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Parker Series UR*E / US*E Unloading Valve
The unloading valves series UR*E and US*E consist of a mechanical pilot stage and a slip-in cartridge main stage. In addition the series US*E is vented by electrical operation. These valves are used to unload a circuit at low pressure.
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The unloading valves series UR*E and US*E are used to unload a circuit at low pressure and provide a very precise switching and hysteresis for smooth operation. A wide range of sizes and pressure stages makes them almost universally applicable.
Both valves consist of a mechanical pilot stage and a slip-in cartridge main stage. The mechanically adjustable pressure signal to unload the main stage has to be applied to port X. The nominal pressure differential between opening and closing is 15 %. Series US*E is additionally vented by electrical operation. The UR*E/US*E model codes embrace the pilot valves, covers and cartridges that are also offered as separate items.
Markets:
• Industrial
Benefits:
• Cavity and mounting pattern according to ISO 7368 – for quick, easy integration
• Precise switching and hysteresis – for smooth and reliable operation
• High nominal flow rates up to 4000 l/min – optimum efficiency in relation to valve size
• 4 pressure stages – enables fine adjustment
• 6 sizes, NG16 to NG63 – makes selection easy
• Short delivery time – no warehousing necessary
• 2 switching types (series US*E)
• 3 adjustment modes:
– hand knob
– acorn nut with lead seal
– cylinder lock
• Remote control via port X- Pilot operated unloading valve
Applications:
• Suitable for general hydraulic applications
• General presses
• Injection molding
Technical Specifications
| Mounting Type | Slip-in cartridge |
| Actuation Type | Manually, Solenoid |
| Product Series | Pressure valve |
| Weight | Depending on size, 2.2 – 22.8 kg |
| Maximum Flow Rate | N/A |
| Maximum Operating Pressure | 350 bar |
| Maximum Operating Temperature | 60 °C |
| Minimum Operating Temperature | -20 °C |
| Seal Material | NBR, FPM |
| Configuration | N/A |
| Flow Rate | Depending on size, 220 – 4000 L/min |
| For Fluid Type | Hydraulic oil according to DIN 51524, Water glycol |
| Function | Normally Closed |
| Operation Type | Pilot |
| Maximum Pressure Setting | 70, 175, 250, 350 bar |
| Body Material | Steel / cast iron (cover) |
Parker Series UR*E / US*E Unloading Valve Service Manual
Parker Series UR*E / US*E Unloading Valve Service Manual
