Pump casing relief valve is a direct-acting, spring loaded, diaphragm type small relief valve used to relieve pressure build-up in a sprinkler system or in valve trim. The bottom plug can be removed and converted globe to angle type.
Available Size (Source 1 with UL/FM)
| Size | Adjustable pressure setting (psi) | Connection | Working Pressure (psi) | Ref.No. |
|---|---|---|---|---|
| 1/2″ / DN15 | 10 ~ 75 | NPT, F | 300 | U1501 (UL/FM) |
| 1/2″ / DN15 | 20 ~ 200 | NPT, F | 300 | U1502 (UL/FM) |
| 1/2″ / DN15 | 100 ~ 300 | NPT, F | 300 | U1503 (UL/FM) |
| 3/4″ / DN20 | 10 ~ 75 | NPT, F | 300 | U1504 (UL/FM) |
| 3/4″ / DN20 | 20 ~ 200 | NPT, F | 300 | U1505 (UL/FM) |
| 3/4″ / DN20 | 100 ~ 300 | NPT, F | 300 | U1506 (UL/FM) |
| 1″ / DN25 | 20 ~ 75 | NPT, F | 300 | U1507 (UL) |
| 1″ / DN25 | 40 ~ 200 | NPT, F | 300 | U1508 (UL) |
| 1″ / DN25 | 100 ~ 300 | NPT, F | 300 | U1509 (UL) |
Note:
1. For FM Approved, the adjustable pressure setting of 1/2″ and 3/4″ is 0 ~ 75 psi, 20 ~ 200 psi, 100 ~ 300 psi, 20 ~ 300 psi.
2. As factory preset, the relief pressure is set at 50 psi for 0 ~ 75 range, 60 psi for 20 ~ 200 range, 100 psi for 100 ~ 300 range.
Available Size (Source 2 with FM)
| Size | Adjustable pressure setting (psi) | Connection | Working Pressure (psi) | Ref.No. |
|---|---|---|---|---|
| 1/2″ / DN15 | 175 ~ 310 | NPT, M x F | 310 | U1511 (FM) |
Note: As factory preset, the relief pressure is set at 200 psi for 175 ~ 310 range.
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