How Seismic Shut-Off Valves Work
Seismic valves automatically shut off the gas to your building when an earthquake occurs.
Seismic Automatic Gas Shutoff 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: