Excess Flow valves are known by other names such as velocity check, emergency shutdown device, seismic valve, shutdown valve, surge preventer, earthquake valve, and line rupture valve. These valves are designed to close when a sudden flow surge occurs. Excess Flow valves are in-line valves through which pressurized gas or liquid flows in either direction. These are spring-loaded flow shut-off valves, which will only close when the flow through the valve exceeds a predetermined closing flow rate in the direction marked on the valve. Each valve has a closing flow rate based on specified conditions. Our 2000 series Excess Flow valves can be used for several types of fluids and processes including LP gas, butane, anhydrous ammonia, anhydrous chlorine, nitrogen air, water, and others. Excess Flow valves are available in a wide variety of pressure classes, materials, flange designs and end connections. All valves are tested in our certified flow laboratory. Test certificates and performance graphs are provided by our state-of-the-art data-acquisition system, Total Valve Live.
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The 2120 Series Excess Flow Valves are designed and manufactured with standard ASME/ANSI flanged ends to be used in liquid, gas, and vapor service.
The 2130 Series Excess Flow Valves are designed for use in liquid, gas or vapor service to stop the flow in the event of a sudden flow change.
The 2140 Series Excess Flow Valves have female NPT connections on the inlet side and male NPT connections on the outlet side.
The 2150 Series Excess Flow Valves have female NPT connections on the inlet side and female NPT connections on the outlet side.
The 2160 Series Excess Flow Valves have male NPT connections on the inlet side and male NPT connections on the outlet side.