valve

Abstract

The purpose of the present invention is to provide a valve that hardly causes leakage between a seat member and a valve body when a high-temperature, high-pressure fluid flows.　Provided is a valve comprising: a valve body 10 including a valve chamber 13 communicating with a fluid inlet path 11 and an outlet path 12; a cylindrical seat member 30 including an inlet-side communication path 32 communicating with the inlet path, an outlet-side communication path 33 communicating with the outlet path, and a valve seat 31 formed on a peripheral edge of an opening of the outlet-side communication path, the seat member being disposed in the valve chamber; and a valve disc 4 capable of coming into contact with and separating from the valve seat. A male taper 35 is formed in a valve seat-side end portion of the seat member. The male taper presses a female taper 16 formed in the valve chamber, thereby forming a seal.

Description

[Technical Field]

[0001] The present invention relates to a fluid control valve, and more particularly to a valve that is suitably used as an on-off valve for controlling high-pressure fluid. [Background technology]

[0002] The valve for high-pressure fluid disclosed in Patent Document 1, shown in Figure 5(1), includes a valve body 101 having a valve chamber 104 that connects a fluid inlet 102 and a fluid outlet 103. A seat member 106 is disposed within the valve chamber 104 and has a valve seat 107 formed therein that controls the fluid by coming into contact with and separating from a valve element 114. The seat member 106 is pressed upward from below by a pressing member 109 that is screwed into the valve body 101. Fluid leakage from the upper end of the seat member 106 is prevented.

[0003] Fig. 5(2) is a partially enlarged view of Fig. 5(1). The description of some of the parts described in Fig. 5(1) will be omitted. The fluid flows from the fluid inlet 102 through the inlet passage 102a, passes through the inlet-side communication passage 106a and the outlet-side communication passage 106b formed in the sheet member 106, and flows out of the fluid outlet 103 through the outlet passage 103a. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. WO2019 / 026814 Summary of the Invention [Problem to be solved by the invention]

[0005] However, if the pressure of the fluid flowing inside the valve is further increased, or if the fluid temperature is high and high pressure, the screws may loosen, reducing the surface pressure between the seat member and the valve body and causing fluid leakage from the seat member contact surface.

[0006] The present invention has been made in view of the above points, and its object is to provide a valve that is less likely to cause leakage between the seat member and the valve body when high-temperature, high-pressure fluid is flowing through it. [Means for solving the problem]

[0007] The present invention (1), which has been made to solve the above problems, is a valve comprising a valve body having a valve chamber communicating an inlet passage and an outlet passage for a fluid, an inlet-side communicating passage communicating with the inlet passage, an outlet-side communicating passage communicating with the outlet passage, and a valve seat formed on the periphery of the opening of the outlet-side communicating passage, a cylindrical seat member disposed in the valve chamber, and a valve disc that can be brought into and out of contact with the valve seat, wherein a male taper is formed on the valve-seat side end of the seat member, and the male taper presses against a female taper formed in the valve chamber to form a seal.

[0008] In the present invention (1), the outer periphery of the seat member is formed with a male taper tapered toward the valve seat, and a female taper that tapers to this male taper is formed in the valve chest, and the seat member and the valve body are fitted together by a taper fit. Therefore, even if a force that reduces the fitting force acts on the seat member, a friction force acts on the tapered slope, and the force that reduces the fitting force decreases with the sine of the taper angle, so the sealing performance between the seat member and the valve body is unlikely to deteriorate. Details will be explained in the explanation section of Figure 4.

[0009] The present invention (2) is the valve of the present invention (1), characterized in that the pressing force is generated by threading a female thread formed on the inner peripheral surface of the valve chamber and a male thread formed on the outer peripheral surface of the seat member.

[0010] In the present invention (2), the pressing force is generated by a simple structure in which a female thread engraved on the inner peripheral surface of the valve chamber and a male thread engraved on the outer peripheral surface of the seat member are threaded together, thereby reducing costs.

[0011] The present invention (3) is the valve of the present invention (1), characterized in that the pressing force is generated by a seat member presser disposed below the seat member.

[0012] In the present invention (3), even when the seat member and the valve body are not screwed together as in the present invention (2), the sealing performance can be maintained by applying a pressing force to the seat member using a seat member holder.

[0013] The present invention (4) is the valve of the present invention (3), characterized in that a seat retainer male screw is formed on the outer periphery of the seat retainer, and the seat retainer male screw and the female screw are threaded together to generate the pressing force.

[0014] In the present invention (4), the pressing force is generated by a simple structure in which the male screw of the seat retainer formed on the outer periphery of the seat retainer is screwed into the female screw formed in the valve body, thereby reducing costs. [Effects of the Invention]

[0015] According to the present invention, it is possible to provide a valve in which leakage is unlikely to occur between the seat member and the valve body when a high-temperature, high-pressure fluid is flowing. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a partial cross-sectional view showing the entire valve according to an embodiment of the present invention. [Figure 2] FIG. 2 is a partial cross-sectional view showing a part of the valve shown in FIG. [Figure 3] FIG. [Figure 4] 10A and 10B are schematic diagrams illustrating the state of force application, etc., comparing a conventional sheet member with the sheet member of the present invention. [Figure 5] FIG. 1 is a partial cross-sectional view showing the entire conventional valve. DETAILED DESCRIPTION OF THE INVENTION

[0017] 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.

[0018] Fig. 1 shows a partial cross-sectional overall view of a valve according to an embodiment of the present invention. Valve 1 controls the flow of fluid by contact and separation between a valve element 4 attached to the tip of a stem 3 connected to an actuator 2 and a seat member 30 formed with a valve seat 31. Seat member 30 is disposed inside a valve body 10, which has an inlet passage 11 and an outlet passage 12. Seat member 30 is required to maintain airtightness, be wear-resistant, have thermal conductivity, and be strong, and may be made of ordinary carbon or metal. Below the seat member 30, a tapered eccentric screw 40 and a cover member 21 and a plug 20 for sealing with a gasket 22 are arranged, and the actuator 2 and the valve body 10 are joined with a fixing screw 5.

[0019] Figure 2 is an enlarged view of the main parts of the valve in Figure 1. Some parts common to Figure 1 will not be described. A valve chamber 13 is formed inside the valve body 10, and a cylindrical seat member 30 is disposed inside the valve chamber 13. The valve chamber 13 has a large diameter portion 13a and a small diameter portion 13b. The large diameter portion 13a communicates with the inlet passage 11 through an opening formed on its inner circumferential surface, and communicates with the outlet passage 12 through an opening formed on its ceiling surface. The small diameter portion 13b has a female thread 14 formed on its inner circumferential surface, and opens to the bottom surface of the valve body 10. The seat member 30 is inserted from the bottom surface of the valve body 10, and the male thread 34 formed on the lower outer periphery of the seat member 30 is threadedly engaged with the female thread 14 and fixed, and the male taper 35 formed on the upper end surface of the seat member is pressed against the female taper 16 formed on the ceiling surface of the large diameter portion 13a, forming a seal. A tapered eccentric screw 40 that is threadedly engaged with the female thread portion 14 is disposed below the seat member 30, and the tapered eccentric screw 40 prevents loosening. An annular gasket 22, a cover member 21, and a plug 20 are disposed below the tapered eccentric screw 40, and a seal is formed between the gasket 22 and the valve body 10, preventing fluid from leaking from the bottom surface of the valve body 10 to the outside. The seat member 30 has an inlet-side communicating passage 32 that opens on the outer peripheral surface of the seat member 30 and communicates with the inlet passage 11, and an outlet-side communicating passage 33 that opens at the upper end of the seat member 30 and communicates with the outlet passage 12. A valve seat 31 is formed around the periphery of the opening of the outlet-side communicating passage 33. In the embodiment shown in Figure 2, the inlet-side communicating passage 32 has an oval shape that is long in the axial direction, and is formed in a total of four places: two that open on the left and right sides, and two that open on the front and back sides, as indicated by dotted lines, resulting in a structure that can process even large flow rates of fluid.

[0020] An annular space 15 is formed between the inlet passage 11 and the inlet-side communicating passage 32. The fluid flows in through the inlet passage 11, then circulates through this annular space 15, passes through the four inlet-side communicating passages 32, passes through the outlet-side communicating passage 33, and flows out from the outlet passage 12.

[0021] FIG. 3 is a perspective view of the sheet member 30 used in the embodiment of FIGS. A male thread 34 is formed on the outer peripheral surface of the lower portion, and this male thread 34 is threadedly engaged with the female thread 14 of the valve body. An inlet-side communicating passage 32 is formed in the center, and fluid passes through this inlet-side communicating passage 32, flows through the outlet-side communicating passage 33, and flows out from the outlet passage 12. A valve seat 31 is formed on the upper end surface. A male taper 35 is formed on the outer periphery of the upper part of the seat member 30, and a male taper abutment surface 36 abuts against the female taper abutment surface 17 (see Figure 2) to form a seal.

[0022] Figure 4(1) is a partial cross-sectional view of the valve chest of a conventional valve, and Figure 4(2) is a partial cross-sectional view of the valve chest of the present invention. Figure 4(3) is an enlarged view of the area enclosed by the dotted line in Figure 4(1), and Figure 4(4) is an enlarged view of the area enclosed by the dotted line in Figure 4(2).

[0023] In the conventional valve shown in Figure 4(3), the load acting on the upper sealing part of the seat member is F f Then, due to the loosening of the threads and the influence of temperature changes, the load F f is δF f If the seal surface pressure decreases by 100%, this decrease will result in a 100% decrease in the seal surface pressure.

[0024] On the other hand, in FIG. 4(4) of the valve of the present invention, the load applied to the upper sealing portion of the seat member 30 is F t Then, the load F t is δF t If the coefficient of static friction between the valve body 10 and the seat member 30 is μF, then the reduction in the size of the valve body 10 will be only sinθ (where θ is the taper half angle). t Since the sin θ force acts upward along the tapered surface, the force required to maintain the seal between the seat member 30 and the valve body 10 is smaller than in the conventional structure. [Industrial Applicability]

[0025] As described above, the valve of the present invention can be suitably used as a valve that is less likely to cause leakage between the seat member and the valve body when high-temperature, high-pressure fluid is passed through it. [Explanation of symbols]

[0026] 1 valve 2 Actuators 3 Stem 4 Valve body 5 Fixing screws 10 Valve body 11 Entrance Passage 12 Exit passage 13 Valve chamber 14 Female thread 15 Annular Space 16 female taper 17 Female tapered contact surface 20 Plug body 21 Cover member 22 Gasket 30 Sheet material 31 Valve seat 32 Entrance side connecting passage 33 Outlet side communication path 34 Male thread 35 Male taper 36 Male tapered contact surface 40 Tapered eccentric screw

Claims

1. a valve body having a valve chamber communicating with an inlet passage and an outlet passage for a fluid; a cylindrical seat member disposed in the valve chamber, the cylindrical seat member including an inlet-side communication passage communicating with the inlet passage, an outlet-side communication passage communicating with the outlet passage, and a valve seat formed on a periphery of an opening of the outlet-side communication passage; a valve having a valve body that can be brought into contact with and separated from the valve seat, A male taper is formed on the valve seat side end of the seat member, and the male taper presses against a female taper formed in the valve chamber to form a seal.

2. 2. The valve according to claim 1, wherein a female thread portion formed on an inner peripheral surface of the valve chamber and a male thread portion formed on an outer peripheral surface of the seat member are threadably engaged with each other.

3. 2. The valve according to claim 1, wherein a seat member presser is disposed on an end of the seat member opposite to the valve seat, and the seat member presser presses the seat member.

4. 4. The valve according to claim 3, wherein the seat retainer is threadably engaged with a female thread portion formed on the inner peripheral surface of the valve chamber.

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