JPH0215095Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a gas valve used in a pressure vessel such as an accumulator, and more specifically, a gas valve for a pressure vessel that is equipped with a safety device that operates when the environmental temperature rises abnormally due to a cause such as a fire. It provides:

In a pressure vessel filled with pressure gas, such as an accumulator placed in a pressure fluid system,
When the environmental temperature rises due to a fire or other cause, there is a danger that the pressure of the filled gas will rise abnormally, causing damage to the container or damage to other attached equipment. It is necessary to provide safety measures for rapid discharge of the fill gas in response to an increase in temperature.

FIG. 1 shows an example of a gas valve for a pressure vessel equipped with this type of safety means disclosed in Japanese Utility Model Application Publication No. 55-6599. A gas valve case 2 attached to the pressure vessel 1 has a cavity 4 provided with a gas injection hole 5 leading to the outside and a communication hole 6 leading to the inside.
A valve seat 7 is formed on the side surrounding the gas injection hole 5, and a valve body 10 is inserted with a fusible plug 11 made of a fusible material such as fuse metal.
The fusible plug 11 is disposed toward the valve seat 7 and is biased by a spring member 13 to close the gas injection hole 5.

In the above-described gas valve for a pressure vessel, the valve seat 7 and the fusible plug 11, which come into pressure contact with each other to shut off the gas injection hole 5 and the cavity 4, are both made of metal materials. Since a sufficient sealing function cannot be expected and the permanent deformation of the material forming the fusible plug 11 is large, the fusible plug 11
Since the lifespan of the gas is short and the frequency of replacement increases, losses due to suspension of operation of mechanical equipment, disposal of sealed gas, etc. increase.

In view of the above-mentioned problems with the conventional gas valve for pressure vessels, the present invention arranges a packing made of an elastic material surrounding the gas injection hole on the gas injection hole side of the gas valve case internal cavity, and uses a spring member to A fusible plug made of a fusible material is inserted into the valve body that is biased toward the gasket so as to face the gasket, and the elastic contact between the fusible plug and the gasket causes gas to flow. In addition to completely blocking the injection hole, due to the elasticity of the packing,
It is intended to maintain normal sealing function over a long period of time.

The illustrated embodiment will be described below. In the embodiment shown in FIG. 2, the gas valve case 2 is composed of an inner case and an outer case that are screwed together, and is made of a rubber-like elastic material on the side of the gas injection hole 5 of the cavity 4, A gasket 15 having a substantially snake-eye shape is attached to surround the gas injection hole 5, and a circular recess is provided on the side of the valve body 10 disposed in the cavity 4 that faces the gasket 15. A fusible plug 11 made of a fusible material and having a circular sealing protrusion 16 is inserted into the recess;
The gas injection 5 and the cavity 4 are shut off by the elastic contact between the packing 15 and the sealing protrusion 16 brought about by the biasing of the spring member 13 against the valve body 10. A protrusion 17 is formed on the valve body 10 so as to surround the packing 15, and a ventilation groove 19 is formed along the axial direction of the protrusion 17 and the outer peripheral surface of the valve body 10.

When the pressure vessel gas valve described above is exposed to high temperatures, the fusible plug 11 melts and the gas injection hole 1 held by elastic contact with the packing 15
Since the blockage for 5 is released, the filled gas
The gas is discharged through the communication hole 16, the cavity 14, the ventilation groove 19, and the gas injection hole 5. When injecting pressurized gas into the container 1, the spring member 13 is pressed through the fusible stopper 11 and the valve body 10 by a gas injection jig (not shown) coupled to the gas valve case. Sealing protrusion 16 and packing 15 of hotpot 11
The contact is broken and a gap is formed through which the pressurized gas is guided.

As mentioned above, the gas valve for pressure vessels of the present invention is configured to close the gas injection hole through elastic contact between the packing made of an elastic material and the fusible stopper. Since the sealing function against the pressurized gas sealed in the gasket is sufficiently maintained and the permanent deformation of the packing is small, the above-mentioned sealing function is maintained normally over a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an example of a gas valve for a pressure vessel according to the prior art, and FIG. 2 is a sectional view of an embodiment of the present invention. 1...Pressure vessel, 2...Gas valve case, 4
... Vacancy, 5 ... Gas injection hole, 6 ... Communication hole, 7
... Valve seat, 10 ... Valve body, 11 ... Fusible plug, 13 ... Spring member, 15 ... Packing, 16
... Sealing projection, 17 ... Annular protrusion, 19 ... Ventilation groove.

Claims (1)

[Scope of utility model registration request] a gas valve case 2 having a cavity 4 with a gas injection hole 5 and a communication hole 6 communicating with the inside of the container;
A gasket 15 made of an elastic material and placed on the side of the gas injection hole 5 of the cavity 4; a gasket 15 made of a fusible material and in contact with the gas injection hole 5 A gas valve for a pressure vessel, comprising a fusible plug 11 that closes off a fusible plug 11 and a spring member 13 that is placed in the cavity 4 and urges the fusible plug 11 toward the gasket 15.