Fire Alarm Check Valve
Alarm Check Valves are divided seat ring, rubber faced clapper, check type water-flow alarm valves which are intended for use in wet pipe (automatic sprinkler) fire protection systems. They are designed to automatically actuate electrically and/or hydraulically operated alarms when there is a steady flow of water into the system which is equivalent to the discharge rate of one or more sprinklers.
Features
Unilateral piping, easy to operate
85dB water motor gong, beautiful shape
1.7L chamber, to prevent false alarm
Rating working pressure 1.6MPa
Alarm check valve get the FM Approval
The size can be 4",6",8" with NFPA standard flange connection.
Accessories include pressure gauge, pressure switch, trims and water motor gong.
Accessories
1.Delayer
When ZSFZ alarm check valve is installed on a system with variable pressure water supplying, then it need be equipped with delayer to decrease the possibility of mistake alarm.
2. Water motor alarm
After the ZSFZ alarm check valve starting, the valve disc uplifts from its valve seat, and during continuous water supply process, the water flow passes through the delayer and conducts the delaying operation, then the water powered alarm will start to alarm.
3.Pressure switch
ZSFZ alarm check valve can be equipped with pressure switch which can alarm in the continuous water supply process by feedbacking electrical signal to the on-site fire control panel.
| Size | 4"(DN100) | 6"(DN150) | 8"(DN200) |
| Inlet Connection | Flange | Flange | Flange |
| Outlet Connection | Flange | Flange | Flange |
| Max.Working Pressure | 232psi/16bar | ||
| Material(Body) | Ductile Iron | ||
| Factory Hydro Test | 100%@464psi/32bar | ||
| Standard Finish | Red painted | ||
| Flange Specification | Flange:Class 150 ANSI B16.10 & ISO | ||
| Required Accessories | Standard Trim | ||
| Optional Accessories | Retard Chamber,Water Motor Alarm,Pressure Switch | ||
| Installation Manner | Vertically | ||
| Listings and Approvals | FM | ||
Operation
When the fire fighting system starts increasing pressure, water will flow into the system until reaching a balance between the water supplying with the system pressure. And the alarm check valve can put pressure on the fire pumps valve to prevent the water backflowing. Once the pressure comes to balance, the alarm check valve will be in operation state, and the middle chamber of its seat ring will be sealed. So if the alarm check valve was set at maintenance state, there will no alarm port to the alarm facility (alarm pressure switch).
