CLA-VAL Models 50GE-01 and NGE50-01 Pressure sustaining/Surge Relief valves are hydraulically operated, pilot-controlled, modulating valves designed to maintain constant upstream (inlet) pressure within close limits. This valve can be used for pressure relief, sustaining, back pressure, or unloading functions in a by-pass system. In operation, the valve is actuated by line pressure through a pilot control system, opening fast to maintain steady line pressure but closing gradually to prevent surges. Operation is completely automatic and pressure settings may be easily changed.