JP2023079418A - valve - Google Patents

Abstract

To provide a valve where the leakage of fluid is hardly caused even when low-temperature and high-pressure fluid flows therein.SOLUTION: A valve includes a valve body 10 including a valve chest 17 connecting an inlet passage 11 and an outlet passage 12 for fluid, a seat member 30 including an inlet side communication path 32 communicating with the inlet passage, an outlet side communication path 33 communicating with the outlet passage, and a valve seat 31 formed at the end on the outlet side of the outlet side communication path 12, and arranged in the valve chest 17, a seat pressor 40 having a recess 45 formed from the end on the opposite side of the valve seat 31 side to the valve seat side, and engaging with the valve body for urging the seat member to the valve seat side to fix the seat member 30 to the valve chest 13, and a protruded member 50 mounted into the recess for expanding the recess.SELECTED DRAWING: Figure 2

Description

TECHNICAL FIELD The present invention relates to a fluid control valve, and more particularly to a valve suitable for use as an on-off valve for controlling high-pressure fluid.

A valve is a device that is installed in a flow path such as a pipe and has a movable mechanism (valve) that can open and close the flow path in order to pass, stop, or control the flow of fluid. When the valve is raised and the channel is opened, the fluid flows from upstream to downstream, and when the valve is lowered and the channel is closed, the fluid flow is stopped. In addition, there is also a valve that can adjust the flow rate by slightly moving the valve up and down to narrow the flow path.

Depending on the pressure of the fluid, there is a risk that the fluid will leak when it passes through the channel, so measures have been taken to prevent leakage. In particular, valves used for low-temperature, high-pressure fluids such as hydrogen stations are required to flow extremely high-pressure fluids of 50 megapascals or more. Since contraction, deformation, etc. of the O-ring occur, a metal seal structure like the valve described in Patent Document 1 has been used.

A valve 100 for high-pressure fluid shown in FIG. 6 has a valve element 104 attached to the tip of a stem 103 connected to an actuator 102 and a seat member 130 having a valve seat 131 formed thereon. control the flow. The seat member 130 is arranged inside the valve body 110 in which the inlet passage 111 and the outlet passage 112 are formed. The sheet member 130 is fixed by being pressed upward by a sheet presser 140 located below. An annular gasket 122 , a lid member 121 and a plug 120 are arranged below the sheet presser 140 . The valve body 110 and the actuator 102 are connected by a fixing screw 105.

FIG. 7 is a partially enlarged view of valve 100 of FIG. A valve chamber 117 is formed in the valve body 110, and a seat member 130 in which an inlet-side communication passage 132 and an outlet-side communication passage 133 are formed is pressed upward by a seat presser 140 from below and fixed in the valve chamber 117. It is The seat pressing male thread 143 and the valve body female thread 114 are engaged by screwing. A plug 120 is engaged with the valve body lower recess 116 by screwing a valve body lower female thread 115 and a plug body male thread 123 . A hexagonal hole 141 is formed in the lower portion of the seat retainer 140. A hexagonal wrench or the like is fitted in the hexagonal hole 141 for the seat retainer, and the seat retainer 140 is screwed into the valve body 110, and the upper surface of the seat retainer is closed. 144 presses the seat member abutting lower surface 135, and the seat member abutting upper surface 134 is strongly abutted against the valve body abutting surface 118, preventing fluid leakage (back leakage) from the portion enclosed by the dotted line. ing.

Published practical application No. 1-89616

However, even if the valve 100 does not cause back leakage immediately after being assembled, the screw engagement between the seat pressing male screw 143 of the seat pressing member 140 and the valve body female thread 114 may be disturbed by opening and closing while the low temperature and high pressure fluid repeatedly flows. There is a possibility of loosening and back leakage from the portion surrounded by the dotted line in FIG. 7 .

SUMMARY OF THE INVENTION The present invention has been made in view of such a point, and an object thereof is to provide a valve in which fluid leakage is less likely to occur even when it is opened and closed while a low-temperature, high-pressure fluid is flowing.

The present invention (1) comprises a valve body including a valve chamber that connects an inlet passage and an outlet passage for a fluid, an inlet side communication passage that communicates with the inlet passage, an outlet side communication passage that communicates with the outlet passage, and the outlet. A seat member having a valve seat formed at the end of the side communication passage on the outlet side, the seat member disposed in the valve chamber, and a recess extending from the end opposite to the valve seat toward the valve seat. a seat retainer that engages with the valve body and urges the seat member toward the valve seat to fix the seat member in the valve chamber; and an opening convex member.

In the present invention (1), a recess is formed from the end opposite to the valve seat side toward the valve seat side, engages with the valve body, and biases the seat member toward the valve seat side. The seat retainer for fixing the seat member to the valve chamber and the convex member attached to the concave portion for expanding the concave portion are provided. The engagement between the seat member and the seat retainer is stronger, and back leakage between the seat member and the valve body is less likely to occur.

In the present invention (2), the seat retainer has a seat retainer male thread engraved on the outer peripheral surface thereof, and is screwed with a valve body female thread engraved on the valve body so that the seat retainer is engaged with the valve body. The valve according to the present invention (1) is characterized by:

In the present invention (2), since the seat retainer and the valve body are screwed together, the seat retainer and the valve body can be easily engaged.

The present invention (3) is the present invention (1) or (2), wherein the recess is a tapered hole having a tapered shape with a reduced diameter on the valve seat side, and the convex member is a tapered plug to be attached to the tapered hole. ) valve.

In the present invention (3), the recess is a tapered hole having a tapered shape with a reduced diameter on the valve seat side, and the convex member is a tapered plug that fits into the tapered hole. By mounting to the valve body, the recess is widened, the engagement between the valve body and the seat retainer is strengthened, and back leakage between the seat member and the valve body is less likely to occur.

In the present invention (4), a taper hole female thread of a female thread is engraved on the tapered inner surface of the tapered hole, and a taper plug male thread that is screwed with the tapered hole female thread is engraved on the outer peripheral surface of the taper plug. The valve of the present invention (3) is characterized by:

In the present invention (4), the tapered inner surface of the tapered hole is provided with a tapered hole female thread, and the outer peripheral surface of the taper plug is provided with a tapered plug male thread that engages with the tapered hole female thread. Therefore, the tapered plug can be easily and firmly attached to the tapered hole, and the seat retainer can be pressed toward the valve seat and the recess can be easily expanded.

In the present invention (5), a groove is formed in the seat retainer in parallel with the end face from the end face opposite to the valve seat toward the valve seat, and the bottom of the groove is positioned at the convex position. The valve according to any one of the present inventions (1) to (4), wherein the valve is located closer to the valve seat than the end surface of the shaped member opposite to the valve seat.

In the present invention (5), a groove is formed in the seat retainer in parallel with the end face from the end face opposite to the valve seat toward the valve seat, and the bottom of the groove is positioned at the convex position. Since the convex member is positioned closer to the valve seat than the opposite end face of the valve seat, when the convex member is fitted in the recess and the seat retainer is pressed toward the valve seat, the recess is closed. is expanded more easily, the engagement between the valve body and the seat retainer becomes stronger, and back leakage between the seat member and the valve body is less likely to occur.

According to the present invention, it is possible to provide a valve in which fluid leakage is less likely to occur even when a low-temperature, high-pressure fluid is flowed.

1 is a partial cross-sectional overall view of a valve according to Embodiment 1 of the present invention; FIG. FIG. 2 is an enlarged view of a main portion of the valve according to Embodiment 1 of the present invention; 3 is an enlarged view of a further essential part of the essential part of FIG. 2; FIG. FIG. 10 is an enlarged view of a main portion of a valve according to Embodiment 2 of the present invention; FIG. 11 is an enlarged view of a main portion of a valve according to Embodiment 3 of the present invention; 1 is a partial cross-sectional overall view of a conventional valve described in Patent Document 1; FIG. FIG. 7 is a partial enlarged view of the conventional valve of FIG. 6;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail based on the drawings. The following embodiments are essentially preferable examples, and are not intended to limit the scope of the present invention, its applications, or its uses.

<Embodiment 1>
FIG. 1 shows a partial cross-sectional general view of a valve according to Embodiment 1. FIG. In the valve 1, a valve body 4 attached to the tip of a stem 3 connected to an actuator 2 and a seat member 30 having a valve seat 31 are brought into contact and separated to control the flow of fluid. The seat member 30 is arranged inside the valve body 10 in which the inlet passage 11 and the outlet passage 12 are formed. The sheet member 30 is required to maintain airtightness, wear resistance, thermal conductivity, and strength, and may be made of general carbon or metal. The sheet member 30 is fixed by being pressed upward by a sheet presser 40 located below. An annular gasket 22 , a lid member 21 and a plug 20 are arranged below the sheet presser 40 . The valve body 10 and the actuator 2 are connected with a fixing screw 5 . A taper plug screw (convex member) 50, which is a feature of the present invention, is disposed inside the sheet presser 40. As shown in FIG.

2 is an enlarged view of a main portion of the valve of FIG. 1. FIG. Part of the description of the parts common to those in FIG. 1 is omitted. A valve chamber 17 is formed inside the valve body 10, and a seat member 30 is disposed therein. The sheet member 30 is formed with an inlet-side communicating passage 32 communicating with the inlet passage 11 and an outlet-side communicating passage 33 communicating with the outlet passage 12 . A seat retainer 40 is disposed below the seat member 30 , and the seat retainer male screw 43 is screwed into the valve body female screw 14 to lock the seat retainer 40 to the valve body 10 . By applying a hexagonal wrench to the seat retainer hex hole 41 (see FIG. 3) and firmly screwing the seat retainer male screw 43 into the valve body female thread 14, the seat retainer upper surface 44 strongly presses the seat member contact lower surface 35 upward. As a result, the seat member contact upper surface 34 is brought into close contact with the valve body contact surface 18, and back leakage between the seat member contact upper surface 34 and the valve body contact surface 18 can be prevented.
A plug body recess 24 is formed in the plug body 20, a lid member 21 is disposed, the plug body 20 is disposed in the valve body lower recess 16, and the plug body male thread 23 and the valve body lower female thread 15 are screwed. are in agreement.

The repeated flow of low-temperature and high-pressure fluid loosens the engagement between the seat pressing male screw 43 and the valve body female screw 14, and the tightness between the seat member contact upper surface 34 and the valve body contact surface 18 decreases, causing back leakage. It may occur. Therefore, the recess 45 is formed as a taper hole female thread 42, and a taper plug screw (convex member) 50 is provided to be screwed into the taper hole female thread 42, and the taper plug male thread 51 is strongly screwed into the taper hole female thread 42. , the recess 45 is widened, and the engagement between the seat pressing male screw 43 and the valve body female screw 14 is less likely to loosen, and back leakage is less likely to occur even if the low-temperature and high-pressure fluid flows repeatedly.
The contact stress generated between the seat pressing male screw 43 and the valve body female screw 14 is about 10 times greater in the valve according to the present invention than in the conventional valve. As a result, the loosening of the seat retainer 40 is effectively suppressed, and the stress at the portion where the seat member 30 and the valve body 10 are in annular contact (the contact surface between the seat member contact upper surface 34 and the valve body contact surface 18) is reduced. back leakage can be prevented.

3 is an enlarged view of a further essential part of the essential part of FIG. 2. FIG. FIG. 3(A) is a front partial sectional view, and FIG. 3(B) is a bottom view. When a hexagonal wrench or the like is fitted into the taper plug screw hexagonal hole 52 of the taper plug screw (convex member) 50 and screwed in, the taper plug screw (convex member) 50 has a tapered shape. The recess 45 of the presser 40 expands, the screwing between the seat presser male screw 43 and the valve body female screw 14 is less likely to loosen, and back leakage is less likely to occur even when the valve body is opened and closed while low-temperature and high-pressure fluid is repeatedly supplied.

<Embodiment 2>
FIG. 4 is an enlarged view of a main portion of a valve according to Embodiment 2 of the present invention. The main part is almost the same as that of Embodiment 1 shown in FIG. A groove 47 is dug from the end face 46 of the sheet retainer 400 to a bottom position 48L (indicated by a dotted line) in parallel with the end face 46 . The bottom 48 of the groove 47 appears in FIG. 4B. When the seat pressing male screw 430 is screwed into the valve body female thread 14, the seat pressing upper surface 440 strongly presses the seat member abutting lower surface 35 upward. A hexagonal wrench or the like is applied to the taper plug screw hexagonal hole 52, the taper plug male screw 51 is screwed into the taper hole female screw 420, and the taper plug screw (convex member) 50 is strongly screwed in. The portion 45 can be easily expanded, the screw engagement between the seat pressing male screw 430 and the valve body female screw 14 is less likely to loosen, and back leakage is less likely to occur even if the low temperature and high pressure fluid flows repeatedly. As shown in the drawing, one groove 47 is provided in the diametrical direction, but two grooves 47 may be provided in a cross shape, for example.

<Embodiment 3>
FIG. 5 is an enlarged view of a main portion of a valve according to Embodiment 3 of the present invention. It is almost the same as the main part of Embodiment 1 shown in FIG. Another difference is that the outer peripheral surface of the member 53 is also not provided with a male thread. The seat retainer 4000 is screwed into the valve body 10 using a hexagonal plug or the like in the seat retainer hexagonal hole 4100 . After that, by fitting a taper plug (convex member) 53 into the recess 45 and striking the bottom surface 54 of the taper plug, the recess 45 expands and the screw between the seat holding male screw 4300 and the valve body female screw 14 is engaged. In this case, loosening becomes more difficult, and even if low-temperature and high-pressure fluid flows repeatedly, back leakage is less likely to occur.

As described above, the valve of the present invention is less likely to cause fluid leakage even when a low-temperature, high-pressure fluid is supplied, and can be suitably used in a hydrogen station or the like.

Valve body 11; inlet passage 12; outlet passage 14; valve body female thread 15; valve body lower female thread 16; valve chamber 18; valve body contact surface 20; plug body 21; lid member 22; gasket 23; plug body male thread 24; Sheet member contacting upper surface 35; Seat member contacting lower surface 40, 400, 4000; Sheet presser 41; 410, 4100; Recess 46; End face 47; Groove 48; Bottom 48L; Bottom position 50;
51; taper plug male thread 52; taper plug screw hexagonal hole 53; taper plug (convex member)
54; taper plug bottom

Claims (5)

a valve body having a valve chamber that connects 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 at an outlet-side end of the outlet-side communicating passage are provided in the valve chamber. a sheet member to be
A recess is formed from an end opposite to the valve seat side toward the valve seat side, engages with the valve body, and urges the seat member toward the valve seat side to move the seat member to the valve seat side. a seat retainer fixed to the valve chamber;
a convex member attached to the recess to expand the recess. A seat retainer male thread is engraved on the outer peripheral surface of the seat retainer, and is screwed with a valve body female thread engraved on the valve body so that the seat retainer is engaged with the valve body. A valve according to claim 1. 3. The valve according to claim 1, wherein the recess is a tapered hole having a tapered shape with a reduced diameter on the valve seat side, and the convex member is a tapered plug to be attached to the tapered hole. A tapered hole female thread of a female thread is engraved on the tapered inner surface of the tapered hole, and a tapered plug male thread to be screwed with the tapered hole female thread is engraved on the outer peripheral surface of the taper plug. 3. The valve according to 3. A groove is formed in the seat retainer in parallel with the end face from the end face opposite to the valve seat toward the valve seat, and the bottom of the groove is aligned with the valve seat of the convex member. 5. The valve according to any one of claims 1 to 4, wherein the valve is located closer to the valve seat than the opposite end surface.

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