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	Mounting Type	Seal Material	Actuation Type	Operation Type	Product Series	For Fluid Type	Maximum Operating Pressure	Weight	Body Material	Flow Rate	Frequency	Maximum Pressure Setting	Seal Material	Port Connection	Drain Option	Input Voltage	Switching Option	Pressure Control Range	Maximum Operating Pressure	Pressure Adjustment Control Type
016-65059-0	Backordered	POR	n/a	Industrial Systems Division Europe	60 °C	-20 °C	Subplate	NBR	Manual	Pilot	Pressure Valve	Hydraulic Oil According to DIN 51524	350 bar Port A, X	2.7 kg	Cast Iron	150 L/min	n/a	350 bar	NBR	NG10 / CETOP 05	Drain line internal	N/A	N/A	350 bar	Port A, X 350 BAR; port B, Y depressurized	Hand knob
016-65107-0	Backordered	POR	n/a	Industrial Systems Division Europe	60 °C	-20 °C	Subplate	NBR	Manual	Pilot	Pressure Valve	Hydraulic Oil According to DIN 51524	350 bar Port A, X	2.7 kg	Cast Iron	150 L/min	n/a	105 bar	NBR	NG10 / CETOP 05	Drain line internal	N/A	N/A	105 bar	Port A, X 350 BAR; port B, Y depressurized	Hand knob
016-65269-0	Backordered	POR	n/a	Industrial Systems Division Europe	60 °C	-20 °C	Subplate	NBR	Manual	Pilot	Pressure Valve	Hydraulic Oil According to DIN 51524	Port B, Y depressurized	4.5 kg	Cast Iron	350 L/min	n/a	350 bar	NBR	NG25 / CETOP 08	Drain line internal	N/A	N/A	350 bar	Port A, X 350 BAR; port B, Y depressurized	Hand knob
016-65270-0	Backordered	POR	n/a	Industrial Systems Division Europe	60 °C	-20 °C	Subplate	NBR	Manual	Pilot	Pressure Valve	Hydraulic Oil According to DIN 51524	350 bar Port A, X	4.5 kg	Cast Iron	350 L/min	n/a	105 bar	NBR	NG25 / CETOP 08	Drain line internal	N/A	N/A	105 bar	Port A, X 350 BAR; port B, Y depressurized	Hand knob
016-80279-0	Backordered	POR	n/a	Industrial Systems Division Europe	60 °C	-20 °C	Subplate	NBR	Manual	Pilot	Pressure Valve	Hydraulic Oil According to DIN 51524	350 bar Port A, X	6 kg	Cast Iron	650 L/min	n/a	105 bar	NBR	NG32 / CETOP 10	Drain line internal	N/A	N/A	105 bar	Port A, X 350 BAR; port B, Y depressurized	Hand knob
016-80284-0	Backordered	POR	n/a	Industrial Systems Division Europe	60 °C	-20 °C	Subplate	NBR	Manual	Pilot	Pressure Valve	Hydraulic Oil According to DIN 51524	350 bar Port A, X	6 kg	Cast Iron	650 L/min	n/a	350 bar	NBR	NG32 / CETOP 10	Drain line internal	N/A	N/A	350 bar	Port A, X 350 BAR; port B, Y depressurized	Hand knob
016-84354-0	Backordered	POR	n/a	Industrial Systems Division Europe	60 °C	-20 °C	Subplate	NBR	Manual	Pilot	Pressure Valve	Hydraulic Oil According to DIN 51524	Port B, Y depressurized	2.7 kg	Cast Iron	150 L/min	n/a	350 bar	NBR	NG10 / CETOP 05	Drain line external from subplate	N/A	N/A	350 bar	Port A, X 350 BAR; port B, Y depressurized	Hand knob
016-84529-0	Backordered	POR	n/a	Industrial Systems Division Europe	60 °C	-20 °C	Subplate	NBR	Manual	Pilot	Pressure Valve	Hydraulic Oil According to DIN 51524	Port B, Y depressurized	2.7 kg	Cast Iron	150 L/min	n/a	105 bar	NBR	NG10 / CETOP 05	Drain line external from subplate	N/A	N/A	105 bar	Port A, X 350 BAR; port B, Y depressurized	Hand knob
016-85050-0	Backordered	POR	n/a	Industrial Systems Division Europe	60 °C	-20 °C	Subplate	NBR	Manual	Pilot	Pressure Valve	Hydraulic Oil According to DIN 51524	350 bar Port A, X	6 kg	Cast Iron	650 L/min	n/a	210 bar	NBR	NG32 / CETOP 10	Drain line internal	N/A	N/A	210 bar	Port A, X 350 BAR; port B, Y depressurized	Hand knob
016-85050-5	Backordered	POR	n/a	Industrial Systems Division Europe	60 °C	-20 °C	Subplate	FPM	Manual	Pilot	Pressure Valve	Water-Glycol	350 bar Port A, X	6 kg	Cast Iron	650 L/min	n/a	210 bar	FPM	NG32 / CETOP 10	Drain line internal	N/A	N/A	210 bar	Port A, X 350 BAR; port B, Y depressurized	Hand knob
016-85322-0	Backordered	POR	n/a	Industrial Systems Division Europe	60 °C	-20 °C	Subplate	NBR	Manual	Pilot	Pressure Valve	Hydraulic Oil According to DIN 51524	Port B, Y depressurized	2.7 kg	Cast Iron	150 L/min	n/a	210 bar	NBR	NG10 / CETOP 05	Drain line internal	N/A	N/A	210 bar	Port A, X 350 BAR; port B, Y depressurized	Hand knob
016-85324-0	Backordered	POR	n/a	Industrial Systems Division Europe	60 °C	-20 °C	Subplate	NBR	Manual	Pilot	Pressure Valve	Hydraulic Oil According to DIN 51524	350 bar Port A, X	4.5 kg	Cast Iron	350 L/min	n/a	210 bar	NBR	NG25 / CETOP 08	Drain line internal	N/A	N/A	210 bar	Port A, X 350 BAR; port B, Y depressurized	Hand knob
016-85324-5	Backordered	POR	n/a	Industrial Systems Division Europe	60 °C	-20 °C	Subplate	FPM	Manual	Pilot	Pressure Valve	Water-Glycol	Port B, Y depressurized	4.5 kg	Cast Iron	350 L/min	n/a	210 bar	FPM	NG25 / CETOP 08	Drain line internal	N/A	N/A	210 bar	Port A, X 350 BAR; port B, Y depressurized	Hand knob
016-86456-0	Backordered	POR	n/a	Industrial Systems Division Europe	60 °C	-20 °C	Subplate	NBR	Manual	Pilot	Pressure Valve	Hydraulic Oil According to DIN 51524	Port B, Y depressurized	2.7 kg	Cast Iron	150 L/min	n/a	350 bar	NBR	NG10 / CETOP 05	Drain line external from subplate	N/A	N/A	350 bar	Port A, X 350 BAR; port B, Y depressurized	Acorn nut with lead seal
016-88472-0	Backordered	POR	n/a	Industrial Systems Division Europe	60 °C	-20 °C	Subplate	NBR	Manual	Pilot	Pressure Valve	Hydraulic Oil According to DIN 51524	350 bar Port A, X	2.7 kg	Cast Iron	150 L/min	n/a	210 bar	NBR	NG10 / CETOP 05	Drain line external from subplate	N/A	N/A	210 bar	Port A, X 350 BAR; port B, Y depressurized	Hand knob
016-88646-0	Backordered	POR	n/a	Industrial Systems Division Europe	60 °C	-20 °C	Subplate	NBR	Manual	Pilot	Pressure Valve	Hydraulic Oil According to DIN 51524	350 bar Port A, X	2.7 kg	Cast Iron	150 L/min	n/a	210 bar	NBR	NG10 / CETOP 05	Drain line internal	N/A	N/A	210 bar	Port A, X 350 BAR; port B, Y depressurized	Acorn nut with lead seal
016-91943-0	Backordered	POR	n/a	Industrial Systems Division Europe	60 °C	-20 °C	Subplate	NBR	Manual	Pilot	Pressure Valve	Hydraulic Oil According to DIN 51524	Port B, Y depressurized	2.7 kg	Cast Iron	150 L/min	n/a	105 bar	NBR	NG10 / CETOP 05	Drain line internal	N/A	N/A	105 bar	Port A, X 350 BAR; port B, Y depressurized	Acorn nut with lead seal
016-95016-0	Backordered	POR	n/a	Industrial Systems Division Europe	60 °C	-20 °C	Subplate	NBR	Manual	Pilot	Pressure Valve	Hydraulic Oil According to DIN 51524	350 bar Port A, X	4.5 kg	Cast Iron	350 L/min	n/a	105 bar	NBR	NG25 / CETOP 08	Drain line external from subplate	N/A	N/A	105 bar	Port A, X 350 BAR; port B, Y depressurized	Hand knob
016-95122-0	Backordered	POR	n/a	Industrial Systems Division Europe	60 °C	-20 °C	Subplate	NBR	Manual	Pilot	Pressure Valve	Hydraulic Oil According to DIN 51524	350 bar Port A, X	6 kg	Cast Iron	650 L/min	n/a	210 bar	NBR	NG32 / CETOP 10	Drain line external from subplate	N/A	N/A	210 bar	Port A, X 350 BAR; port B, Y depressurized	Hand knob
016-95286-0	Backordered	POR	n/a	Industrial Systems Division Europe	60 °C	-20 °C	Subplate	NBR	Manual	Pilot	Pressure Valve	Hydraulic Oil According to DIN 51524	350 bar Port A, X	4.5 kg	Cast Iron	350 L/min	n/a	350 bar	NBR	NG25 / CETOP 08	Drain line external from subplate	N/A	N/A	350 bar	Port A, X 350 BAR; port B, Y depressurized	Hand knob

Unloading Valve, Subplate Mounting - Series R4U

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