| 摘要 |
A gas safety valve is provided which has a valve chamber within a housing, a nd a gas inlet and outlet respectively communicating with an inlet and outlet e nd of the valve chamber. A valve is disposed in the valve chamber for allowing gas to flow from the inlet to the outlet when the valve is in an open position, and preventing gas flow wh en the valve is in a closed position at either end of the valve chamber. The valve may include a piston having a tortuous gas transmitting opening therein, the resistance to gas flow caused by the tortuous opening rendering the valve responsive to slight variations in gas pressure differential between the inlet and the outlet. A resilient spring is provided which extends betwe en the outlet and the valve. The spring urges the valve into the open position, and allows it to reversibly move to a closed position against the outlet when the pressure differential betwe en the inlet and outlet of the valve chamber becomes sufficiently high to overcome the resistance of the spring.
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