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About Pressure-Relief Valves
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Compact Pressure-Relief Valves
Due to their small size, these valves are often installed on tanks in low-clearance areas. They begin opening at the set pressure. Nylon valves fully open at about 10% over the set pressure and steel valves fully open at about 50% over the set pressure. Valves begin closing as pressure drops and fully close when the system pressure is restored below the set pressure. All have a vent outlet to exhaust discharge directly. Set pressure is not adjustable.
Steel Body—For Grease and Oil
- For Use With: Grease, Oil
- Temperature Range: Not Rated
Inlet | Each | |||||||
|---|---|---|---|---|---|---|---|---|
| Pipe Size  | Location | Maximum Pressure, psi | Relief Port Location | Overall Ht. | Set Pressure, psi | 1-9 | 10-Up | |
NPTF Male Inlet and Relief Vent | ||||||||
| 1/8 | Bottom | 5 | Top | 1/2" | 1 | 000000 | 00000 | 00000 |
| 1/8 | Bottom | 15 | Top | 1/2" | 7.5 | 000000 | 0000 | 0000 |
| 1/8 | Bottom | 25 | Top | 1/2" | 15 | 000000 | 0000 | 0000 |
| 1/8 | Bottom | 80 | Top | 17/32" | 45 | 000000 | 0000 | 0000 |
| 1/8 | Bottom | 140 | Top | 9/16" | 80 | 0000000 | 0000 | 0000 |
| 1/8 | Bottom | 200 | Top | 1/2" | 100 | 0000000 | 0000 | 0000 |
| 1/8 | Bottom | 650 | Top | 1/2" | 400 | 0000000 | 0000 | 0000 |
BSPT Male Inlet and Relief Vent | ||||||||
| 1/8 | Bottom | 1 | Top | 1/2" | 0.3 | 0000000 | 0000 | 0000 |
| 1/8 | Bottom | 5 | Top | 1/2" | 1 | 0000000 | 0000 | 0000 |
| 1/8 | Bottom | 80 | Top | 1/2" | 45 | 0000000 | 0000 | 0000 |