About Pressure-Relief Valves
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Large-Diameter Remote-Discharge Fast-Acting
Pressure-Relief Valves for Air and Inert Gas
- For Use With: Air, Inert Gas
- Temperature Range: -20° to 406° F
Commonly used with high-volume blowers, compressors, and air-powered conveyors, these valves quickly relieve a large amount of air in systems with a pipe size of 2 or greater. They spring fully open at the set pressure and remain open until the system pressure is restored below the set pressure. Attach a drain line to the threaded relief port for remote discharge. Valves have a cast iron body to absorb vibration for reduced noise and wear in your pipeline.
For technical drawings and 3-D models, click on a part number.
Inlet | Relief Port | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size  | Location | Maximum Pressure, psi | Pipe Size | Location | Temperature Range, ° F | Overall Ht. | Test Mechanism | Valve Type | Choose a Set Pressure, psi | Each | |
NPT Male Inlet and NPT Female Relief Port | |||||||||||
Cast Iron Body—Bronze Seal | |||||||||||
| 3 | Bottom | 60 | 3 | Side | -20° to 406° | 9" | T-Handle | Pop Safety | 0000000 | 0000000 | |
Large-Diameter Remote-Discharge ASME-Code
Fast-Acting Pressure-Relief Valves for Air and Inert Gas
- For Use With: Air, Inert Gas
- Specifications Met: ASME BPVC.VIII
- Temperature Range: -20° to 406° F
These valves meet ASME Code Section VIII for use with air and inert gas pressure vessels. Commonly used with high-volume blowers, compressors, and air-powered conveyors, they quickly relieve a large amount of air in systems with a pipe size of 2 or greater. They spring fully open at the set pressure and remain open until the system pressure is restored below the set pressure. Attach a drain line to the threaded relief port for remote discharge. Valves have a cast iron body to absorb vibration for reduced noise and wear in your pipeline.
For technical drawings and 3-D models, click on a part number.
Inlet | Relief Port | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Location | Maximum Pressure, psi | Pipe Size | Location | Overall Ht. | Test Mechanism | Valve Type | Choose a Set Pressure, psi | Each | |
NPT Male Inlet and NPT Female Relief Port | ||||||||||
Cast Iron Body—Bronze Seal | ||||||||||
| 3 | Bottom | 60 | 3 | Side | 9" | T-Handle | Pop Safety | 0000000 | 0000000 | |
ASME-Code Fast-Acting Pressure-Relief Valves for Low-Pressure Steam
- For Use With: Steam
- Specifications Met: ASME BPVC.IV
- Max. Temperature: 250° F
For use with low-pressure steam-heating boilers requiring pressure relief at 15 psi, these valves meet ASME Code Section IV. All spring fully open at the set pressure and remain open until the system pressure is restored below the set pressure. Body is bronze for durability and a long service life.
Threaded relief ports can be attached to a drain line for remote discharge.
For technical drawings and 3-D models, click on a part number.
Inlet | Relief Port | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Connection | Location | Maximum Pressure, psi | Pipe Size | Connection | Location | Steam Flow Capacity, lbs./hr. | Set Pressure, psi | Overall Ht. | Test Mechanism | Valve Type | Each | |
Bronze Body—PTFE-Coated EPDM Seal | |||||||||||||
| 3 | NPT Male | Bottom | 15 | 3 | NPT Female | Side | 4,100 | 15 | 9 1/16" | Lever | Pop Safety | 000000 | 0000000 |
Precision-Adjustment Pressure-Relief Valves for Fuel
- For Use With: Diesel Fuel, Fuel Oil, Gasoline, Kerosene
- Temperature Range: -60° to 450° F
A finely threaded adjustment screw lets you make precise set pressure adjustments. These valves are for use with diesel fuel, fuel oil, gasoline, and kerosene. They begin opening at the set pressure and fully open at about 10% over the set pressure. Valves begin closing as pressure drops and fully close when the system pressure is restored below the set pressure. Adjust the set pressure within the range.
Valves with a bronze body are harder and more durable than valves with a brass body for a longer service life.
For technical drawings and 3-D models, click on a part number.
Inlet | Relief Port | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Location | Maximum Pressure, psi | Pipe Size | Location | Set Pressure Adjustment Method | Overall Ht. | Choose a Set Pressure Range, psi | Each | |
NPT Male Inlet and NPT Female Relief Port | |||||||||
Bronze Body and Seal | |||||||||
| 3 | Bottom | 300 | 3 | Side | External Adjustment Screw | 13 3/16" | 0000000 | 000000000 | |