Pump casing relief valve

Category Pressure relief valve

Certificate: UL Listed / FM Approved
Standard: UL 1478A, NFPA 13 / 20
Connection: Threaded NPT
Adjustment: 20 ~ 200 / 100 ~ 300 psi, etc.
Temperature: Max 82°C, water or air
W. pressure: 300 psi
Surface: Rough bronze

Product Details

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. The standard factory setting point is 50 psi for 0 ~ 75 range, 60 psi for 20 ~ 200 range, 100 psi for 100 ~ 300 range.

Available Size (Source 2 with FM)