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.

View as Grid List

Sort by

Display per page

Part No.	Availability	Partner Available	Price	Maximum Operating Pressure	Seal Material	Filter Efficiency Rating	Valve Material	Maximum Kinematic Viscosity	Weight	Function	Adjustment Mechanism	Maximum Pressure Setting	Maximum Inlet Pressure Rating	Pressure Control Sensitivity	Maximum Tank Pressure	Configuration	For Fluid Type	Maximum Operating Temperature	Cavity Size	Pressure Control Range	Standard Setting Pressure	Leak Rate	Mounting Type	Operation Type	Maximum Flow Rate	Body Material	Operating Temperature	Minimum Operating Temperature	Installation Torque	Division	Reseat Pressure	Flow Rate	Actuation Type	Wire Mesh Screen Included	Seal Material	Flow Rate	Adjustment Mechanism	Maximum Inlet Pressure Rating	Pressure Control Range
A02A2PWN	Quote Required	Quote Required	TBD	420 bar	Nitrile	SAE Class 4	Hardened Steel	45-2000 SSU (6 to 420 cSt)	0.24 lb	Direct Acting	Knob	6000 psi	420 bar	800	420 bar	Pressure Relief	Synthetic Hydraulic Fluids	250 °F	C08-2	145 to 6000 psi	200 bar	5	Screw-in Cartridge	Automatic	1.6 Gal/min	n/a	-34 to 121 °C	-30 °F	40 Nm	Mobile Hydraulic Systems Division Europe	n/a	1.6 Gal/min	Pressure Sensing	n/a	Nitrile	1.6 GAL/MIN, 6 L/MIN	Knob	6000 PSI, 420 BAR	145-6000 PSI, 10-420 BAR
A02B2HZN	Quote Required	Quote Required	$145.75/each	6000 psi	Nitrile	ISO 4406 18/16/13	Steel (all parts)	45-2000 SSU (6 to 420 cSt)	0.44 lb	Direct Acting	Screw	6000 psi	3000 psi	435 psi Per Turn	420 bar	Pressure Relief	Mineral-based Hydraulic Fluids	250 °F	C08-2	72 to 3000 psi	100 bar	5 drops/min @ 1450 Psi (100 bar)	Screw-in Cartridge	Automatic	8 Gal/min	n/a	-34 to 121 °C	-34 °C	40 Nm	Mobile Hydraulic Systems Division Europe	n/a	30 L/min	Pressure Sensing	n/a	Nitrile	8 GAL/MIN, 30 L/MIN	Screw	6000 PSI, 420 BAR	72-3000 PSI, 5-210 BAR
A02B2PZN	Quote Required	Quote Required	$153.25/each	420 bar	Nitrile	SAE Class 4	Steel	45-2000 SSU (6 to 420 cSt)	0.2 kg	Direct Acting	Screw	6000 psi	420 bar	800	6000 psi	Pressure Relief	Mineral-based Hydraulic Fluids	250 °F	C08-2	5 to 420 bar	200 bar	5	Screw-in Cartridge	Automatic	30 L/min	n/a	-30 to 250 °F	-30 °F	30 lb-ft	Mobile Hydraulic Systems Division Europe	n/a	8 Gal/min	Pressure Sensing	n/a	Nitrile	8 GAL/MIN, 30 L/MIN	Screw	6000 PSI, 420 BAR	72-6000 PSI, 5-420 BAR
A04B2HWV	Quote Required	Quote Required	TBD	6000	Fluorocarbon	ISO 4406 18/16/13	Steel (all parts)	45-2000 SSU (6 to 420 cSt)	0.62	Direct Acting	Knob	3000	6000	305 psi Per Turn	6000	Pressure Relief	Mineral-based Hydraulic Fluids	400	C10-2	72 to 3000	1450	5 drops/min @ 1450 Psi (100 bar)	Screw-in Cartridge	Automatic	26	n/a	-15 to 400	-15	37	Mobile Hydraulic Systems Division Europe	n/a	26	Pressure Sensing	n/a	Fluorocarbon	28 GAL/MIN, 100 L/MIN	Knob	6000 PSI, 420 BAR	72-3000 PSI, 5-210 BAR
A04B2HZN	Quote Required	4 In Stock	$120.35/each	420 bar	Nitrile	ISO 4406 18/16/13	Steel (all parts)	45-2000 SSU (6 to 420 cSt)	0.62 lb	Direct Acting	Screw	3000 psi	420 bar	305 psi Per Turn	420 bar	Pressure Relief	Synthetic Hydraulic Fluids	250 °F	C10-2	5 to 210 bar	100 bar	5 drops/min @ 1450 Psi (100 bar)	Screw-in Cartridge	Automatic	100 L/min	n/a	-34 to 121 °C	-30 °F	37 lb-ft	Mobile Hydraulic Systems Division Europe	n/a	100 L/min	Pressure Sensing	n/a	Nitrile	28 GAL/MIN, 100 L/MIN	Screw	6000 PSI, 420 BAR	72-3000 PSI, 5-210 BAR
A04B2HZV	Quote Required	Quote Required	$143.75/each	6000 psi	Fluorocarbon	SAE Class 4	Steel (all parts)	45-2000 SSU (6 to 420 cSt)	0.28 kg	Direct Acting	Screw	210 bar	6000 psi	21 bar Per Turn	420 bar	Pressure Relief	Mineral-based Hydraulic Fluids	400 °F	C10-2	72 to 3000 psi	100 bar	0.33 cm3/min @ 1450 Psi (100 bar)	Screw-in Cartridge	Automatic	26 Gal/min	n/a	-15 to 400 °F	-26 °C	37 lb-ft	Mobile Hydraulic Systems Division Europe	n/a	100 L/min	Pressure Sensing	n/a	Fluorocarbon	28 GAL/MIN, 100 L/MIN	Screw	6000 PSI, 420 BAR	72-3000 PSI, 5-210 BAR
A04B2PZN	Quote Required	2 Limited Stock	$132.97/each	6000 psi	Nitrile	SAE Class 4	Steel (all parts)	45-2000 SSU (6 to 420 cSt)	0.62 lb	Direct Acting	Screw	420 bar	420 bar	43.4 bar Per Turn	6000 psi	Pressure Relief	Mineral-based Hydraulic Fluids	121 °C	C10-2	72 to 6000 psi	2900 psi	0.33 cm3/min @ 1450 Psi (100 bar)	Screw-in Cartridge	Automatic	100 L/min	n/a	-34 to 121 °C	-34 °C	37 lb-ft	Mobile Hydraulic Systems Division Europe	n/a	26 Gal/min	Pressure Sensing	n/a	Nitrile	28 GAL/MIN, 100 L/MIN	Screw	6000 PSI, 420 BAR	72-6000 PSI, 5-420 BAR
RD102K30V	Quote Required	Quote Required	$74.25/each	3600 psi	Fluorocarbon	ISO 4406 18/16/13, SAE Class 4	All parts steel. All operating parts hardened steel	45-2000 SSU (6 to 420 cSt)	0.23 kg	Direct Acting	Knob	3000 psi	3600 psi	103.4 per turn bar	210 bar	Pressure Relief	Mineral-based or synthetic hydraulic fluids	+204 °C	C10-2	41.4-210 bar	103.4 bar	5 @ 75% Crack Pressure drops/min	Screw in cartridge valve	Automatic	38 L/min	N/A	-15 to +400 °F	-26 °C	37-41 lb-ft	Hydraulic Systems Division	85% of pressure setting	38 L/min	Pressure Sensing	N/A	Fluorocarbon	10 GAL/MIN, 38 L/MIN	Knob	3600 PSI, 250 BAR	600-3000 PSI, 41.4-210 BAR
RD102S03	Quote Required	122 In Stock	$68.04/each	3600 psi	D-Ring (Standard)	ISO 4406 18/16/13, SAE Class 4	All parts steel. All operating parts hardened steel	45-2000 SSU (6 to 420 cSt)	0.23 kg	Direct Acting	Screw	300 psi	250 bar	2.7 per turn bar	3000 psi	Pressure Relief	Mineral-based or synthetic hydraulic fluids	+200 °F	C10-2	50-300 psi	150 psi	0.33 @ 75% Crack Pressure cm3/min	Screw in cartridge valve	Automatic	38 L/min	N/A	-37 to +93 °C	-37 °C	50-56 Nm	Hydraulic Systems Division	85% of pressure setting	10 Gal/min	Pressure Sensing	N/A	D-Ring (Standard)	10 GAL/MIN, 38 L/MIN	Screw	3600 PSI, 250 BAR	50-300 PSI, 3.5-20.7 BAR
RD102S18	Quote Required	62 In Stock	$65.00/each	3600 psi	D-Ring (Standard)	ISO 4406 18/16/13, SAE Class 4	All parts steel. All operating parts hardened steel	45-2000 SSU (6 to 420 cSt)	0.5 lb	Direct Acting	Screw	124 bar	250 bar	16 per turn bar	210 bar	Pressure Relief	Mineral-based or synthetic hydraulic fluids	+200 °F	C10-2	200-1800 psi	900 psi	0.33 @ 75% Crack Pressure cm3/min	Screw in cartridge valve	Automatic	38 L/min	N/A	-37 to +93 °C	-35 °F	50-56 Nm	Hydraulic Systems Division	85% of pressure setting	10 Gal/min	Pressure Sensing	N/A	D-Ring (Standard)	10 GAL/MIN, 38 L/MIN	Screw	3600 PSI, 250 BAR	200-1800 PSI, 13.8-124 BAR
RD102S18N	Quote Required	Quote Required	$61.00/each	250 bar	Nitrile	ISO 4406 18/16/13, SAE Class 4	All parts steel. All operating parts hardened steel	45-2000 SSU (6 to 420 cSt)	0.5 lb	Direct Acting	Screw	124 bar	3600 psi	234 per turn psi	3000 psi	Pressure Relief	Mineral-based or synthetic hydraulic fluids	+250 °F	C10-2	200-1800 psi	62 bar	5 @ 75% Crack Pressure drops/min	Screw in cartridge valve	Automatic	10 Gal/min	N/A	-30 to +250 °F	-34 °C	50-56 Nm	Hydraulic Systems Division	85% of pressure setting	10 Gal/min	Pressure Sensing	N/A	Nitrile	10 GAL/MIN, 38 L/MIN	Screw	3600 PSI, 250 BAR	200-1800 PSI, 13.8-124 BAR
RD102S30	47 In Stock	71 In Stock	$53.25/each	3600 psi	D-Ring (Standard)	ISO 4406 18/16/13, SAE Class 4	All parts steel. All operating parts hardened steel	45-2000 SSU (6 to 420 cSt)	0.23 kg	Direct Acting	Screw	210 bar	3600 psi	103.4 per turn bar	210 bar	Pressure Relief	Mineral-based or synthetic hydraulic fluids	+200 °F	C10-2	41.4-210 bar	1500 psi	0.33 @ 75% Crack Pressure cm3/min	Screw in cartridge valve	Automatic	10 Gal/min	N/A	-35 to +200 °F	-37 °C	37-41 lb-ft	Hydraulic Systems Division	85% of pressure setting	38 L/min	Pressure Sensing	N/A	D-Ring (Standard)	10 GAL/MIN, 38 L/MIN	Screw	3600 PSI, 250 BAR	600-3000 PSI, 41.4-210 BAR
RD102S30V	Quote Required	9 In Stock	$68.72/each	3600 psi	Fluorocarbon	ISO 4406 18/16/13, SAE Class 4	All parts steel. All operating parts hardened steel	45-2000 SSU (6 to 420 cSt)	0.5 lb	Direct Acting	Screw	3000 psi	250 bar	103.4 per turn bar	210 bar	Pressure Relief	Mineral-based or synthetic hydraulic fluids	+400 °F	C10-2	41.4-210 bar	103.4 bar	5 @ 75% Crack Pressure drops/min	Screw in cartridge valve	Automatic	38 L/min	N/A	-26 to +204 °C	-26 °C	50-56 Nm	Hydraulic Systems Division	85% of pressure setting	38 L/min	Pressure Sensing	N/A	Fluorocarbon	10 GAL/MIN, 38 L/MIN	Screw	3600 PSI, 250 BAR	600-3000 PSI, 41.4-210 BAR
RD102T03	Quote Required	Quote Required	$67.75/each	3600 psi	D-Ring (Standard)	ISO 4406 18/16/13, SAE Class 4	All parts steel. All operating parts hardened steel	45-2000 SSU (6 to 420 cSt)	0.23 kg	Direct Acting	Tamper Resistant	20.7 bar	3600 psi	2.7 per turn bar	3000 psi	Pressure Relief	Mineral-based or synthetic hydraulic fluids	+200 °F	C10-2	50-300 psi	10.3 bar	5 @ 75% Crack Pressure drops/min	Screw in cartridge valve	Automatic	38 L/min	N/A	-37 to +93 °C	-37 °C	50-56 Nm	Hydraulic Systems Division	85% of pressure setting	10 Gal/min	Pressure Sensing	N/A	D-Ring (Standard)	10 GAL/MIN, 38 L/MIN	Tamper Resistant	3600 PSI, 250 BAR	50-300 PSI, 3.5-20.7 BAR
RDH081K50	Quote Required	Quote Required	$61.75/each	380 bar	D-Ring (Standard)	ISO 4406 18/16/13, SAE Class 4	All parts steel. All operating parts hardened steel	45-2000 SSU (6 to 420 cSt)	0.2 lb	Direct Acting	Knob	5000 psi	380 bar	1910 per turn psi	5000 psi	Pressure Relief	Mineral-based or synthetic hydraulic fluids	+200 °F	C08-2	13.8-350 bar	172.4 bar	0.33 @ 75% Crack Pressure cm3/min	Screw in cartridge valve	Automatic	0.5 Gal/min	N/A	-35 to +200 °F	-35 °F	32-36 lb-ft	Hydraulic Systems Division	90% of pressure setting	1.9 L/min	Pressure Sensing	N/A	D-Ring (Standard)	0.5 GAL/MIN, 1.9 L/MIN	Knob	5500 PSI, 380 BAR	200-5000 PSI, 13.8-350 BAR
RDH081S10	Quote Required	29 In Stock	$56.14/each	380 bar	D-Ring (Standard)	ISO 4406 18/16/13, SAE Class 4	All parts steel. All operating parts hardened steel	45-2000 SSU (6 to 420 cSt)	0.09 kg	Direct Acting	Screw	69 bar	5500 psi	285 per turn psi	5000 psi	Pressure Relief	Mineral-based or synthetic hydraulic fluids	+93 °C	C08-2	6.9-69 bar	34.5 bar	5 @ 75% Crack Pressure drops/min	Screw in cartridge valve	Automatic	1.9 L/min	N/A	-37 to +93 °C	-35 °F	43-49 Nm	Hydraulic Systems Division	90% of pressure setting	0.5 Gal/min	Pressure Sensing	N/A	D-Ring (Standard)	0.5 GAL/MIN, 1.9 L/MIN	Knob	5500 PSI, 380 BAR	100-1000 PSI, 6.9-69 BAR
RDH081S30	3 In Stock	16 In Stock	$46.00/each	380 bar	D-Ring (Standard)	ISO 4406 18/16/13, SAE Class 4	All parts steel. All operating parts hardened steel	45-2000 SSU (6 to 420 cSt)	0.09 kg	Direct Acting	Screw	210 bar	380 bar	58.9 per turn bar	350 bar	Pressure Relief	Mineral-based or synthetic hydraulic fluids	+200 °F	C08-2	13.8-210 bar	103.4 bar	0.33 @ 75% Crack Pressure cm3/min	Screw in cartridge valve	Automatic	0.5 Gal/min	N/A	-35 to +200 °F	-37 °C	43-49 Nm	Hydraulic Systems Division	90% of pressure setting	1.9 L/min	Pressure Sensing	N/A	D-Ring (Standard)	0.5 GAL/MIN, 1.9 L/MIN	Screw	5500 PSI, 380 BAR	200-3000 PSI, 13.8-210 BAR
RDH081S30N	Quote Required	7 In Stock	$64.99/each	380 bar	Nitrile	ISO 4406 18/16/13, SAE Class 4	All parts steel. All operating parts hardened steel	45-2000 SSU (6 to 420 cSt)	0.2 lb	Direct Acting	Screw	210 bar	380 bar	859 per turn psi	350 bar	Pressure Relief	Mineral-based or synthetic hydraulic fluids	+121 °C	C08-2	200-3000 psi	1500 psi	5 @ 75% Crack Pressure drops/min	Screw in cartridge valve	Automatic	0.5 Gal/min	N/A	-34 to +121 °C	-30 °F	43-49 Nm	Hydraulic Systems Division	90% of pressure setting	0.5 Gal/min	Pressure Sensing	N/A	Nitrile	0.5 GAL/MIN, 1.9 L/MIN	Screw	5500 PSI, 380 BAR	200-3000 PSI, 13.8-210 BAR
RDH082K15N	Quote Required	Quote Required	$90.50/each	5500 psi	Nitrile	ISO 4406 18/16/13, SAE Class 4	All parts steel. All operating parts hardened steel	45-2000 SSU (6 to 420 cSt)	0.18 kg	Direct Acting	Knob	1500 psi	380 bar	19.3 per turn bar	5000 psi	Pressure Relief	Mineral-based or synthetic hydraulic fluids	+121 °C	C08-2	100-1500 psi	750 psi	0.33 @ 75% Crack Pressure cm3/min	Screw in cartridge valve	Automatic	8 Gal/min	N/A	-30 to +250 °F	-34 °C	43-49 Nm	Hydraulic Systems Division	85% of pressure setting	30 L/min	Pressure Sensing	N/A	Nitrile	8 GAL/MIN, 30 L/MIN	Knob	5500 PSI, 380 BAR	100-1500 PSI, 6.9-103 BAR
RDH082S15	Quote Required	Quote Required	$68.75/each	380 bar	D-Ring (Standard)	ISO 4406 18/16/13, SAE Class 4	All parts steel. All operating parts hardened steel	45-2000 SSU (6 to 420 cSt)	0.18 kg	Direct Acting	Screw	1500 psi	380 bar	280 per turn psi	350 bar	Pressure Relief	Mineral-based or synthetic hydraulic fluids	+93 °C	C08-2	100-1500 psi	750 psi	5 @ 75% Crack Pressure drops/min	Screw in cartridge valve	Automatic	8 Gal/min	N/A	-37 to +93 °C	-37 °C	32-36 lb-ft	Hydraulic Systems Division	85% of pressure setting	30 L/min	Pressure Sensing	N/A	D-Ring (Standard)	8 GAL/MIN, 30 L/MIN	Screw	5500 PSI, 380 BAR	100-1500 PSI, 6.9-103 BAR