The wet alarm valve is designed for applications where the water is unlikely to freeze. The water staying pressurized in the pipes is released over the fire area after the sprinkler is activated due to fire.
When a sprinkler head pops under high temperature, pressure above the valve plate starts to drop, which causes the valve plate to open up, allowing water to flow through a previously covered slot port which is plumbed to a bottle called "retard chamber". The bottle would be filled up in about 30 seconds, and then water coming out from its top flows into a water motor gong (mechanical bell driven by a turbine) for local alarm and a pressure switch for remote alarm and sprinkler pump activation.
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This is great... but how does it work
When a sprinkler head pops under high temperature, pressure above the valve plate starts to drop, which causes the valve plate to open up, allowing water to flow through a previously covered slot port which is plumbed to a bottle called "retard chamber". The bottle would be filled up in about 30 seconds, and then water coming out from its top flows into a water motor gong (mechanical bell driven by a turbine) for local alarm and a pressure switch for remote alarm and sprinkler pump activation.
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