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	Weight	Body Material	Mounting Type	Seal Material	Actuation Type	For Fluid Type	Product Series	Maximum Flow Rate	Division	Maximum Operating Pressure	Maximum Operating Temperature	Minimum Operating Temperature	Flow Rate	Operation Type	Frequency	Maximum Pressure Setting	Input Voltage	Seal Material	Port Connection	Switching Option	Drain Option	Pressure Control Range	Pressure Adjustment Control Type	Maximum Operating Pressure
026-56299-H	Backordered	POR	4.4 kg	Cast Iron	Subplate	NBR	Manual	Hydraulic Oil According to DIN 51524	Pressure Valve	n/a	Industrial Systems Division Europe	Port B, Y depressurized	60 °C	-20 °C	150 L/min	Pilot	n/a	105 bar	24 VDC	NBR	NG10 / CETOP 05	Vent function: solenoid activated, unpressurized circulation	Drain line internal	105 bar	Hand knob	Port A, X 350 BAR; port B, Y depressurized
026-57687-H	Backordered	POR	6.2 kg	Cast Iron	Subplate	NBR	Manual	Hydraulic Oil According to DIN 51524	Pressure Valve	n/a	Industrial Systems Division Europe	350 bar Port A, X	60 °C	-20 °C	350 L/min	Pilot	n/a	210 bar	24 VDC	NBR	NG25 / CETOP 08	Vent function: solenoid not active, unpressurized circulation	Drain line internal	210 bar	Acorn nut with lead seal	Port A, X 350 BAR; port B, Y depressurized
026-95629-0	Backordered	POR	6 kg	Cast Iron	Subplate	NBR	Manual	Hydraulic Oil According to DIN 51524	Pressure Valve	n/a	Industrial Systems Division Europe	Port B, Y depressurized	60 °C	-20 °C	650 L/min	Pilot	n/a	350 bar	N/A	NBR	NG32 / CETOP 10	N/A	Drain line external from subplate	350 bar	Acorn nut with lead seal	Port A, X 350 BAR; port B, Y depressurized
026-95769-H	Backordered	POR	7.7 kg	Cast Iron	Subplate	NBR	Manual	Hydraulic Oil According to DIN 51524	Pressure Valve	n/a	Industrial Systems Division Europe	350 bar Port A, X	60 °C	-20 °C	650 L/min	Pilot	n/a	350 bar	24 VDC	NBR	NG32 / CETOP 10	Vent function: solenoid not active, unpressurized circulation	Drain line internal	350 bar	Hand knob	Port A, X 350 BAR; port B, Y depressurized
026-96641-0	Backordered	POR	6 kg	Cast Iron	Subplate	NBR	Manual	Hydraulic Oil According to DIN 51524	Pressure Valve	n/a	Industrial Systems Division Europe	Port B, Y depressurized	60 °C	-20 °C	650 L/min	Pilot	n/a	350 bar	N/A	NBR	NG32 / CETOP 10	N/A	Drain line internal	350 bar	Acorn nut with lead seal	Port A, X 350 BAR; port B, Y depressurized
056-40145-H	Backordered	POR	6.2 kg	Cast Iron	Subplate	NBR	Manual	Hydraulic Oil According to DIN 51524	Pressure Valve	n/a	Industrial Systems Division Europe	Port B, Y depressurized	60 °C	-20 °C	350 L/min	Pilot	n/a	350 bar	24 VDC	NBR	NG25 / CETOP 08	Vent function: solenoid activated, unpressurized circulation	Drain line internal	350 bar	Acorn nut with lead seal	Port A, X 350 BAR; port B, Y depressurized
056-40174-0	Backordered	POR	7.7 kg	Cast Iron	Subplate	NBR	Manual	Hydraulic Oil According to DIN 51524	Pressure Valve	n/a	Industrial Systems Division Europe	Port B, Y depressurized	60 °C	-20 °C	650 L/min	Pilot	n/a	210 bar	98 VDC	NBR	NG32 / CETOP 10	Vent function: solenoid not active, unpressurized circulation	Drain line internal	210 bar	Acorn nut with lead seal	Port A, X 350 BAR; port B, Y depressurized
056-40319-0	Backordered	POR	2.7 kg	Cast Iron	Subplate	NBR	Manual	Hydraulic Oil According to DIN 51524	Pressure Valve	n/a	Industrial Systems Division Europe	Port B, Y depressurized	60 °C	-20 °C	150 L/min	Pilot	n/a	210 bar	N/A	NBR	NG10 / CETOP 05	N/A	Drain line external from subplate	210 bar	Acorn nut with lead seal	Port A, X 350 BAR; port B, Y depressurized
056-40340-B	Backordered	POR	7.7 kg	Cast Iron	Subplate	NBR	Manual	Hydraulic Oil According to DIN 51524	Pressure Valve	n/a	Industrial Systems Division Europe	350 bar Port A, X	60 °C	-20 °C	650 L/min	Pilot	50/60 Hz	210 bar	110/120 VAC	NBR	NG32 / CETOP 10	Vent function: solenoid activated, unpressurized circulation	Drain line external from subplate	210 bar	Hand knob	Port A, X 350 BAR; port B, Y depressurized
R4U03-5311009GAGA1	Backordered	POR	4.4 kg	Cast Iron	Subplate mounting	NBR	Manually	Hydraulic Oil According to DIN 51524	Pressure Valve	n/a	Industrial Systems Division Europe	Port A, X 350; port B, Y depressurized	60 °C	-20 °C	150 L/min	Pilot	n/a	105 bar	205 VDC	NBR	NG10 / CETOP 05	Vent function: solenoid not active, unpressurized circulation	Drain line internal	105 bar	Hand knob	Port A, X 350 BAR; port B, Y depressurized
R4U03-5311009GARA1	Backordered	POR	4.4 kg	Cast Iron	Subplate mounting	NBR	Manually	Hydraulic Oil According to DIN 51524	Pressure Valve	n/a	Industrial Systems Division Europe	Port A, X 350; port B, Y depressurized	60 °C	-20 °C	150 L/min	Pilot	n/a	105 bar	98 VDC	NBR	NG10 / CETOP 05	Vent function: solenoid not active, unpressurized circulation	Drain line internal	105 bar	Hand knob	Port A, X 350 BAR; port B, Y depressurized
R4U03-5311109G0QA1	Backordered	POR	4.4 kg	Cast Iron	Subplate mounting	NBR	Manually	Hydraulic Oil According to DIN 51524	Pressure Valve	n/a	Industrial Systems Division Europe	Port A, X 350; port B, Y depressurized	60 °C	-20 °C	150 L/min	Pilot	n/a	105 bar	24 VDC	NBR	NG10 / CETOP 05	Vent function: solenoid not active, unpressurized circulation	Drain line external from subplate	105 bar	Hand knob	Port A, X 350 BAR; port B, Y depressurized
R4U03-5313111G0QA1	Backordered	POR	4.4 kg	Cast Iron	Subplate mounting	NBR	Manually	Hydraulic Oil According to DIN 51524	Pressure Valve	n/a	Industrial Systems Division Europe	Port A, X 350; port B, Y depressurized	60 °C	-20 °C	150 L/min	Pilot	n/a	105 bar	24 VDC	NBR	NG10 / CETOP 05	Vent function: solenoid activated, unpressurized circulation	Drain line external from subplate	105 bar	Acorn nut with lead seal	Port A, X 350 BAR; port B, Y depressurized
R4U03-5331011G0QA1	Backordered	POR	4.4 kg	Cast Iron	Subplate mounting	NBR	Manually	Hydraulic Oil According to DIN 51524	Pressure Valve	n/a	Industrial Systems Division Europe	Port A, X 350; port B, Y depressurized	60 °C	-20 °C	150 L/min	Pilot	n/a	210 bar	24 VDC	NBR	NG10 / CETOP 05	Vent function: solenoid activated, unpressurized circulation	Drain line internal	210 bar	Hand knob	Port A, X 350 BAR; port B, Y depressurized
R4U03-5331011W30A1	Backordered	POR	4.4 kg	Cast Iron	Subplate mounting	NBR	Manually	Hydraulic Oil According to DIN 51524	Pressure Valve	n/a	Industrial Systems Division Europe	Port A, X 350; port B, Y depressurized	60 °C	-20 °C	150 L/min	Pilot	50/60	350 bar	110/120 VAC	NBR	NG10 / CETOP 05	Vent function: solenoid activated, unpressurized circulation	Drain line internal	210 bar	Hand knob	Port A, X 350 BAR; port B, Y depressurized
R4U03-5331011W31A1	Backordered	POR	4.4 kg	Cast Iron	Subplate mounting	NBR	Manually	Hydraulic Oil According to DIN 51524	Pressure Valve	n/a	Industrial Systems Division Europe	Port A, X 350; port B, Y depressurized	60 °C	-20 °C	150 L/min	Pilot	50/60	350 bar	230/240 VAC	NBR	NG10 / CETOP 05	Vent function: solenoid activated, unpressurized circulation	Drain line internal	210 bar	Hand knob	Port A, X 350 BAR; port B, Y depressurized
R4U03-5331109G0QA1	Backordered	POR	4.4 kg	Cast Iron	Subplate mounting	NBR	Manually	Hydraulic Oil According to DIN 51524	Pressure Valve	n/a	Industrial Systems Division Europe	Port A, X 350; port B, Y depressurized	60 °C	-20 °C	150 L/min	Pilot	n/a	210 bar	24 VDC	NBR	NG10 / CETOP 05	Vent function: solenoid not active, unpressurized circulation	Drain line external from subplate	210 bar	Hand knob	Port A, X 350 BAR; port B, Y depressurized
R4U03-5333009G0QA5	Backordered	POR	4.4 kg	Cast Iron	Subplate mounting	FPM	Manually	Water Glycol	Pressure Valve	n/a	Industrial Systems Division Europe	Port A, X 350; port B, Y depressurized	60 °C	-20 °C	150 L/min	Pilot	n/a	210 bar	24 VDC	FPM	NG10 / CETOP 05	Vent function: solenoid not active, unpressurized circulation	Drain line internal	210 bar	Acorn nut with lead seal	Port A, X 350 BAR; port B, Y depressurized
R4U03-5351009W30A1	Backordered	POR	4.4 kg	Cast Iron	Subplate mounting	NBR	Manually	Hydraulic Oil According to DIN 51524	Pressure Valve	n/a	Industrial Systems Division Europe	Port A, X 350; port B, Y depressurized	60 °C	-20 °C	150 L/min	Pilot	50/60 Hz	350 bar	110/120 VAC	NBR	NG10 / CETOP 05	Vent function: solenoid not active, unpressurized circulation	Drain line internal	350 bar	Hand knob	Port A, X 350 BAR; port B, Y depressurized
R4U03-5351011G0QA1	Backordered	POR	4.4 kg	Cast Iron	Subplate mounting	NBR	Manually	Hydraulic Oil According to DIN 51524	Pressure Valve	n/a	Industrial Systems Division Europe	Port A, X 350; port B, Y depressurized	60 °C	-20 °C	150 L/min	Pilot	n/a	350 bar	24 VDC	NBR	NG10 / CETOP 05	Vent function: solenoid activated, unpressurized circulation	Drain line internal	350 bar	Hand knob	Port A, X 350 BAR; port B, Y depressurized

Unloading Valve, Subplate Mounting - Series R4U

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