Direct Acting Relief Valves

*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’s selection of direct acting relief valves are fast acting and designed for continuous duty applications with pressures up to 420 bar (6000 psi) and flows up to 200 lpm (53 gpm) in a variety cavity sizes. The variety of pressure adjustment styles available makes these valves an economical solution for clipping pressure spikes and can handle up to full system flow if needed. Poppet style direct acting valves have low leak conditioned seats and are ideal port reliefs in cylinder control applications. Parker’s small, low flow, direct acting valves perform well when controlling pilot circuits or limiting load sense pressure.

Markets:
• Miscellaneous Industrial
• Miscellaneous Manufacturing
• Miscellaneous Mobile

Features/Benefits:
• Hardened, precision ground parts for durability
• Compact size for reduced space requirements
• Low leakage design poppet design available
• Fast response
• All external parts zinc plated
• High pressure (6000 psi) product available in some models
• Adjustable, fixed, or tamper resistant adjustments available
• Multiple spring ranges are available
• All valves are 100 % tested

Applications:
• Port/cross-port relief
• System relief
• Pilot and/or load sense relief
• Braking

Additional Technical Insight:
Full flow direct acting relief valves can be used as a main system relief valves in low flow circuits. Direct acting valves are fast acting, therefore, these devices and can be an economical solution for clipping pressure spikes. Poppet style direct acting valves have low leak conditioned seats and are often used as a port relief in a cylinder control applications. Small, low flow, direct acting valves are ideal for controlling pilot circuits or limiting load sense pressure.

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SKU	Availability	Price	Body Material	Weight	Maximum Operating Pressure	Seal Material	Division	Maximum Kinematic Viscosity	Minimum Operating Temperature	Actuation Type	Function	Configuration	Operation Type	Adjustment Mechanism	Wire Mesh Screen Included	Cavity Size	Flow Rate	Maximum Flow Rate	For Fluid Type	Maximum Operating Temperature	Valve Material	Operating Temperature	Filter Efficiency Rating	Mounting Type	Maximum Tank Pressure	Maximum Inlet Pressure Rating	Installation Torque	Leak Rate	Reseat Pressure	Pressure Control Range	Maximum Pressure Setting	Standard Setting Pressure	Pressure Control Sensitivity	Seal Material	Adjustment Mechanism	Flow Rate	Maximum Inlet Pressure Rating	Pressure Control Range
RD102T09N	Backordered	POR	N/A	0.23 kg	250 bar	Nitrile	Hydraulic Systems Division	45-2000 SSU (6 to 420 cSt)	-34 °C	Pressure Sensing	Direct Acting	Pressure Relief	Automatic	Tamper Resistant	n/a	C10-2	10 Gal/min	10 Gal/min	Mineral-based or synthetic hydraulic fluids	+250 °F	All parts steel. All operating parts hardened steel	-30 to +250 °F	ISO 4406 18/16/13, SAE Class 4	Screw in cartridge valve	3000 psi	3600 psi	37-41 lb-ft	0.33 @ 75% Crack Pressure cm3/min	85% of pressure setting	6.9-62 bar	62 bar	450 psi	7.2 per turn bar	Nitrile	Tamper Resistant	10 GAL/MIN, 38 L/MIN	3600 PSI, 250 BAR	100-900 PSI, 7-62 BAR
RD102T18	3 in stock	POR	N/A	0.23 kg	3600 psi	D-Ring (Standard)	Hydraulic Systems Division	45-2000 SSU (6 to 420 cSt)	-35 °F	Pressure Sensing	Direct Acting	Pressure Relief	Automatic	Tamper Resistant	n/a	C10-2	10 Gal/min	38 L/min	Mineral-based or synthetic hydraulic fluids	+200 °F	All parts steel. All operating parts hardened steel	-35 to +200 °F	ISO 4406 18/16/13, SAE Class 4	Screw in cartridge valve	210 bar	3600 psi	37-41 lb-ft	0.33 @ 75% Crack Pressure cm3/min	85% of pressure setting	200-1800 psi	1800 psi	62 bar	16 per turn bar	D-Ring (Standard)	Tamper Resistant	10 GAL/MIN, 38 L/MIN	3600 PSI, 250 BAR	200-1800 PSI, 13.8-124 BAR
RD102T18V	Backordered	POR	N/A	0.5 lb	3600 psi	Fluorocarbon	Hydraulic Systems Division	45-2000 SSU (6 to 420 cSt)	-26 °C	Pressure Sensing	Direct Acting	Pressure Relief	Automatic	Tamper Resistant	n/a	C10-2	10 Gal/min	38 L/min	Mineral-based or synthetic hydraulic fluids	+400 °F	All parts steel. All operating parts hardened steel	-26 to +204 °C	ISO 4406 18/16/13, SAE Class 4	Screw in cartridge valve	210 bar	250 bar	50-56 Nm	5 @ 75% Crack Pressure drops/min	85% of pressure setting	13.8-124 bar	124 bar	62 bar	234 per turn psi	Fluorocarbon	Tamper Resistant	10 GAL/MIN, 38 L/MIN	3600 PSI, 250 BAR	200-1800 PSI, 13.8-124 BAR
RD102T30	Backordered	POR	N/A	0.23 kg	3600 psi	D-Ring (Standard)	Hydraulic Systems Division	45-2000 SSU (6 to 420 cSt)	-35 °F	Pressure Sensing	Direct Acting	Pressure Relief	Automatic	Tamper Resistant	n/a	C10-2	10 Gal/min	38 L/min	Mineral-based or synthetic hydraulic fluids	+200 °F	All parts steel. All operating parts hardened steel	-35 to +200 °F	ISO 4406 18/16/13, SAE Class 4	Screw in cartridge valve	210 bar	3600 psi	37-41 lb-ft	5 @ 75% Crack Pressure drops/min	85% of pressure setting	600-3000 psi	3000 psi	103.4 bar	1500 per turn psi	D-Ring (Standard)	Tamper Resistant	10 GAL/MIN, 38 L/MIN	3600 PSI, 250 BAR	600-3000 PSI, 41.4-210 BAR
RD102T30V	Backordered	POR	N/A	0.5 lb	3600 psi	Fluorocarbon	Hydraulic Systems Division	45-2000 SSU (6 to 420 cSt)	-15 °F	Pressure Sensing	Direct Acting	Pressure Relief	Automatic	Tamper Resistant	n/a	C10-2	10 Gal/min	10 Gal/min	Mineral-based or synthetic hydraulic fluids	+204 °C	All parts steel. All operating parts hardened steel	-26 to +204 °C	ISO 4406 18/16/13, SAE Class 4	Screw in cartridge valve	3000 psi	250 bar	50-56 Nm	0.33 @ 75% Crack Pressure cm3/min	85% of pressure setting	41.4-210 bar	3000 psi	103.4 bar	1500 per turn psi	Fluorocarbon	Tamper Resistant	10 GAL/MIN, 38 L/MIN	3600 PSI, 250 BAR	600-3000 PSI, 41.4-210 BAR
RDH042K30	Backordered	POR	N/A	0.03 kg	5500 psi	Nitrile	Hydraulic Systems Division	45-2000 SSU (6 to 420 cSt)	-34 °C	Pressure Sensing	Direct Acting	Pressure Relief	Automatic	Knob	n/a	C04-2	3.8 L/min	3.8 L/min	Mineral-based or synthetic hydraulic fluids	+121 °C	All parts steel. All operating parts hardened steel	-30 to +250 °F	ISO 4406 18/16/13, SAE Class 4	Screw in cartridge valve	5000 psi	5500 psi	7 lb-ft	0.66 @ 75% Crack Pressure cm3/min	80% of pressure setting	6.9-210 bar	210 bar	1500 psi	105 per turn bar	Nitrile	Knob	1 GAL/MIN, 3.8 L/MIN	5500 PSI, 380 BAR	100-3000 PSI, 6.9-210 BAR
RDH042K30V	Backordered	POR	N/A	0.07 lb	380 bar	Fluorocarbon	Hydraulic Systems Division	45-2000 SSU (6 to 420 cSt)	-15 °F	Pressure Sensing	Direct Acting	Pressure Relief	Automatic	Knob	n/a	C04-2	3.8 L/min	3.8 L/min	Mineral-based or synthetic hydraulic fluids	+400 °F	All parts steel. All operating parts hardened steel	-26 to +204 °C	ISO 4406 18/16/13, SAE Class 4	Screw in cartridge valve	350 bar	380 bar	7 lb-ft	10 @ 75% Crack Pressure drops/min	80% of pressure setting	6.9-210 bar	210 bar	103.4 bar	1522 per turn psi	Fluorocarbon	Knob	1 GAL/MIN, 3.8 L/MIN	5500 PSI, 380 BAR	100-3000 PSI, 6.9-210 BAR
RDH042K50	Backordered	$82.20	N/A	0.03 kg	5500 psi	Nitrile	Hydraulic Systems Division	45-2000 SSU (6 to 420 cSt)	-34 °C	Pressure Sensing	Direct Acting	Pressure Relief	Automatic	Knob	n/a	C04-2	3.8 L/min	1 Gal/min	Mineral-based or synthetic hydraulic fluids	+250 °F	All parts steel. All operating parts hardened steel	-30 to +250 °F	ISO 4406 18/16/13, SAE Class 4	Screw in cartridge valve	350 bar	380 bar	10 Nm	0.66 @ 75% Crack Pressure cm3/min	80% of pressure setting	1500-5000 psi	5000 psi	172.4 bar	118 per turn bar	Nitrile	Knob	1 GAL/MIN, 3.8 L/MIN	5500 PSI, 380 BAR	1500-5000 PSI, 103-350 BAR
RDH042K50V	Backordered	POR	N/A	0.07 lb	380 bar	Fluorocarbon	Hydraulic Systems Division	45-2000 SSU (6 to 420 cSt)	-26 °C	Pressure Sensing	Direct Acting	Pressure Relief	Automatic	Knob	n/a	C04-2	3.8 L/min	3.8 L/min	Mineral-based or synthetic hydraulic fluids	+204 °C	All parts steel. All operating parts hardened steel	-26 to +204 °C	ISO 4406 18/16/13, SAE Class 4	Screw in cartridge valve	5000 psi	5500 psi	7 lb-ft	10 @ 75% Crack Pressure drops/min	80% of pressure setting	1500-5000 psi	350 bar	172.4 bar	118 per turn bar	Fluorocarbon	Knob	1 GAL/MIN, 3.8 L/MIN	5500 PSI, 380 BAR	1500-5000 PSI, 103-350 BAR
RDH042S30	Backordered	$67.80	N/A	0.03 kg	380 bar	Nitrile	Hydraulic Systems Division	45-2000 SSU (6 to 420 cSt)	-30 °F	Pressure Sensing	Direct Acting	Pressure Relief	Automatic	Screw	n/a	C04-2	3.8 L/min	1 Gal/min	Mineral-based or synthetic hydraulic fluids	+250 °F	All parts steel. All operating parts hardened steel	-34 to +121 °C	ISO 4406 18/16/13, SAE Class 4	Screw in cartridge valve	350 bar	380 bar	7 lb-ft	0.66 @ 75% Crack Pressure cm3/min	80% of pressure setting	6.9-210 bar	3000 psi	1500 psi	1522 per turn psi	Nitrile	Screw	1 GAL/MIN, 3.8 L/MIN	5500 PSI, 380 BAR	100-3000 PSI, 6.9-210 BAR
RDH042S30V	Backordered	POR	N/A	0.03 kg	380 bar	Fluorocarbon	Hydraulic Systems Division	45-2000 SSU (6 to 420 cSt)	-26 °C	Pressure Sensing	Direct Acting	Pressure Relief	Automatic	Screw	n/a	C04-2	1 Gal/min	1 Gal/min	Mineral-based or synthetic hydraulic fluids	+204 °C	All parts steel. All operating parts hardened steel	-15 to +400 °F	ISO 4406 18/16/13, SAE Class 4	Screw in cartridge valve	5000 psi	5500 psi	7 lb-ft	0.66 @ 75% Crack Pressure cm3/min	80% of pressure setting	6.9-210 bar	210 bar	1500 psi	1522 per turn psi	Fluorocarbon	Screw	1 GAL/MIN, 3.8 L/MIN	5500 PSI, 380 BAR	100-3000 PSI, 6.9-210 BAR
RDH042S50	Backordered	POR	N/A	0.07 lb	380 bar	Nitrile	Hydraulic Systems Division	45-2000 SSU (6 to 420 cSt)	-34 °C	Pressure Sensing	Direct Acting	Pressure Relief	Automatic	Screw	n/a	C04-2	3.8 L/min	1 Gal/min	Mineral-based or synthetic hydraulic fluids	+250 °F	All parts steel. All operating parts hardened steel	-34 to +121 °C	ISO 4406 18/16/13, SAE Class 4	Screw in cartridge valve	350 bar	5500 psi	10 Nm	0.66 @ 75% Crack Pressure cm3/min	80% of pressure setting	1500-5000 psi	350 bar	2500 psi	118 per turn bar	Nitrile	Screw	1 GAL/MIN, 3.8 L/MIN	5500 PSI, 380 BAR	1500-5000 PSI, 103-350 BAR
RDH042S50V	Backordered	POR	N/A	0.03 kg	380 bar	Fluorocarbon	Hydraulic Systems Division	45-2000 SSU (6 to 420 cSt)	-26 °C	Pressure Sensing	Direct Acting	Pressure Relief	Automatic	Screw	n/a	C04-2	3.8 L/min	1 Gal/min	Mineral-based or synthetic hydraulic fluids	+400 °F	All parts steel. All operating parts hardened steel	-15 to +400 °F	ISO 4406 18/16/13, SAE Class 4	Screw in cartridge valve	350 bar	5500 psi	10 Nm	0.66 @ 75% Crack Pressure cm3/min	80% of pressure setting	103.4-350 bar	5000 psi	172.4 bar	118 per turn bar	Fluorocarbon	Screw	1 GAL/MIN, 3.8 L/MIN	5500 PSI, 380 BAR	1500-5000 PSI, 103-350 BAR
RDH042T30	Backordered	POR	N/A	0.03 kg	380 bar	Nitrile	Hydraulic Systems Division	45-2000 SSU (6 to 420 cSt)	-30 °F	Pressure Sensing	Direct Acting	Pressure Relief	Automatic	Tamper Resistant	n/a	C04-2	1 Gal/min	1 Gal/min	Mineral-based or synthetic hydraulic fluids	+121 °C	All parts steel. All operating parts hardened steel	-30 to +250 °F	ISO 4406 18/16/13, SAE Class 4	Screw in cartridge valve	350 bar	380 bar	10 Nm	0.66 @ 75% Crack Pressure cm3/min	80% of pressure setting	100-3000 psi	3000 psi	103.4 bar	1522 per turn psi	Nitrile	Tamper Resistant	1 GAL/MIN, 3.8 L/MIN	5500 PSI, 380 BAR	100-3000 PSI, 6.9-210 BAR
RDH042T50	Backordered	POR	N/A	0.07 lb	5500 psi	Nitrile	Hydraulic Systems Division	45-2000 SSU (6 to 420 cSt)	-30 °F	Pressure Sensing	Direct Acting	Pressure Relief	Automatic	Tamper Resistant	n/a	C04-2	3.8 L/min	3.8 L/min	Mineral-based or synthetic hydraulic fluids	+121 °C	All parts steel. All operating parts hardened steel	-34 to +121 °C	ISO 4406 18/16/13, SAE Class 4	Screw in cartridge valve	5000 psi	380 bar	10 Nm	10 @ 75% Crack Pressure drops/min	80% of pressure setting	103.4-350 bar	350 bar	2500 psi	1710 per turn psi	Nitrile	Tamper Resistant	1 GAL/MIN, 3.8 L/MIN	5500 PSI, 380 BAR	1500-5000 PSI, 103-350 BAR
RDH081K10	Backordered	$67.80	N/A	0.09 kg	380 bar	D-Ring (Standard)	Hydraulic Systems Division	45-2000 SSU (6 to 420 cSt)	-37 °C	Pressure Sensing	Direct Acting	Pressure Relief	Automatic	Knob	n/a	C08-2	1.9 L/min	0.5 Gal/min	Mineral-based or synthetic hydraulic fluids	+200 °F	All parts steel. All operating parts hardened steel	-35 to +200 °F	ISO 4406 18/16/13, SAE Class 4	Screw in cartridge valve	5000 psi	380 bar	43-49 Nm	0.33 @ 75% Crack Pressure cm3/min	90% of pressure setting	100-1000 psi	1000 psi	34.5 bar	19.6 per turn bar	D-Ring (Standard)	Knob	0.5 GAL/MIN, 1.9 L/MIN	5500 PSI, 380 BAR	100-1000 PSI, 6.9-69 BAR
RDH081K10N	Backordered	$73.80	N/A	0.2 lb	380 bar	Nitrile	Hydraulic Systems Division	45-2000 SSU (6 to 420 cSt)	-30 °F	Pressure Sensing	Direct Acting	Pressure Relief	Automatic	Knob	n/a	C08-2	1.9 L/min	1.9 L/min	Mineral-based or synthetic hydraulic fluids	+121 °C	All parts steel. All operating parts hardened steel	-34 to +121 °C	ISO 4406 18/16/13, SAE Class 4	Screw in cartridge valve	350 bar	5500 psi	43-49 Nm	0.33 @ 75% Crack Pressure cm3/min	90% of pressure setting	100-1000 psi	69 bar	500 psi	19.6 per turn bar	Nitrile	Knob	0.5 GAL/MIN, 1.9 L/MIN	5500 PSI, 380 BAR	100-1000 PSI, 6.9-69 BAR
RDH081K10V	Backordered	$73.80	N/A	0.09 kg	380 bar	Fluorocarbon	Hydraulic Systems Division	45-2000 SSU (6 to 420 cSt)	-26 °C	Pressure Sensing	Direct Acting	Pressure Relief	Automatic	Knob	n/a	C08-2	0.5 Gal/min	1.9 L/min	Mineral-based or synthetic hydraulic fluids	+204 °C	All parts steel. All operating parts hardened steel	-15 to +400 °F	ISO 4406 18/16/13, SAE Class 4	Screw in cartridge valve	5000 psi	380 bar	43-49 Nm	5 @ 75% Crack Pressure drops/min	90% of pressure setting	100-1000 psi	69 bar	34.5 bar	285 per turn psi	Fluorocarbon	Knob	0.5 GAL/MIN, 1.9 L/MIN	5500 PSI, 380 BAR	100-1000 PSI, 6.9-69 BAR
RDH081K30	Backordered	$67.80	N/A	0.2 lb	380 bar	D-Ring (Standard)	Hydraulic Systems Division	45-2000 SSU (6 to 420 cSt)	-35 °F	Pressure Sensing	Direct Acting	Pressure Relief	Automatic	Knob	n/a	C08-2	0.5 Gal/min	0.5 Gal/min	Mineral-based or synthetic hydraulic fluids	+93 °C	All parts steel. All operating parts hardened steel	-37 to +93 °C	ISO 4406 18/16/13, SAE Class 4	Screw in cartridge valve	5000 psi	5500 psi	32-36 lb-ft	0.33 @ 75% Crack Pressure cm3/min	90% of pressure setting	200-3000 psi	210 bar	1500 psi	58.9 per turn bar	D-Ring (Standard)	Knob	0.5 GAL/MIN, 1.9 L/MIN	5500 PSI, 380 BAR	200-3000 PSI, 13.8-210 BAR
RDH081K30N	Backordered	$73.80	N/A	0.09 kg	5500 psi	Nitrile	Hydraulic Systems Division	45-2000 SSU (6 to 420 cSt)	-30 °F	Pressure Sensing	Direct Acting	Pressure Relief	Automatic	Knob	n/a	C08-2	0.5 Gal/min	1.9 L/min	Mineral-based or synthetic hydraulic fluids	+250 °F	All parts steel. All operating parts hardened steel	-34 to +121 °C	ISO 4406 18/16/13, SAE Class 4	Screw in cartridge valve	5000 psi	5500 psi	32-36 lb-ft	5 @ 75% Crack Pressure drops/min	90% of pressure setting	13.8-210 bar	210 bar	103.4 bar	58.9 per turn bar	Nitrile	Knob	0.5 GAL/MIN, 1.9 L/MIN	5500 PSI, 380 BAR	200-3000 PSI, 13.8-210 BAR

Direct Acting Relief Valves

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