VIKING Deluge Valve Alarm Check Valve serves as a check valve by trapping pressurized water above the clapper and preventing reverse flow from sprinkler piping. The valve is designed to initiate an alarm during a sustained flow of water (such as the flow required by an open sprinkler) by operating an optional water motor alarm and/or alarm pressure switch. Specifications Types: Straight Through/Angle Style Material: Ductile Iron Rating: 250psi Sizes: 200NB, 150NB, 100NB, 80NB Approvals: