JPH07167321A - Safety valve that also serves as a seal - Google Patents

Abstract

(57) [Summary] [Purpose] The primary pressure safety valve is not provided as a separate component inside the product, but is also used as a component on the primary pressure side of the product. [Structure] The seal and safety valve (1) is made of a material that retains its shape at room temperature and exhibits fluidity when the temperature rises. The seal / safety valve (1) is designed to open the seal by utilizing the fact that the pressure rises as the environmental temperature rises. The material is a soft synthetic resin, especially low density polyethylene is preferred.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety valve that also serves as a seal for high pressure gas.

[0002]

2. Description of the Related Art Conventionally, as a means for safely releasing a high pressure to the outside, a rupturable plate or a fusible plug has been used in addition to a safety valve that opens the valve with an elastic material such as a spring. The rupture disc is attached to the main body, and when the pressure exceeds a set value, the rupture disc is destroyed to instantaneously release the pressure to the outside. The fusible plug is made of an alloy such as Pb and Zn, and when it reaches a certain temperature, it melts itself and flows out to the outside to release the pressure.

[0003]

Since these rupturable plates and fusible plugs are independently installed in products such as pressure reducing valves as safety means for primary pressure (for high pressure), the product structure is complicated. Therefore, the cost is high.

An object of the present invention is not to provide the safety valve for primary pressure as a separate component in the product, but also to use it as a component on the primary pressure side of the product.

[0005]

The safety valve that also serves as a seal according to the present invention is made of a material that retains its shape at room temperature and exhibits fluidity when one or both of temperature and pressure increase.
The material is a soft synthetic resin. The soft synthetic resin is low density polyethylene.

[0006]

[Function] This safety valve that also serves as a seal is formed in the shape of a sealing material, packing, etc., and is installed at a place where it is necessary to prevent leakage by deforming and sealing by the pressure of the high pressure gas of the product such as a pressure reducing valve. It At room temperature, it functions as a sealant as usual and blocks gas leakage.

When the product is placed near a fire or is heated due to a fire or the like, the safety valve that also serves as a seal becomes fluid and flows into the seal gap on the side opposite to the side receiving high pressure to lose the sealing function. . Then, since it flows out of the product together with the high-pressure gas, the product and the high-pressure gas cylinder attached to the product do not burst.

In a normal case, since the high pressure gas is discharged to the outside by the outflow of a part of the seal / safety valve, the entire seal / safety valve does not flow out.

When the material is a soft synthetic resin, it is easy to mold and has a good sealing property.

When the soft synthetic resin is low-density polyethylene, the fluidity at high heat is improved and it can be manufactured at low cost.

[0011]

1 and 2 are a cross-sectional view and a plan view of a safety valve 1 that also serves as a seal, showing an example in which the safety valve 1 that also serves as a seal is formed in the shape of a sealing material. Safety valve for this seal 1
Is composed of a material having shape retention property at room temperature, that is, a property of retaining the shape given to itself, and exhibiting fluidity when one or both of temperature and pressure increase.

As such a material, a soft synthetic resin is preferable, and low density polyethylene is more preferable. FIG. 3 shows an example in which the safety valve 1 that also serves as a seal is used as an ordinary pressure reducing valve which is a product.

11 is a pressure reducing valve, 12 is a box, 13 is a primary valve pin, 14 is an O-ring for a seat, 15 is a seat retainer, 1
6 is a press nut, 17 is a press nut O-ring, 18 is a puncture needle, 19 is a puncture O-ring, 20 is packing, 21 is a packing presser, 22 is a cylinder, 23 is an atmosphere opening port, and 24 is a ring of the seat presser 15. It is a recess.

The seal / safety valve 1 is fitted in the annular recess 24 of the seat retainer 15 and seals between the casing 12 and the seat retainer 15 at room temperature. When the pressure reducing valve 11 is heated to a high temperature for some reason, the seal / safety valve 1 becomes fluid. Further, the seal / safety valve 1 also receives a high pressure due to a rise in the external temperature, and therefore flows out into the gap between the casing 12 and the sheet retainer 15 and out through the atmosphere opening port 23 to the outside. Therefore, the sealed state is opened and the high-pressure gas is released to the outside to prevent the pressure reducing valve 11 and the cylinder 22 from being damaged or ruptured.

[0015]

According to the present invention, the safety valve that also serves as a seal is made of a material that retains its shape at room temperature and exhibits fluidity when one or both of temperature and pressure increase. It can function as a sealing material at normal temperature, and can function as a safety valve that flows out of the sealing position and releases high-pressure gas to the outside at an abnormally high temperature.

According to the second and third aspects, the molding is easy, the sealing property is good, and the fluidity at the time of high heat is further enhanced.
And it can be manufactured at low cost.

[Brief description of drawings]

FIG. 1 is a cut side view showing a specific example of a safety valve that also serves as a seal according to the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a view showing a state in which the seal / safety valve according to the present invention is used as a pressure reducing valve, and is a side view showing a state in which a part of the pressure reducing valve is omitted and the pressure reducing valve and the seal / safety valve are cut off.

[Explanation of symbols]

 1 Seal and safety valve

Claims (3)

[Claims] 1. A seal characterized in that the seal is opened by utilizing the fact that the pressure rises with the rise of the environmental temperature, which is made of a material which retains its shape at room temperature and exhibits fluidity when the temperature rises. Dual safety valve (1). 2. The safety valve with seal (1) according to claim 1, wherein the material is a soft synthetic resin. 3. The safety valve with seal function (1) according to claim 2, wherein the soft synthetic resin is low density polyethylene.