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Hydraulics

R5U Series Unloading Valves

The pilot operated pressure unloading valves series R5U are particularly suitable for unloading a circuit at low pressure. The SAE flanges allow to mount the valve directly on the outlet flanges of pumps to achieve a very compact design.

  • Specifications
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    Mechanical

    Mounting Flanged according to SAE 61 -
    Mounting Position Unrestricted -
    Maximum Operating Pressure: Ports A, B, X Size 06: 350 bar (5,075 psi) -
    Size 08: 350 bar (5, 075 psi) -
    Size 10: 280 bar (4,060 psi) -
    Size 12: 210 bar (3,045 psi) -
    Maximum Operating Pressure: Ports Y, Y1 30 bar (435 psi) -
    Pressure Ranges 105 bar (1,523 psi), 210 bar (3,045 psi), 350 bar (5,075 psi) -
    Nominal Flow Size 06: 90 LPM (23.8 GPM) -
    Size 08: 300 LPM (79.4 GPM) -
    Size 10: 600 LPM (158.7 GPM) -
    Size 12: 600 LPM (158.7 GPM) -
    Fluid Temperature -20°C to +80°C (-4°F to +176°F) -
    Viscosity Permitted - 10 to 650 cSt / - mm²/s (46 to 3,013 SSU) Recommended - 30 cSt / mm²/s (139 SSU)
    Filtration ISO Class 4406 (1999); 18/16/13 (acc. NAS 1638:7) -

    Environmental

    Ambient Temperature -20°C to +50°C (-4°F to +122°F) -

    Electrical

    Duty Ratio 100% -
    Solenoid Connection Connector as per EN175301-803 -
    Protection Class IP65 in accordance with EN60529 (plugged and mounted) -
    Supply Voltage Code G0R: 12V -
    Code G0Q: 24V -
    Code GAR: 98V -
    Code GAG: 205V -
    Code W30: 100V at 50Hz Code W30: 120 V at 60Hz
    Code W31: 220V at 50Hz Code W31: 240V at 60Hz
    Tolerance Supply Voltage Code G0R: +5 to -10 -
    Code G0Q: +5 to -10 -
    Code GAR: +5 to -10 -
    Code GAG: +5 to -10 -
    Code W30: ±5 -
    Code W31: ±5 -
    Power Consumption: Hold Code G0R: 31W -
    Code G0Q: 31W -
    Code GAR: 31 W -
    Code GAG: 31 W -
    Code W30: 78W -
    Code W31: 78W -
    Power Consumption: In Rush Code G0R: 31W -
    Code G0Q: 31W -
    Code GAR: 31 W -
    Code GAG: 31 W -
    Code W30: 264W -
    Code W31: 264W -
    Response Time Energized / De-energized AC 20/18 ms, DC 46/27 ms -
    Maximum Switching Frequency AC up to 7,200 switchings/hour DC up to 16,000 switchings/hour
    Coil Insulation Class H (180°C) (356°F) -
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