Features and application:
1. Purpose: This valve is used for high-rise building fire system. When the pressure exceeds the feed line in the set pressure relief, pressure relief valve is open, to prevent the pipeline and equipment damage due to overpressure; pressure down to the set value, the valve automatically closes.
2. Features: all-access streamlined body design, fluid resistance small, the flow rate. The valve can be pressure relief valve can also be holding valve, pressure relief valve may be in excess of water will set the value of the safety pilot valve pressure release, and maintain its security value under the pressure dry to prevent water Cause the system pressure is too high risk; do hold pressure valve to maintain the main valve when the upstream water pressure above a set value, dry, only the upstream pressure is higher than the set value, only the downstream water supply, to ensure the water supply pressure upstream of the main valve.
3. Principle: the inlet side of the main valve and pilot valve through the control pipe connected to the side when the import pressure is greater than the set pressure the pilot valve, pilot valve opens to vent the pressure chamber diaphragm off the main valve opens. The main valve pressure relief, pressure reduction to the set pressure, pilot valve closed, the main valve is also closed.