Gas actuated valve system
AssigneesAndrene Associates, Martin R. Asbra
InventorsMartin R. Asbra, Andrew F. Asbra, Nicholas J. Bovis
Life of this patent
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Abstract
A gas actuated valve system includes a gas switch disposed in a primary gas circuit upstream of a gas driven actuator. The switch is movable to an open position when a pilot gas is supplied under pressure to the gas switch through a pilot circuit, and is movable to a closed position when the pilot pressure is released. A seismic valve coupled to the pilot circuit senses seismic activity and releases pilot gas pressure, thus moving the gas switch to the closed position, when seismic activity is detected.
Claims7
A gas actuated valve system for shutting off fluid flow in a fluid conduit, comprising:
- a fluid shut off valve for placement in the fluid conduit;
- a gas driven actuator, connected to the fluid shut off valve for moving the fluid shut off valve between open and closed positions;
- a primary gas circuit, in fluid communication with the gas driven actuator, for supplying gas from a gas source to the gas driven actuator at a pressure sufficient to maintain the fluid shut off valve in the open position;
- a gas switch disposed in the primary gas circuit upstream of the gas driven actuator and being movable to an open position when a pilot gas is supplied under pressure to the gas switch through a pilot circuit, and to a closed position when the pilot pressure is released;
- and
- seismic means externally coupled to the pilot circuit for sensing seismic activity and releasing pilot gas pressure, thus moving the gas switch to the closed position, when seismic activity is detected.
Dependencies are inferred from the claim text.