Cylinder valve having a device for reducing or closing off the flow in the event of a rise in temperature

摘要

A cylinder valve for pressurized gas with a body including a gas inlet, a gas outlet and a passage connecting the inlet to the outlet. The valve also includes a closing/opening valve, a pressure reducer and a device for reducing or closing the gas passage between said valve and a pressure reducer. The device includes an element that is made of shape-memory alloy and positioned in a cavity of the passage. The element includes an active deformable portion, the circular outer edge of which is capable of engaging with the inner surface of the cavity in order to close the passage following a rise in temperature caused by combustion. The combustion can be generated by adiabatic compression during the opening of the valve.

主权项

1. A pressurized gas container tap, comprising a housing
with a gas inlet, a gas outlet and a passage connecting the inlet to the outlet; a shut-off and opening valve in the gas passage; and a device for at least one of reducing and closing the passage in response to an increase in temperature, the device being located in the housing downstream of the shut-off and opening valve, the device for at least one of reducing and closing the passage comprising:
a shape memory alloy element structured and operable to deform when a temperature of the device exceeds a preset level, the shape memory alloy element comprising:a deformable portion with a circular peripheral outer edge structured and operable to make a direct contact with a fixed cylindrical surface surrounding the deformable portion so as to at least one of reduce and close the passage.