The SHIELD alarm check valve Beatures a grooved seat alarm port, an external by-pass, and removable hand hole cover which hinged to a clapper assembly, it has both \anged inlet and outlet, the valve may be installed vertically on a wet pipe sprinkler system, which is used to lock water pressure \uctuations into the sprinkler system during providing the capability oB initiating the required [re alarm through a water motor alarm or an electric pressure switch, which may use at constant pressure or variable pressure water supplies. Wet Alarm Valves are designed to hold back water pressure in the piping system until the sprinkler is activated, to be used in wet pipe sprinkler installations in buildings not subject to Breezing temperatures. Alarm Valve includes trim packages valves, gauges, pressure switch, [ttings and nipples to provide retard chamber connection, drain connections and alarm test bybass. RETARD CHAMBER This is a valve accessory which may be used Bor variable pressure wet systems where mechanical motor alarms or pressure switches are used. In situations where excessive water pressure surges occur the retarding chamber is needed to collect excess water Brom the alarm valve and Beed water back into the main drain, beBore activating the alarm. Retard chamber with galvanized steel pipes and pipe [ttings Inlet Connection ½" NPT Bemale Outlet Connection ¾" NPT Bemale Rated Working Pressure  psig Hydrostatic Test Pressure 0 psig Material Aluminium Alloy WATER MOTOR ALARM GONG This is a hydraulically driven mechanical gong that automatically sounds a continuous alarm when the sprinkler system activates. Inlet Connection ½" NPT Bemale Outlet Connection ¾" NPT Bemale Rated Working Pressure  psig Hydrostatic Test Pressure 0 psig Material Aluminium Alloy