In a water pump water pipe road system, when a sudden stop pump, pump discharge quickly close check valve, the Industrial Valves in the export pipeline circulation velocity suddenly drops, and generate reflux shock pressure, velocity mutation will impact pressure wave transmission, transmission speed is high, can make the valve outlet pressure to the number of times the rated pressure, this is the water hammer in pipeline, it can lead to Industrial Valves or a broken line, produce accident. In order to avoid this kind of accident, the people are using a delay shutoff valves, such as two phase control closing butterfly valve, hydraulic control valve has a dual valve plate, slow close check valve, etc. , to close the valve delay, part of the water through the pump and backflow of rotor in order to achieve the purpose of the pressure to eliminate water hammer pressure. But due to the pressure for a long time, the flow of water impact of pump impeller for a long time, make the pump reverse speed of rotor, a long time will damage the pump rotor parts and combined with the motor rotor parts. In order to solve the above problem, it is necessary to design a installed on the by-pass pipe automatic pressure relief Industrial Valves on the road, it can be drew back to pump in the pressure release time imports, namely pressure backflow through the pump rotor, no longer complete pressure can automatically shut down, thoroughly solved the problem of the impact pressure backflow pump reversal, and achieve the purpose of effectively eliminate water hammer.
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