About Pressure-Relief Valves
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Made-to-Order Pressure-Relief Valves
Design a valve specifically for your process media and set pressure. Choose from a valve for air, inert gas, water, hydraulic oil, fuel oil, gasoline, or diesel fuel and a set pressure. These valves begin opening at the set pressure and fully open at about 10% over the set pressure. They begin closing as pressure drops and fully close when the system pressure is restored below the set pressure. Body is 316 stainless steel for exceptional corrosion resistance.
To Order: Please specify medium and a set pressure in 1 psi increments from the range listed in the table.
Inlet | Relief Port | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size  | Location | Maximum Pressure, psi | Pipe Size | Location | Temperature Range, °F | Overall Ht. | Set Pressure Range, psi | Medium | Each | |
NPT Female Inlet and NPT Female Relief Port | ||||||||||
316 Stainless Steel Body—Fluoroelastomer Seal | ||||||||||
| 1/2 | Bottom | 3,300 | 3/4 | Side | -10° to 400° | 7 1/2" | 150 to 2,699 | Hydraulic Oil | 0000000 | 0000000 |
NPT Male Inlet and NPT Female Relief Port | ||||||||||
316 Stainless Steel Body—Fluoroelastomer Seal | ||||||||||
| 3/4 | Bottom | 3,300 | 3/4 | Side | -10° to 400° | 7 1/2" | 150 to 2,269 | Hydraulic Oil | 0000000 | 000000 |
| 1 | Bottom | 3,300 | 1 | Side | -10° to 400° | 7 1/2" | 150 to 2,421 | Hydraulic Oil | 0000000 | 00000000 |
Pressure-Regulating Inline Hydraulic Valves
When input pressure varies, use these valves to maintain a consistent pressure. They are often placed after a directional-control valve and before an actuator, such as a cylinder. They have an indicator/gauge port for the inlet and one for the outlet so you can monitor that output pressure remains steady.
For technical drawings and 3-D models, click on a part number.
Inlet/Outlet Connection | Relief Connection | O'all | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Dash Size | Pipe Size | Dash Size | Lg. | Wd. | Ht. | Choose a Set Pressure Range, psi | Each | |
NPT Female Inlet and Relief Port | |||||||||
Cast Iron Body | |||||||||
| 3/4 | 12 | 1/4 | 04 | 5 7/8" | 3 3/4" | 7 1/8" | 000000 | 0000000 | |
Pressure-Relief Hydraulic Valves
To set the pressure, unscrew the cap and turn the adjustment screw. Valves begin opening at the set pressure and fully open at about 10% over the set pressure. They begin closing as pressure drops and close when the system pressure is restored below the set pressure.
Iron valves absorb vibration to reduce noise and wear in the pipeline. 316 stainless steel valves are more corrosion resistant than iron valves.
For technical drawings and 3-D models, click on a part number.
Inlet Connection | Relief Connection | O'all | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Dash Size | Pipe Size | Dash Size | Lg. | Wd. | Ht. | Temp. Range, °F | Choose a Set Pressure Range, psi | Each | |
NPT Female Inlet and NPT Female Relief Port | ||||||||||
Iron Body | ||||||||||
| 3/8 | 06 | 3/8 | 06 | 2 1/16" | 1 3/8" | 5 3/8" | -20° to 400° | 0000000 | 0000000 | |
| 1/2 | 08 | 1/2 | 08 | 2 3/16" | 1 7/16" | 6 3/16" | -20° to 400° | 0000000 | 000000 | |
| 3/4 | 12 | 3/4 | 12 | 2 11/16" | 1 11/16" | 6 15/16" | -20° to 400° | 0000000 | 000000 | |
| 1 | 16 | 1 | 16 | 3 5/16" | 2 1/16" | 8 1/4" | -20° to 400° | 0000000 | 000000 | |
| 1 1/4 | 20 | 1 1/4 | 20 | 3 13/16" | 2 1/2" | 9 9/16" | -20° to 400° | 0000000 | 000000 | |
| 1 1/2 | 24 | 1 1/2 | 24 | 4 1/8" | 2 7/8" | 11 1/16" | -20° to 400° | 0000000 | 000000 | |
| 2 | 32 | 2 | 32 | 4 5/8" | 3 1/4" | 13" | -20° to 400° | 0000000 | 000000 | |
NPT Male Inlet and NPT Female Relief Port | ||||||||||
316 Stainless Steel Body | ||||||||||
| 1/2 | 08 | 1/2 | 08 | 1 5/8" | 1 1/8" | 4 3/16" | 40° to 250° | 0000000 | 000000 | |
Easy-Adjust Pressure-Relief Hydraulic Valves
An external nut lets you adjust the pressure without disassembling the valve. These valves begin opening at the set pressure and fully open at about 10% over the set pressure. They begin closing as pressure drops and fully close when the system pressure is restored below the set pressure.
Brass valves have good corrosion resistance. 303 stainless steel valves are more corrosion resistant than brass valves.
For technical drawings and 3-D models, click on a part number.
Inlet Connection | Relief Connection | O'all | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Dash Size | Pipe Size | Dash Size | Lg. | Wd. | Ht. | Temp. Range, °F | Choose a Set Pressure Range, psi | Each | |
NPT Female Inlet and Relief Port | ||||||||||
Brass Body | ||||||||||
| 1/4 | 04 | 1/4 | 04 | 1 11/16" | 1 1/4" | 3 11/16" | -40° to 250° | 0000000 | 0000000 | |
| 1/2 | 08 | 1/2 | 08 | 2 3/8" | 1 3/4" | 5 7/8" | -40° to 250° | 0000000 | 000000 | |
| 3/4 | 12 | 3/4 | 12 | 2 7/16" | 1 3/4" | 5 15/16" | -40° to 250° | 0000000 | 000000 | |
303 Stainless Steel Body | ||||||||||
| 1/2 | 08 | 1/2 | 08 | 2 3/8" | 1 3/4" | 5 7/8" | -40° to 250° | 0000000 | 00000000 | |
| 3/4 | 12 | 3/4 | 12 | 2 7/16" | 1 3/4" | 5 15/16" | -40° to 250° | 0000000 | 00000000 | |
Tamper-Resistant Pressure-Relief Hydraulic Valves
The pressure setting on these valves cannot be adjusted while they are installed. Use a hex key to unlock the locknut and turn the adjustment screw to set the pressure. Valves begin opening at the set pressure and fully open at about 10% over the set pressure. They begin closing as pressure drops and fully close when the system pressure is restored below the set pressure.
For technical drawings and 3-D models, click on a part number.
Inlet Connection | Relief Connection | O'all | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Dash Size | Pipe Size | Dash Size | Wd. | Ht. | Temp. Range, °F | Choose a Set Pressure Range, psi | Each | |
NPT Female Inlet and Relief Port | |||||||||
Aluminum Body | |||||||||
| 1/2 | 08 | 1/2 | 08 | 1 1/4" | 5" | -40° to 250° | 0000000 | 0000000 | |
Pressure-Relief Screw-In Hydraulic Valves
Set a specific pressure and these valves will maintain it. Also known as cartridge valves, these compact valves screw into your mounting block. They begin opening at the set pressure and fully open at about 20% over the set pressure. They begin closing as pressure drops and fully close when the system pressure is restored below the set pressure.
For technical drawings and 3-D models, click on a part number.
Body—UN/UNF (SAE Straight) | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Deltrol Equivalent Model No. | Hydraforce Equivalent Model No. | Thread Size | Dash Size | Max. Flow Rate, gpm | Max. Pressure, psi | O'all Ht. | Set Pressure Range, psi | Each | |
Anodized Aluminum Body | |||||||||
| DRV2-080-N-K-4 | __ | 3/4"-16 | 08 | 10 | 3,000 | 4" | 100-400 | 0000000 | 000000 |
| DRV2-080-N-K-20 | __ | 3/4"-16 | 08 | 10 | 3,000 | 4" | 300-2,000 | 0000000 | 00000 |
| DRV2-080-N-K-30 | __ | 3/4"-16 | 08 | 10 | 3,000 | 4" | 1,500-3,000 | 0000000 | 00000 |
| DRV-100-N-K-4 | RV10-20A-0-N | 7/8"-14 | 10 | 10 | 3,000 | 4 1/2" | 100-400 | 0000000 | 00000 |
| DRV-100-N-K-20 | RV10-20A-0-N | 7/8"-14 | 10 | 10 | 3,000 | 4 1/2" | 300-2,000 | 0000000 | 00000 |
| DRV-100-N-K-30 | RV10-20A-0-N | 7/8"-14 | 10 | 10 | 3,000 | 4 1/2" | 1,500-3,000 | 0000000 | 00000 |
Pressure-Regulating Block-Mount Hydraulic Valves
This valve maintains a consistent pressure in a system when input pressure varies. It is often placed after a directional-control valve and before an actuator, such as a cylinder. Use screws to attach to an NFPA valve-mounting block (each component sold separately).
For technical drawings and 3-D models, click on a part number.
Pressure-Relief Block-Mount Hydraulic Valves
Set a specific pressure and this valve will maintain it by diverting excess fluid from a pump to a tank. Valve opens at set pressure and closes when pressure drops. Use screws to attach to an NFPA valve-mounting block (each component sold separately).
For technical drawings and 3-D models, click on a part number.