4 Inch Wet Alarm Check Valve

When a fire breaks out in the protected area of the automatic sprinkler system and the ambient temperature of the fire scene rises, the glass ball on the closed nozzle bursts (or is easily fused and financialized), and the nozzle opens to spray water to extinguish the fire. At this time, due to the drop in water pressure of the pipe network on the outlet side of the wet alarm valve, a pressure difference is formed, the valve disc assembly is opened, and the water source water is continuously replenished to the pipe network to extinguish the fire. A certain water pressure impacts the hydraulic alarm bell and sends out a continuous alarm sound. The pressure switch acts to connect the electrical contacts and the control center to give an alarm with sound and light, and at the same time start the main water supply pump for fire extinguishing.