Safety device for gas supply pipe
OwnerMasafusa Yamadainventor
Life of this patent
Estimating the term…
Abstract
A gas supply pipe is provided with a terminal shutoff valve upstream of a heater, stove or the like. An automatic shutoff valve is provided to the gas pipe upstream of the terminal shutoff valve which automatically closes upon receipt of an electrical signal from an earthquake sensor, fire detector, gas leak detector or other sensor indicating a dangerous condition. A gas pressure sensor provided between the automatic shutoff valve and the terminal shutoff valve prevents the automatic shutoff valve from being manually reset unless the terminal shutoff valve is closed, thereby preventing an explosion which might result if gas were fed to the heater or stove with the pilot light extinguished.
Claims7
A safety device for a gas pipe having a terminal shutoff valve comprising:
- an automatic shutoff valve provided to the gas pipe upstream of the terminal shutoff valve including an actuator member and biasing means urging the actuator member toward a valve closing position;
- first latch means for latching the actuator member in a valve opening position and being actuatable by an electrical shutoff signal to release the actuator member allowing the actuator member to be moved to the valve closing position by the biasing means;
- second latch means for latching the actuator member in the valve closing position;
- and
- sensor means for generating and feeding an electrical reset signal to the second latch means to actuate the second latch means to release the actuator member for manual movement to the valve opening position against the force of the biasing means when the terminal shutoff valve is closed.
Dependencies are inferred from the claim text.