Flanged Excess Flow Valve

A mechanical safety device that may be installed on a natural gas service line, and is designed to automatically shut off the flow of natural gas in the service line in the event of a significant break, puncture, or severance in the line.

An excess flow valve operates similar to electrical circuit breakers that trip when the electricity current exceeds its limit. The excess flow valve is tripped by an excess flow of gas, causing a spring loaded device inside the valve to automatically restrict the flow of gas. The valve automatically resets or reopens when the excess flow of gas has ceased or service line gas pressure is significantly reduced.