Seismic Shutoff Earthquake Valves are earthquake sensitive gas shut-off valves. They are intended to close in the event of an earthquake to prevent gas flow into a structure where earthquake damage may have occurred. The valve reduces the potential for fire or explosion due to the release of natural gas into the structure where gas lines, gas fixtures, or gas appliances are existing.
These valves do not use any source of internal or external electrical power. They are designed to remain closed until manually reset. The valves are intended to be mounted in the gas line, upstream or downstream of the gas-line pressure regulator and gas meter outside the structure.