Water motor gong (Water motor alarm), also known as sprinkler alarm or water motor alarm, is a hydromechanical automatic sound warning device actuated by water flow. It is usually conjunct with alarm check valve, dry pipe valve, or deluge valve to sound a local alarm.
While sprinkler system operates, water passes through the water motor gong, the impeller turns and the shaft rotates by high velocity water jet, and the rotating shaft drives a striker assembly which rings the gong, sounding a continuous alarm.
Main parts and feature
| Wall for mounting (mm) | Inlet | Drain outlet | Working pressure (psi) | Ref. No. |
|---|---|---|---|---|
| 50 – 450 | 3/4″, NPT or BSPT | 1″, NPT or BSPT | 7-300 | V9101 (UL) |
| 50 – 450 | 3/4″, NPT or BSPT | 1″, NPT or BSPT | 7-300 | V9102 (UL) |
| 50 – 450 | 3/4″, NPT or BSPT | 1″, NPT or BSPT | 7-300 | V9103 (UL/FM) |
Note: It includes standard trim components, including Y strainer, galvanized steel nipples and cast iron pipe fittings.
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