Unloading Valve, Subplate Mounting - Series R4U

*PRODUCT IMAGE IS REPRESENTATIVE PROVIDED BY THE MANUFACTURER. DO NOT MAKE BUYING DECISIONS SOLEY BASED ON THE IMAGE. PLEASE VERIFY SPECIFICATIONS MEET YOUR REQUIREMENTS.

Parker subplate mounted unloading valves series R4U are exceptional – both in function and design – even under high flow conditions. Pacemaking in design, these valves offer improved features.

The pilot operated R4U valves are used to unload a circuit at low pressure. The mechanically adjustable pressure signal to unload the main stage has to be applied to port X. The pressure differential between opening and closing is nominal 15 or 28 % of the setting pressure:
• 28 % for pressure stages 105 and 210 bar
• 15 % for pressure stage 350 bar

Typical applications are unloading of pumps in an accumulator circuit or unloading of the low pressure stage of a double pump. The R4U is available with an electrical vent valve for unpressurized circulation.

Markets:
• Industrial

Features/Benefits:
• High performance - maximum adjustable pressure of 350 bars and a flow capacity ranging from 150 l/min to 650 l/min
• Pilot stage design reduces pressure overshoot and cracking flow to a minimum - thus reducing heating, power and production losses in high pressure operation
• Precise adjustment and quick response - eliminate pressure variation and system shocks
• Short delivery time - no warehousing necessary
• 3 pressure stages - for sensitive control
• 2 vent valve functions
• 3 adjustment modes:
    - hand knob
    - acorn nut with lead seal
    - cylinder lock

Applications:
• Suitable for general hydraulic applications

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SKU	Availability	Price	Maximum Flow Rate	Division	Maximum Operating Temperature	Minimum Operating Temperature	Seal Material	Operation Type	Product Series	For Fluid Type	Body Material	Frequency	Maximum Pressure Setting	Flow Rate	Weight	Mounting Type	Actuation Type	Maximum Operating Pressure	Seal Material	Port Connection	Drain Option	Pressure Control Range	Maximum Operating Pressure	Pressure Adjustment Control Type	Switching Option	Input Voltage
R4U10-5313009G0RA1	Backordered	POR	n/a	Industrial Systems Division Europe	60 °C	-20 °C	NBR	Pilot	Pressure Valve	Hydraulic Oil According to DIN 51524	Cast Iron	n/a	105 bar	650 L/min	7.7 kg	Subplate mounting	Manually	Port A, X 350; port B, Y depressurized	NBR	NG32 / CETOP 10	Drain line internal	105 bar	Port A, X 350 BAR; port B, Y depressurized	Acorn nut with lead seal	Vent function: solenoid not active, unpressurized circulation	12 VDC
R4U10-53140A1	Backordered	POR	n/a	Industrial Systems Division Europe	60 °C	-20 °C	NBR	Pilot	Pressure Valve	Hydraulic Oil According to DIN 51524	Cast Iron	n/a	105 bar	650 L/min	6 kg	Subplate mounting	Manually	Port A, X 350; port B, Y depressurized	NBR	NG32 / CETOP 10	Drain line internal	105 bar	Port A, X 350 BAR; port B, Y depressurized	Cylinder lock	N/A	N/A
R4U10-5331009W30A1	Backordered	POR	n/a	Industrial Systems Division Europe	60 °C	-20 °C	NBR	Pilot	Pressure Valve	Hydraulic Oil According to DIN 51524	Cast Iron	50/60 Hz	210 bar	650 L/min	7.7 kg	Subplate mounting	Manually	Port A, X 350; port B, Y depressurized	NBR	NG32 / CETOP 10	Drain line internal	210 bar	Port A, X 350 BAR; port B, Y depressurized	Hand knob	Vent function: solenoid not active, unpressurized circulation	110/120 VAC
R4U10-5331009W31A1	Backordered	POR	n/a	Industrial Systems Division Europe	60 °C	-20 °C	NBR	Pilot	Pressure Valve	Hydraulic Oil According to DIN 51524	Cast Iron	50/60 Hz	210 bar	650 L/min	7.7 kg	Subplate mounting	Manually	Port A, X 350; port B, Y depressurized	NBR	NG32 / CETOP 10	Drain line internal	210 bar	Port A, X 350 BAR; port B, Y depressurized	Hand knob	Vent function: solenoid not active, unpressurized circulation	230/240 VAC
R4U10-5331011G0QA1	Backordered	POR	n/a	Industrial Systems Division Europe	60 °C	-20 °C	NBR	Pilot	Pressure Valve	Hydraulic Oil According to DIN 51524	Cast Iron	n/a	210 bar	650 L/min	7.7 kg	Subplate mounting	Manually	Port A, X 350; port B, Y depressurized	NBR	NG32 / CETOP 10	Drain line internal	210 bar	Port A, X 350 BAR; port B, Y depressurized	Hand knob	Vent function: solenoid activated, unpressurized circulation	24 VDC
R4U10-5331011W31A1	Backordered	POR	n/a	Industrial Systems Division Europe	60 °C	-20 °C	NBR	Pilot	Pressure Valve	Hydraulic Oil According to DIN 51524	Cast Iron	50/60 Hz	210 bar	650 L/min	7.7 kg	Subplate mounting	Manually	Port A, X 350; port B, Y depressurized	NBR	NG32 / CETOP 10	Drain line internal	210 bar	Port A, X 350 BAR; port B, Y depressurized	Hand knob	Vent function: solenoid activated, unpressurized circulation	230/240 VAC
R4U10-5331109G0QA1	Backordered	POR	n/a	Industrial Systems Division Europe	60 °C	-20 °C	NBR	Pilot	Pressure Valve	Hydraulic Oil According to DIN 51524	Cast Iron	n/a	210 bar	650 L/min	7.7 kg	Subplate mounting	Manually	Port A, X 350; port B, Y depressurized	NBR	NG32 / CETOP 10	Drain line external from subplate	210 bar	Port A, X 350 BAR; port B, Y depressurized	Hand knob	Vent function: solenoid not active, unpressurized circulation	24 VDC
R4U10-53311A5	Backordered	POR	n/a	Industrial Systems Division Europe	60 °C	-20 °C	FPM	Pilot	Pressure Valve	Water Glycol	Cast Iron	n/a	210 bar	650 L/min	6 kg	Subplate mounting	Manually	Port A, X 350; port B, Y depressurized	FPM	NG32 / CETOP 10	Drain line external from subplate	210 bar	Port A, X 350 BAR; port B, Y depressurized	Hand knob	N/A	N/A
R4U10-5351009W30A1	Backordered	POR	n/a	Industrial Systems Division Europe	60 °C	-20 °C	NBR	Pilot	Pressure Valve	Hydraulic Oil According to DIN 51524	Cast Iron	50/60 Hz	350 bar	650 L/min	7.7 kg	Subplate mounting	Manually	Port A, X 350; port B, Y depressurized	NBR	NG32 / CETOP 10	Drain line internal	350 bar	Port A, X 350 BAR; port B, Y depressurized	Hand knob	Vent function: solenoid not active, unpressurized circulation	110/120 VAC
R4U10-5351011G0QA1	Backordered	POR	n/a	Industrial Systems Division Europe	60 °C	-20 °C	NBR	Pilot	Pressure Valve	Hydraulic Oil According to DIN 51524	Cast Iron	n/a	350 bar	650 L/min	7.7 kg	Subplate mounting	Manually	Port A, X 350; port B, Y depressurized	NBR	NG32 / CETOP 10	Drain line internal	350 bar	Port A, X 350 BAR; port B, Y depressurized	Hand knob	Vent function: solenoid activated, unpressurized circulation	24 VDC
R4U10-5351109G0QA1	Backordered	POR	n/a	Industrial Systems Division Europe	60 °C	-20 °C	NBR	Pilot	Pressure Valve	Hydraulic Oil According to DIN 51524	Cast Iron	n/a	350 bar	650 L/min	7.7 kg	Subplate mounting	Manually	Port A, X 350; port B, Y depressurized	NBR	NG32 / CETOP 10	Drain line external from subplate	350 bar	Port A, X 350 BAR; port B, Y depressurized	Hand knob	Vent function: solenoid not active, unpressurized circulation	24 VDC
R4U10-5351109W30A1	Backordered	POR	n/a	Industrial Systems Division Europe	60 °C	-20 °C	NBR	Pilot	Pressure Valve	Hydraulic Oil According to DIN 51524	Cast Iron	50/60 Hz	350 bar	650 L/min	7.7 kg	Subplate mounting	Manually	Port A, X 350; port B, Y depressurized	NBR	NG32 / CETOP 10	Drain line external from subplate	350 bar	Port A, X 350 BAR; port B, Y depressurized	Hand knob	Vent function: solenoid not active, unpressurized circulation	110/120 VAC
R4U10-53511A1	Backordered	POR	n/a	Industrial Systems Division Europe	60 °C	-20 °C	NBR	Pilot	Pressure Valve	Hydraulic Oil According to DIN 51524	Cast Iron	n/a	350 bar	650 L/min	6 kg	Subplate mounting	Manually	Port A, X 350; port B, Y depressurized	NBR	NG32 / CETOP 10	Drain line external from subplate	350 bar	Port A, X 350 BAR; port B, Y depressurized	Hand knob	N/A	N/A

Unloading Valve, Subplate Mounting - Series R4U

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