Lockable pressure relief valve is used to relieve excess system pressure caused by surges or temperature changes in wet sprinkler systems and downstream of pressure reducing valve.
Available size
| Size | Relief pressure range (psi) | Working pressure (psi) | Ref. No. |
|---|---|---|---|
| 1/2″ / DN15 | 175 ~ 300 | 300 | VC3901 (UL/FM) |
| 3/4″ / DN20 | 175 ~ 300 | 300 | VC3902 (UL/FM) |
Note:
1. For 1/2″, UL listed relief pressure setting is 175 ~ 220 psi, 225 ~ 295 psi and 300 psi; FM approved relief pressure setting is 175 ~ 300 psi.
2. For 3/4″, UL listed relief pressure setting is 175 ~ 220 psi; FM approved relief pressure setting is 175 ~ 300 psi.
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