin for the valve body, the resin can be damaged by the rise in gas temperature due to adiabatic compression. In particular, if the gas is oxygen, the resin can be burned.

[0006] The present invention has been made in view of the above points, and an object of the present invention is to provide a valve for controlling a high-pressure fluid, the valve body of which is not damaged even when an adiabatic compression phenomenon occurs. [Means for solving the problem]

[0007] The present invention (1) is a valve comprising: a valve body having an inlet passage, an outlet passage, and a valve chamber communicating the inlet passage with the outlet passage; and a valve disc abutting against and separating from a valve seat formed in an opening of the inlet passage that opens into the valve chamber, wherein the valve disc comprises a metal columnar main body portion and a resin annular abutment portion that is disposed in a step or recess formed on the outer periphery of the valve seat side end of the main body and abuts against the valve seat.

[0008] In the valve of present invention (1), the valve body comprises a metal columnar main body and a resin annular abutment portion that is located in a step or recess formed on the outer periphery of the end of the main body on the valve seat side and abuts against the valve seat. Even if the abutment portion is made of resin, even if the high-pressure gas becomes hot due to adiabatic compression caused by the introduction of high-pressure gas, since there is no abutment portion in the center of the valve body, the abutment portion is not affected by the hot high-pressure gas and is less likely to be damaged.

[0009] The present invention (2) is the valve of the present invention (1), characterized in that the valve seat side end face of the main body and the opening of the inlet passage have the same shape and phase, and when the valve is closed, the valve body and the main body prevent the abutment part from coming into contact with the inflow gas.

[0010] In the valve of present invention (2), the valve seat side end face of the main body and the opening of the inlet passage have the same shape and phase, and when the valve is closed, the valve body and the main body prevent the abutment portion from coming into contact with the inflow gas. Because the abutment portion does not come into direct contact with the high-temperature inflow gas, it is less susceptible to the effects of the high-temperature high-pressure gas and is less likely to be damaged.

[0011] The present invention (3) is the valve of the present invention (1), characterized in that the valve seat side end face of the main body surrounded by the step or the recess is larger than the opening of the inlet passage, and when the valve is closed, the valve body and the main body prevent the abutment part from coming into contact with the inflow gas.

[0012] In the present invention (3), the valve seat side end face of the main body surrounded by the step or the recess is larger than the opening of the inlet passage, and when the valve is closed, the valve body and the main body prevent the abutment portion from coming into contact with the inflow gas. Because the abutment portion does not come into direct contact with the high-temperature inflow gas, the abutment portion is less susceptible to the effects of the high-temperature high-pressure gas and is less likely to be damaged.

[0013] The present invention (4) is a valve according to any one of the present inventions (1) to (3), characterized in that the inner wall of the step portion or the recess is formed to be inclined inward, and the abutment portion is press-fitted into the step portion or the recess.

[0014] The present invention (4) is characterized in that the inner wall of the step or recess is formed to be inclined inward, and the abutment portion is press-fitted into the step or recess, which reduces the possibility of fluid leakage from a gap between the valve body and the abutment portion.

[0015] The present invention (5) is the valve according to any one of the present inventions (1) to (3), wherein a recess is formed in the valve seat side end of the main body.

[0016] In the present invention (5), a recess is formed at the valve seat side end of the main body, so that the point where the temperature rises the most due to adiabatic compression is the bottom of the recess, and the distance between this bottom and the abutment part is long, so that the temperature of the abutment part can be lowered further during adiabatic compression. [Effects of the Invention]

[0017] According to the present invention, it is possible to provide a valve that controls a high-pressure fluid and whose valve body is not damaged even when an adiabatic compression phenomenon occurs. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 2 is an enlarged partial cross-sectional view of the entire valve according to the first embodiment of the present invention. [Figure 2] FIG. 10 is a partially enlarged cross-sectional view of the entire valve according to a second embodiment of the present invention. [Figure 3] FIG. 10 is a partially enlarged cross-sectional view of the entire valve according to a third embodiment of the present invention. [Figure 4] FIG. 10 is a partially enlarged cross-sectional view of the entire valve according to a fourth embodiment of the present invention. [Figure 5] FIG. 10 is a partially enlarged cross-sectional view of the entire valve according to a fifth embodiment of the present invention. [Figure 6] FIG. 1 is an enlarged cross-sectional view of a conventional valve disclosed in Patent Document 1. [Figure 7] FIG. 1 is a partially enlarged cross-sectional view of a valve for controlling high-pressure fluid similar to the valve described in the patent document. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the following embodiments are essentially preferred examples and are not intended to limit the scope of the present invention, its applications, or its uses.

[0020] 1(A) is a partial cross-sectional view of an entire valve according to a first embodiment of the present invention, with the valve 1 mainly comprising a valve body 10, a handle 17, and a valve element 20. The valve body 10 is formed with an inlet passage 11, an outlet passage 12, and a valve chamber 13. A valve seat 14 is formed above an opening 15 of the inlet passage 11. A diaphragm 16 is disposed below the handle 17 for sealing purposes.

[0021] The valve element 20 comprises a metal main body 21 and a resin abutment 24. A flange 25 is formed on the top of the main body 21, and a recess 22 is formed on the bottom. A ring 27 is disposed on the bottom surface of the valve chamber 13, and a coil spring 26 is disposed between the top surface of the ring 27 and the bottom surface of the flange 25. The abutment 24 is fitted into the recess 22 and fixed by crimping. The materials for the main body 21 and the abutment 24 are appropriately selected depending on the properties, pressure, and temperature of the fluid. SUS316 is used for the main body 21, but is not limited to this. PCTFE, PVDF, polyimide, etc. are used for the abutment 24, but are not limited to these.

[0022] Figure 1(B) is an enlarged cross-sectional view of the vicinity of the lower end of the valve disc 20 in the fully closed state. In the fully closed state, the valve disc serves as the closed end of the inlet passage. The abutment portion is only visible at the periphery of the closed end of the inlet passage, so the area in contact with the fluid flowing in from the inlet passage 11 is smaller than that of the valve in Figure 7, in which the abutment portion is visible over the entire closed end of the inlet passage. Furthermore, because the abutment portion 24 is not located in the center of the closed end of the inlet passage, where the temperature of the fluid becomes highest due to adiabatic compression, the effect of the heat generated by adiabatic compression on the abutment portion 24 can be reduced.

[0023] Fig. 1(C) is an enlarged view of the main body 21 of Fig. 1(A). In Fig. 1(C), a recess 22 is formed, but instead of this recess 22, a step 23 may be formed as shown in Fig. 1(D).

[0024] 2 to 5 show valves of other embodiments, and descriptions of some of the same parts as in valve 1 shown in Fig. 1 will be omitted. Valve element 30 of valve 2 shown in Fig. 2 has a main body 31, with a flange 35 formed on the top of main body 31 and a recess 32 formed on the bottom, a ring 37 disposed on the bottom surface of valve chamber 13, and a coil spring 36 disposed between the top surface of ring 37 and the bottom surface of flange 35. A contact portion 34 is fitted into recess 32 and fixed by crimping.

[0025] 2(B) is an enlarged cross-sectional view of the vicinity of the lower end of the valve body 30. The end face of the main body and the inlet passage opening have the same shape and phase, so that the contact portion 34 does not come into contact with the fluid flowing in from the inlet passage 11. This structure can further reduce the effect on the contact portion 34 of the heat generated by adiabatic compression.

[0026] The valve 3 shown in Fig. 3 is a valve of embodiment 3. The valve element 40 of the valve 3 shown in Fig. 3(A) has a main body 41, which has a flange 45 formed on the top and a recess 42 formed on the bottom, a ring 47 disposed on the bottom surface of the valve chamber 13, and a coil spring 46 disposed between the top surface of the ring 47 and the bottom surface of the flange 45. An abutment portion 44 is fitted into the recess 42 and fixed by crimping.

[0027] 3(B) is an enlarged cross-sectional view of the vicinity of the lower end of the valve body 40. The end face of the main body 41 on the valve seat 14 side, surrounded by the recess 42, is larger than the opening 15, and the abutment part 44 is farther from the center of the bottom surface of the main body 42 than in the valve shown in FIG. 2, so that the valve is less susceptible to the influence of gas heated by adiabatic compression.

[0028] The valve shown in Figure 4 is a valve of embodiment 4. The valve of embodiment 4 differs from the valve of embodiment 2 in the shape of the valve seat side end of the valve body, and the inner wall of recess 52 is formed to be inclined inward. By press-fitting abutment portion 54 into recess 52 of this shape, the problem of fluid leakage from the gap between the valve body and abutment portion in embodiment 2 is solved.

[0029] The valve 5 shown in Figure 6 is a valve of embodiment 5. The valve body 60 of the valve 5 shown in Figure 6(A) has a main body 61, which has a flange 65 formed on the top and a recess 62 formed on the bottom, a ring 67 disposed on the bottom surface of the valve chamber 13, and a coil spring 66 disposed between the top surface of the ring 67 and the bottom surface of the flange 65. An abutment portion 64 is fitted into the recess 62 and fixed by crimping.

[0030] 6(B) is an enlarged cross-sectional view of the vicinity of the lower end of the main body 61. The valve 5 has a recess 68 formed at the lower end of the main body 61. By forming this recess 68, the bottom of the recess 68 becomes the location where the temperature rises the most due to adiabatic compression, and the temperature of the gas in contact with the contact portion 64 during adiabatic compression can be further reduced. [Industrial Applicability]

[0031] As described above, the present valve can provide a valve that controls high-pressure fluid and whose valve body is not damaged even when adiabatic compression occurs. [Explanation of symbols]

[0032] 1, 2, 3, 4 valves 10 Valve body 11 Entrance Passage 12 Exit passage 13 Valve chamber 14 Valve seat 15 Opening 16 diaphragm 17 Handle 20, 30, 40, 50, 60 valve body 21, 31, 41, 51, 61 Main body 22, 32, 42, 52, 62 recesses 23 Step section 24, 34, 44, 54, 64 Contact part 25, 35, 45, 55, 65 flange 26, 36, 46, 56, 66 coil springs 27, 37, 47, 57, 67 rings 68 Recess

Claims

1. a valve body including an inlet passage, an outlet passage, and a valve chamber communicating the inlet passage and the outlet passage; a valve body that abuts against and moves away from a valve seat formed at an opening of the inlet passage that opens into the valve chamber, The valve body comprises a metal columnar main body portion, and a resin annular abutment portion that is disposed in a step or recess formed on the outer periphery of the valve seat side end of the main body portion and abuts against the valve seat.

2. 2. The valve according to claim 1, wherein the valve seat side end face of the main body and the opening of the inlet passage have the same shape and phase, and when the valve is closed, the valve body and the main body prevent the abutment portion from coming into contact with the inflow gas.

3. 2. The valve according to claim 1, wherein a valve seat side end face of the main body portion surrounded by the step portion or the recess is larger than an opening of the inlet passage, and when the valve is closed, the valve body and the main body portion prevent the abutment portion from coming into contact with the inflow gas.

4. The valve according to any one of claims 1 to 3, characterized in that the inner wall of the step or the recess is formed to be inclined inward, and the abutment portion is press-fitted into the step or the recess.

5. The valve according to any one of claims 1 to 3, wherein a recess is formed in the valve seat side end of the main body.

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