Alarm Check Valve Working

E test and alarm trim with sprinkler alarm type.

Alarm check valve working. Close the alarm test valve and verify that water has ceased to flow from the alarm line drain. The bypass check valve reduces the possibility of false alarms by permitting slow as well as small transient increases in water supply pressure to be passed through. This trim is supplied with the sprinkler alarm bell which bells on actuation of the deluge valve. Meanwhile in the event of variable pressure condition false alarm is prevented with provision of retard chamber at the external bypass.

Alarm valve prevents a reverse flow of water or air pressure from the installation into the fire pump room. The wet alarm valve is designed for applications where the water is unlikely to freeze. Alarm check valve is core element in wet pipe fire sprinkler systems. Clean the 20 nb 3 4 strainer provided on the sprinkler alarm bell line.

The av 1 300 alarm check valve trim includes pressure gauges to monitor system pressure conditions a bypass check valve a main drain valve and an alarm test valve. Differential pressure dry pipe valve risers duration. An alarm check valve is basically a check valve with an alarm port. Applications for deluge valves.

It serves a dual purpose which prevents a reverse flow of water non return also provides for the use of the water motor gong. The water staying pressurized in the pipes is released over the fire area after the sprinkler is activated. Inspect the check valve clapper located on. In case a fire sprinkler is activated opened due to fire the alarm valve will open and permit water flow into the system and a pressure switch gives a signal to activate the fire pump.

Under normal circumstances the clapper of the valve is. Wet type alarm check valve working principal duration. Alarm bell and or the pressure alarm switch electric alarm properly actuate. Alarm valves are designed to initiate an alarm through water motor gong bell and or pressure switch during a sustained flow of water such as the flow required by an open sprinkler.

Hd alarm valves act as a check valves by trapping pressurized water above the clapper and preventing reverse flow from sprinkler piping. Clean the strainer of restriction assembly. 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.

Once the alarm check valves are activated they will allow water to flow through the system engaging the sprinkler system as and where needed in order to suppress a potential fire. A test valve is provided to test the normal operation of the sprinkler alarm bell. An alarm check valve can be activated or opened in one of two basic ways.