R4U Series Pressure Unloading Valves
Series R4U subplate mounted unloading valves are used to unload a circuit at low pressure. Typical applications are to unload the pumps in an accumulator circuit and to unload the low pressure stage of a double pump. Series R4U features a pilot operated unloading valve, three pressure ranges, two switching types, and three adjustment nodes. *In addition, Series R4U with vent function is vented by electrical operation. Please ask for more details.
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Specifications
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Mechanical
Interface Subplate mounting acc. ISO 5781 - Mounting Position As desired. Horizontal mounting preferred. - Operating Pressure Ports A and X: Up to 350 bar (5,075 psi) Ports B and Y: Depressurized Pressure Range 105, 210, 350 bar 1,523, 3,045, 5,075 psi Pressure Differential 15% for pressure range 350 bar (2,538 psi) 28% for pressure ranges 105 bar (1,523 psi) and 250 bar (3,625 psi) Nominal Flow NG10: 150 LPM (39.7 GPM) - NG25: 350 LPM (92.6 GPM) - NG32: 650 LPM (172.0 GPM) - Pressure Fluid Hydraulic oil according to DIN 51524 … 51525 - Viscosity Recommended: 30 to 50 cSt / mm²/s (139 to 232 SSU) Maximum: 20 to 380 cSt / mm²/s (93 to 1,761 SSU Pressure Fluid Temperature Recommended: +30°C to +50°C (+86°F to +122°F) Maximum: -20°C to +70°C (-4°F to +158°F) Filtration ISO 4406 (1999); 18/16/13 - Environmental
Ambient Temperature -20°C to +80°C (-4°F to +176°F) - -
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