Automatic air release valve is used in wet pipe sprinkler systems and on casing of horizontal split case pump, so to automatically release small pockets of accumulated air while the system operates under pressure exceeding atmospheric pressure.
Available size (Source 1 with UL/FM)
| Inlet | Outlet | Orifice | Working pressure (psi) | Ref.No. |
|---|---|---|---|---|
| 1/2″ NPT | 1/2″ NPT | 1/16″ | 300 | U3701 (UL/FM) |
| 3/4″ NPT | 1/2″ NPT | 1/16″ | 300 | U3702 (UL/FM) |
| 1″ NPT | 1/2″ NPT | 1/16″ | 300 | U3703 (UL/FM) |
Available size (Source 2 with UL/FM)
| Inlet | Outlet | Orifice | Working pressure (psi) | Ref.No. |
|---|---|---|---|---|
| 1/2″ NPT | 1/2″ NPT | 1/16″ | 300 | U3711 (UL/FM) |
| 1/2″ NPT | 1/2″ NPT | 3/32″ | 300 | U3712 (UL/FM) |
| 3/4″ NPT | 1/2″ NPT | 1/16″ | 300 | U3713 (UL/FM) |
| 3/4″ NPT | 1/2″ NPT | 3/32″ | 300 | U3714 (UL/FM) |
| 1″ NPT | 1/2″ NPT | 1/16″ | 300 | U3715 (UL/FM) |
| 1″ NPT | 1/2″ NPT | 3/32″ | 300 | U3716 (UL/FM) |
Available size (Source 2 with ISO)
| Inlet | Connection | Orifice | Working pressure (psi) | Ref.No. |
|---|---|---|---|---|
| 2″ / DN50 | FLG | / | 250 | U3717 (ISO) |
| 2-1/2″ / DN65 | FLG | / | 250 | U3718 (ISO) |
| 3″ / DN80 | FLG | / | 250 | U3719 (ISO) |
| 4″ / DN100 | FLG | / | 250 | U3720 (ISO) |
| 6″ / DN150 | FLG | / | 250 | U3721 (ISO) |
| 8″ / DN200 | FLG | / | 250 | U3722 (ISO) |
Available size (Source 3 with FM)
| Inlet | Outlet | Orifice | Working pressure (psi) | Ref.No. |
|---|---|---|---|---|
| 1/2″ NPT / BSPT / BSPP | 1/2″ NPT | 1/16″ | 200 | U3731 (FM) |
| 3/4″ NPT / BSPT / BSPP | 1/2″ NPT | 1/16″ | 200 | U3732 (FM) |
| 1″ NPT / BSPT / BSPP | 1/2″ NPT | 1/16″ | 200 | U3733 (FM) |
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