900X emergency shut-off valve

Emergency shut-off valve (900X) consists of other fittings main valve, needle, pilot valve, pressure gauge and take over a fire water and life in parallel for water supply systems, water supply for the deployment direction of the valve. When a fire occurs, the fire needed a lot of water, 900X emergency shut-off valve immediately cut off the domestic water, to ensure adequate fire water: when the fire stopped the water pressure is reduced. The valve automatically opens, it was always open, to restore domestic water supply. The valve makes the system without a separate dedicated fire alone water supply network, greatly save construction costs and water consumption. Valve control of high sensitivity, safe, easy to debug, long service life. Emergency shut-off valve (900X) How it works: When the main valve outlet pressure is below the set pressure the pilot valve, the pilot valve in the open state at this time, the main valve cover chamber pressure and the main valve outlet pressure equal to the import and export existing differential pressure, flow through the valve port by exports. When the fire pump start, or pump - pressure has increased beyond the pilot valve set pressure, valve control imports through the guide pipe pressure increases from the main valve, acting on the spring pressure, pressed down to drive spool down, so that the pilot valve is closed, this time the main valve inlet pressure through the throttle valve continuously added to the main valve cover chamber, due to valve flap downward pressure is greater than the upward thrust, the main valve closed.