Option to purchase emergency shutdown valve valve Tiandun Hangzhou Tiandun emergency shutdown valves overview editor valve is used for domestic water supply system in the cell parallel fire water and water for life. When the fire water, automatic emergency shutdown valves, cut domestic water grocery fire water. When the fire ended, the valve opens automatically restore domestic water supply systems than traditional fire service more cost alone. Two works edited emergency shutdown valve is a hydraulic control valve. By other fittings of the main valve, throttle, pilot valve, pressure gauge and take over other components. When the main valve inlet pressure below the set pressure pilot valve, the pilot valve is 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 starting, or pump-pressure increases, over the pilot valve set pressure, valve control tube imported through the wizard increased pressure 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 constantly added to the main valve cover chamber, the downward pressure due to the valve being greater than the upward thrust, the main valve is closed. Please note that the key point is that the inlet pressure is less than the set pressure of the valve has been turned on, the inlet pressure is greater than the set pressure, the valve is closed. There are many designers mistakenly think that as long as the emergency shut-off valve installed, it will pass, do not say what the conditions, you're wrong. The valves are suitable for living quarters in the fire water and domestic water supply systems in parallel. When the fire water, automatic emergency shutdown valves, cutting off water to ensure the fire water life. When the fire ended, the valve opens automatically resume living water than traditional fire service more cost alone. Emergency shut-off valve must be installed before the filter, and should be easy sewage requirements. 3 Design Standard editor structural length of the standard: GB / T12221-2005 Flange standard: GB / T9113 pressure and temperature rating: GB / T12224-2005 test inspection standards: GB / T13927-2008