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Constant pressure water supply training devices can meet the demand of constant pressure water supply,and keep the pressure at the ends (service pressure) in the water supply system pipeline network , the system can forecast setting pressure free,floe at the pumps high efficient area where the maximum lift and minimum lift. Through the pressure transmitter testing pipe pressure and translate into electrical signals sent to the controller, the controller compare,calculate and judge between pressure feedback signal and forecast setting pressure, to determine the operation frequency of frequency pump, one or more pump start-up and stop, so that the system can work normally and smoothly under various working conditions , in order to achieve the biggest energy saving effect.