How Seismic Shut-Off Valves Work
Seismic valves automatically shut off the gas to your building when an earthquake occurs.
Seismic Automatic Gas Shut-off valves are a simple, but effective way to ensure you never experience the terror of a gas fire after an earthquake. They operate on movement and shut-off the supply of gas to a building, when triggered by a 5.4 magnitude or larger earthquake. The operation of a Horizontal Seismic Valve can be seen in the illustration below: