JP6944178B2 - valve - Google Patents

Description

The present invention is a valve, and since the valve rod has a hole communicating with the inside of the accommodating portion and the hole communicates with the downstream flow path, the fluid can be released to the downstream flow path and accommodating. The present invention relates to a valve characterized in that fluid does not collect between a portion and a valve body.

A valve is a device provided 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, and control a fluid.
When the valve is raised and the flow path is opened, the fluid flows from upstream to downstream, and when the valve is lowered and the flow path is closed, the fluid flow is stopped.
In addition, some valves can adjust the flow rate by moving the valve up and down a little and narrowing the flow path.
In many cases, multiple valves are provided in the flow path, and when the valve on the downstream side is closed and the valve provided on the upstream side is open, pressure is applied to the piping on the upstream side and the valve chamber of the valve. ..
This is because the higher the pressure of the fluid, the higher the pressure applied to the upstream side.
In this state, when the pressure in the valve chamber rises, a small amount of fluid flows between the valve rod accommodating portion and the valve body.
If such a state continues, the fluid gradually accumulates between the accommodating portion of the valve stem and the valve body.
When a valve is used to flow fluid, the valve body is constantly under pressure due to the pressing force of the actuator when it is closed and the pressure of the fluid when it is open, so there is little possibility that the valve body will loosen or come off. ..
However, especially when the pressure around the valve body becomes lower than the pressure when the valve is used, such as when purging gas is flowed during maintenance or when the pressure inside the flow path becomes atmospheric pressure, the pressure of the fluid accumulated in the accommodating part and the valve body becomes the flow path. Since the pressure becomes high with respect to the pressure of, the accumulated fluid may apply pressure to the valve body, causing the valve body to loosen or come off, which may reduce valve performance and pose a risk when handling toxic fluids. It was a problem.

In the valve device described in Patent Document 1, the seal member is separated from the closing valve seat by opening and operating the opening / closing handle, and the inlet path and the outlet path communicate with each other through the closing valve chamber to allow the stored gas to escape to the atmosphere. ..
The high-pressure solenoid valve described in Patent Document 2 is provided with a breathing hole in the valve rubber so that gas can escape to the atmosphere in accordance with a sudden drop in ambient pressure.

Japanese Unexamined Patent Publication No. 2007-292252 Japanese Unexamined Patent Publication No. 10-141516

However, the valve device described in Patent Document 1 needs to be opened in order to remove the accumulated gas, and the high-pressure solenoid valve described in Patent Document 2 has a problem that the gas cannot be discharged when the ambient pressure does not decrease. was there.
In addition, the accumulated gas escaped to the atmosphere, so it could not be used as a valve for handling toxic fluids.

The present invention has been made to solve the above-mentioned problems, and the valve rod is provided with a hole to discharge the fluid accumulated between the valve body and the accommodating portion into the flow path without performing a special operation. It provides a valve that can handle toxic fluids because it does not emit to the atmosphere.

The invention according to claim 1 is a valve provided with an upstream side flow path, a downstream side flow path, a valve chamber and a valve stem, and the valve chamber communicates with the upstream side flow path and the downstream side flow path, respectively. , The valve rod can move up and down in the valve chamber, one end of the valve rod is provided with an accommodating portion for accommodating the valve body, and a hole communicating with the inside of the accommodating portion is formed in the valve rod, and the hole is formed. The present invention relates to a valve characterized in that the accommodating portion is communicated with a valve chamber and / or a downstream flow path via the accommodation portion.

The invention according to claim 2 relates to the valve according to claim 1, wherein the accommodating portion is provided with one or more grooves communicating with the hole.

The invention according to claim 3 relates to the valve according to claim 1 or 2, wherein the accommodating portion is provided with a recess.

According to the invention of claim 1, when the pressure around the valve body is lower than the pressure when the valve is used, the pressure of the fluid accumulated between the accommodating portion and the valve body becomes higher than the pressure of the flow path. However, it is possible to prevent the fluid from being discharged from the inside of the accommodating portion to the downstream flow path by the hole provided in the valve rod, and the valve body from loosening or falling off.
Further, by discharging the fluid flowing between the accommodating portion and the valve body to the downstream flow path, the fluid is not discharged to the atmosphere and the toxic fluid can be handled.

According to the second aspect of the present invention, by providing the groove, the fluid accumulated between the accommodating portion and the valve body moves along the groove to the hole, so that the fluid can be more easily discharged to the flow path.

According to the third aspect of the present invention, the provision of the recesses creates a gap between the valve body and the accommodating portion, so that the valve body can withstand more pressure.

It is a partial cross-sectional view of the valve which concerns on this invention. It is an enlarged view of the part (α) shown by the circle of FIG. 1, and is the figure which shows one Embodiment of this invention. FIG. 2 is a cross-sectional view taken along the line AA of FIG. It is an enlarged view of the part (α) shown by the circle of FIG. 1, and is the figure which shows the other embodiment of this invention. FIG. 4 is a cross-sectional view taken along the line BB of FIG. It is an enlarged view of the part (α) shown by the circle of FIG. 1, and is the figure which shows the other embodiment of this invention. FIG. 6 is a cross-sectional view taken along the line CC of FIG. It is a schematic explanatory drawing which enlarged a part of a valve stem.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a partial cross-sectional view according to the present invention.
As shown in FIGS. 1 and 2, the valve body V of the valve 1 according to the present invention has a valve chamber capable of communicating with the upstream flow path F1, the downstream side flow path F2, the upstream side flow path F1 and the downstream side flow path F2, respectively. 2 (see FIG. 2) and a valve stem 3.
Here, referring to FIG. 2, the valve chamber 2 refers to a space in which the valve body 4 accommodated in the accommodating portion 5 which is a part of the valve rod 3 can move up and down and forms a flow path. And.
The valve stem 3 is provided with an accommodating portion 5 at one end on the upstream side flow path F1 side.
The accommodating portion 5 may be integrally configured with the valve rod 3, or may be configured as a separate body.
The valve body 4 is accommodated in the accommodating portion 5, and is arranged so as to face the valve seat 6 provided in the opening on the upstream side flow path F1 side of the valve chamber 2 (see FIG. 2).
In the present specification, the side where the accommodating portion 5 accommodates the valve body 4 is referred to as the inside of the accommodating portion, and the side in contact with the valve chamber 2 or the downstream flow path F2 is referred to as the outside of the accommodating portion.
When the valve body 4 accommodated in the accommodating portion 5 is seated on the valve seat 6, the flow path can be closed, and when the valve body 4 is separated from the accommodating portion 5, the flow path can be opened.
The valve seat 6 may be integrally configured with the valve body V , or may be configured as a separate body.
The valve seat 6 is provided with an opening 10, and the opening 10 communicates the upstream flow path F1 with the valve chamber 2.
The shape of the valve seat 6 is not particularly limited.

The valve 1 according to the present invention can be applied to any of high pressure, medium pressure and low pressure fluids.
"High pressure" is the pressure due to the fluid and is 1 megapascal or more, and "medium pressure" is the pressure due to the fluid and is 0.1 megapascal or more and less than 1 megapascal, and "low pressure". "" Is the pressure due to the fluid, and refers to the pressure of less than 0.1 megapascal, respectively.
In recent years, with the development of fuel cell technology and the like, it is also required to flow a fluid having a very high pressure of 50 megapascals or more. The valve 1 of the present invention is particularly effective for such a very high pressure fluid.
The present invention can be used for a toxic fluid because the fluid accumulated in the accommodating portion 5 is discharged to the valve chamber 2 or the downstream flow path F2 but is not discharged to the atmosphere.

As shown in FIG. 2, an accommodating portion 5 is provided at one end of the valve rod 3 on the valve seat 6 side, and the valve body 4 is accommodated in the accommodating portion 5. For example, the valve body 4 is accommodated by adopting a caulking structure. Fix to 5.
The accommodating portion 5 may be configured integrally with the valve rod 3, or may be configured as a separate member and attached to one end of the valve rod 3.
As the valve stem 3, a commonly used one such as stainless steel is used.
The valve body 4 is made of resin, and polyetheretherketone (PEEK) or the like is used because of its properties such as heat resistance, fatigue resistance, chemical resistance, hydrolysis resistance, and insulating property.

The holes 7, the grooves 8, and the recesses 9 will be described with reference to the drawings.
2, FIG. 4, and FIG. 6 are enlarged views of one end of the valve rod 3 of FIG. 1, which is a partial cross-sectional view, in order to show an example of the valve body 4, the accommodating portion 5, the hole 7, the groove 8, and the recess 9. be.
The valve seat 6 is provided at a position facing the valve body 4.
FIG. 8 is a view of one end of the valve stem 3 as viewed from the outside.
As shown in FIG. 8, the valve rod 3 is provided with at least one hole 7 communicating with the inside of the accommodating portion, and the hole 7 may be provided in the valve rod 3 or may be provided outside the accommodating portion.
The hole 7 preferably communicates with the downstream flow path F2.
Since the hole 7 communicates with the downstream flow path F2, the fluid accumulated between the accommodating portion 5 and the valve body 4 is discharged to the downstream side flow path F2 and is not discharged to the atmosphere.
In addition, the hole 7 may communicate with the valve chamber 2.
By communicating with the valve chamber 2, the fluid accumulated between the accommodating portion 5 and the valve body 4 is not discharged to the outside but is discharged into the valve chamber 2, so that when the flow path is opened, the fluid is discharged to the downstream side together with other fluids. It can flow into the flow path F2.
In the present specification, the case where a plurality of holes 7 are communicated and connected to each other through the groove 8, that is, the case where the valve rod 3 penetrates from one end to the other end is defined as a through type, and only one hole 7 is provided. Even if a plurality of holes 7 are provided, for example, if the groove 8 is not provided, or if the hole 7 or the groove 8 does not communicate with the recess 9, the holes 7 do not communicate with each other. That is, when the hole 7 does not penetrate from one end to the other end of the valve stem 3, it is a non-penetrating type.

Since the groove 8 and the hole 7 communicate with each other, the gas accumulated between the accommodating portion 5 and the valve body 4 can be easily discharged.
The shape and depth of the groove 8 are not particularly limited.
In FIG. 3, both the groove 8 and the recess 9 are provided, but either one may or may not be provided.
The recess 9 may be circular or polygonal.
By providing the recess 9, a gap is formed between the accommodating portion 5 and the valve body 4, and the valve body 4 can withstand more pressure.

Examples of the present invention will be described in detail with reference to the drawings, but the examples are not particularly limited.
A case where the valve stem 3 has only one hole 7 will be described.
It is conceivable that the valve stem 3 has only the hole 7 (see FIGS. 4 and 5), and that the valve rod 3 has one or both of the groove 8 and the recess 9 in addition to the hole 7, both of which are non-penetrating. Become a mold.
At this time, the recess 9 may or may not communicate with the hole 7 and the groove 8.
A case where the valve stem 3 has a plurality of holes 7 will be described.
When only the holes 7 are provided, the holes 7 do not communicate with each other, so that the holes 7 are non-penetrating type.
When the holes 7 and the grooves 8 are provided, the holes 7 communicate with each other through the grooves 8 to form a through type (see FIGS. 6 and 7).
When the hole 7, the groove 8 and the recess 9 are provided, if the hole 7 communicates with the groove 8 and the groove 8 and the recess 9 communicate with each other, the groove 8 becomes a through type (see FIGS. 2 and 3). When the recess 9 and the recess 9 do not communicate with each other, it becomes a non-penetrating type.
When the holes 7 and the recesses 9 are provided, if the holes 7 communicate with each other through the recesses 9, it is a penetrating type, and if at least one of the holes 7 does not communicate with the recesses 9, it is a non-penetrating type. Become.

The valve 1 of the present invention is provided with a hole 7 in which the valve rod 3 communicates with the inside of the accommodating portion and the valve chamber 2 and / or the downstream flow path F2 even in the closed state, so that the accommodating portion 5 and the valve body 4 are provided from the hole 7. Since the fluid accumulated between and is discharged to the downstream flow path F2, there is no risk of toxic fluid being discharged to the atmosphere even if purge gas is flowed during maintenance such as replacement of the valve body 4. Workers can safely perform maintenance work.

Since the valve of the present invention can be used for various fluids and the fluid does not collect between the valve body and the accommodating portion, the pressure around the valve body is such that a purge gas is flowed during maintenance or the pressure in the flow path becomes atmospheric pressure. It is possible to prevent the phenomenon that the accumulated fluid applies pressure to the valve body and the valve body loosens or comes off when the pressure drops below the pressure when the valve is used.
Furthermore, since the fluid is discharged to the downstream flow path, the toxic fluid is discharged to the atmosphere, and the risk of the maintenance worker inhaling or bathing in the toxic fluid is reduced.

1 Valve 2 Valve chamber 3 Valve rod 4 Valve body 5 Accommodation part 6 Valve seat 7 Hole 8 Groove 9 Recess 10 Opening F1 Upstream side flow path F2 Downstream side flow path
V valve body

Claims (1)

A valve for a high-pressure gas of 1 MPa or more equipped with an upstream flow path, a downstream side flow path, a valve chamber, and a valve stem.
The valve chamber communicates with the upstream side flow path and the downstream side flow path, respectively, and the valve stem can move up and down in the valve chamber.
One end of the valve stem is provided with a recess and an accommodating portion having at least one groove communicating with the valve chamber through a hole, and the valve stem is formed with a plurality of the holes. The inside of the accommodating portion and the valve chamber and / or the downstream flow path are communicated with each other through the plurality of holes, and the holes are communicated with each other through the groove, and between the accommodating portion and the valve body. A valve characterized in that the accumulated fluid is discharged to the downstream flow path.

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