What is the difference between an Excess Flow Automatic Gas Safety Valve and a Seismic (earthquake) Valve?
Excess Flow Automatic Gas Safety Valves are not motion sensitive valves or earthquake valves. They work on gas flow rates and pressure. They are not triggered by ground movement, but by the additional flow of gas caused by a break in the gas line or a disconnected gas line. Seismic Valves (earthquake valves) triggered by ground movement and have a manual reset after being triggered and all pilots lights in need to be reset causing most homeowners to call a professional to reset and relight pilot on water heaters, furnaces, stoves, etc. Excess Flow Valves automatically resets when the broken line has been repaired.
