Emergency shut down valve is developed in recent years, new products – closing valves, valve – mechanical industries
First, why use the emergency shutdown valve
You know, life has always been control of fire control network and two water supply systems, water supply consists of two pumps, respectively, from the pumping station into the building a long distance from Èr piped water supply. This workload due to the laying of pipeline construction Èr large double pipe materials, and maintenance to identify a pipeline has a lot of inconvenience; second, the fire channel year round use, easy to rust, because of the wall and interface corrosion thinning, usually do not have no pressure, but in the event of fire, a sudden pressure increase inside the tubes, easy to burst, causing the fire system can not supply. Third, the Shanghai advocate pump pumping directly from the municipal pipe network, no underground pool. This not only eliminates the need for pool construction cost, while avoiding secondary pollution of water sources. Maintaining clean water, to ensure people's health is the most important one. Because of the advantages of these areas, so the products are gradually being everyone's welcome.
Second, emergency shut down valve works
Emergency shutdown valve is a hydraulic Control Valve In one. By the main valve, throttle, pilot valve, pressure gauges and other fittings to take over the composition. When the main valve inlet pressure below the set pressure of pilot valve, pilot valve is turned on at this time, the main valve cover chamber pressure and the main valve outlet pressure equal to the import and export existing pressure, water flow through valve port export . When the fire pump start or variable frequency pump pressure increases, more than pilot valve set pressure, imported through the wizard from the main valve control valve control the pressure increased role Spring Pressure on the downward compression to drive the spool down, so that pilot valve closed, then the main valve inlet pressure by the throttle constantly added to the main valve cover chamber, due to disc by the downward pressure greater than the upward thrust, the main valve is closed. Please note that the relationship Key Point is less than the set pressure of the inlet pressure valve has been turned, inlet pressure is greater than the set pressure, the valve is turned off. There are many designers mistakenly think that if the emergency shutdown valve installed, it will pass, do not say what conditions, it was wrong.
Three problems in engineering
We encountered during the actual installation commissioning many unreasonable, to bring up for discussion. Yu Shan Road Shanghai Pudong is located in a residential area. Water supply network shown in Figure 2, the pump room on the ground floor of this residential area, three 12-storey and two eight-story floor, storey 2.8 meters, fire pump pump life are DN80, life pump head 53 meters, fire pump head 60 meters, flow 10L / S, water supply points W , DN80 tube into the rooftop water tank. By the pump at the same time for W DN80 DN80 pipes, so water pressure is not high, can barely enter the water tank. Emergency shutdown valve to the pressure set at 0.5MPa, while for W water pressure no more than 0.5MPa, can only supply water to the water tank. However, if there are four water tank is full, the tank's liquid level control valve closed, leaving only a tank of water still dissatisfied with pay, then the pressure will rise, more than 0.5MPa, emergency shut down valve is closed, the rest can not supply water of a water tank.
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