Types 381001 – 381171 excess flow check valves
The excess flow check valve is an inline mounting valve which prevents the loss of control fluid in the event of a line break or high leakage downstream. Typically installed in service lines to actuators vulnerable to damage, and located within a system control panel close to the main directional control valve.
The shutoff flow rate is internally adjustable, so a given valve will cover a range of shutoff flow conditions. The valve is designed to pass fluid normally until the flow rate reaches the predetermined setting – at which point a ball check valve seals off the flow.
In many system applications it will be necessary to bypass the excess flow check during startup operations. For this reason the valve can be supplied with either a tapping for external bypass or with an integral valve for internal bypass. The check valve can also be supplied with automatic reset, where an internal orifice allows a continuous bypass bleed.
The check valve is manufactured from 316 stainless steel and CA104 aluminium bronze materials and complies with the requirements of NACE Standard MR-01-75 (latest revision as applicable).
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