Purpose:
The valve is used in the fire protection system of high-rise buildings. When the pressure of the water supply pipe exceeds the set pressure, the pressure relief valve is opened to prevent the pipeline and equipment from being damaged due to overpressure. When the pressure drops to the set value, the valve automatically closes.
Features:
The pressure in the water supply pipe that exceeds the safe setting value of the pilot valve can be released, and the pressure in the pipe can be maintained below the safe value to prevent the system danger caused by excessive water pressure.
Principle:
The inlet side of the main valve is connected to the pilot valve through the control pipe. When the inlet side pressure is greater than the set pressure of the pilot valve, the pilot valve opens to drain the pressure of the upper chamber, and the main valve disc opens. The main valve holds the pressure, and when the pressure is reduced to the set pressure, the pilot valve closes and the main valve also closes.