Accurate Pressure Control;
Optional Check Feature;
Fast Open to prevent damage;
Slow Close to avoid harmful water hammer;
Automatic Operation.
The Model 47-03 Pressure Relief Valve is a hydraulically operated, pilot-controlled, modulating valve designed to maintain constant upstream pressure. This valve can be used for pressure relief, pressure sustaining, back pressure, or unloading functions in a by-pass system.
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. The valve closes to prevent return flow when a pressure reversal occurs if the optional check feature is added.