The Reliable Alarm Valve Model E3 activates the water flow alarm device in wet pipe sprinkler systems. The design allows for installation under both variable and constant supply conditions. When water flows in the sprinkler system due to the operation of one or more automatic fire sprinklers, the alarm valve opens, allowing continuous flow of water into the system and transmittal of water pressure to electrical and/or mechanical water flow alarm devices. See Technical Data Sheet or Installation, Operation & Maintenance Manual for further details.