Water motor gong, 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.