20140238493 | SEISMICALLY ACTIVATED GAS SHUT-OFF VALVE - A gas shut-off valve assembly designed to automatically close gas flow in a gas conduit in response to a seismic vibration comprises a trigger mechanism disposed in a trigger mechanism housing, a springless sealing mechanism disposed in a valve housing, a latching mechanism configured to engage the springless sealing mechanism to keep the gas conduit open, and a pressure release valve. Upon sensing a seismic vibration, the trigger mechanism disengages the springless sealing mechanism from the latching mechanism. Simultaneously, the springless sealing mechanism swings down and rotates around an axis by gravitational force to close off gas flow in the conduit. To reopen gas flow, the pressure release valve is actuated to relieve accumulated gas pressure inside the valve housing and the springless sealing mechanism is manually reset to its original open position. | 08-28-2014 |