The GasLOK™ is an excess flow valve – bypass (EFVB) type of excess flow valve. The excess flow valve – bypass (EFVB) allows a small amount of gas to bypass the valve after it has closed. The valve is designed with a spring and plunger. The spring holds the plunger in the open position, allowing normal gas flow associated with gas appliance usage.
In the unlikely event of a rupture occurring in the service line, causing abrupt, excessive leak and pressure drop, the change will cause the spring to collapse, and the plunger will significantly reduce the flow of gas. Once the gas line pressure is equalized across the valve, the spring in the valve automatically resets and returns the plunger to the open position.
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