Parker Series R5U Pilot Operated Pressure Unloading Valve, SAE Flange

Pilot operated pressure unloading  valves series R5U are exceptional – both in function and design – even under high flow conditions. They are part of the Parker valve range with SAE flanges which is unique in its variety. Series R5U has a similar design to the subplate mounted R4U series.

R5U valves are used to unload a circuit at low pressure. The SAE flange allows to mount the valve directly on the outlet flanges of pumps. A typical application is  the unloading of pumps in an accumulator circuit. The combination of an R5U, C5V and R5V on a double pump generates a high pressure/low pressure system without the need of a manifold block or piping between the valves. The R5U is optionally available with a vent function for unpressurized circulation.

Markets:

• Industrial

Benefits:

• Maximum adjustable pressure of 350 bars and flow capacity ranging from 90 l/min to 600 l/min – high performance
• Sophisticated pilot stage design – reduces pressure overshoot and cracking flow to a minimum, thus reducing heating, power and production losses in high pressure operation
• Design combines a poppet type seat valve with the pilot control – precise adjustment and quick response to eliminate pressure variation and system shocks
• Short delivery time – no warehousing necessary
• 3-port body with SAE61 flange – enables compact design
• 4 sizes (SAE ¾”, 1″, 1¼”, 1½”)
• 3 pressure stages
• 3 adjustment modes
– Hand knob
– Acorn nut with lead seal
– Cylinder lock
• With optional vent function

Applications:

• Suitable for general hydraulic applications

Technical Specifications

Parker Series R5U Pilot Operated Pressure Unloading Valve, SAE Flange Service Manual

    Parker Series R5U Pilot Operated Pressure Unloading Valve, SAE Flange Service Manual