Alarm Check Valve Operation Animation

It serves a dual purpose which prevents a reverse flow of water non return also provides for the use of the water motor gong.

Alarm check valve operation animation. The wet alarm valve is designed for applications where the water is unlikely to freeze. Either manually when a person activates a water gong or electronically. An alarm check valve can be activated or opened in one of two basic ways. An alarm check valve is basically a check valve with an alarm port.

In the event of variable pressure condition false alarm. External bypass prevents false alarm under all supply pressure condition. The water staying pressurized in the pipes is released over the fire area after the sprinkler is activated. The main purpose of the alarm check valve is to ring a mechanical bell called a water motor gong.

The valve should if properly maintained help hold the system pressure steady and reduce the possibility of false alarms. An alarm valve prevents a reverse flow of water from the installation into the fire pump room but in case a fire sprinkler is activated opened due to fire the alarm valve will open and permit. Meanwhile in the event of variable pressure condition false alarm is prevented with provision of retard chamber at the external bypass.