Constant speed arc pump on the speed range In practice, the water supply system is often more than arc pump parallel water supply. Due to the expensive investment, it is impossible to speed up all the pumps, so the general speed pump, fixed speed pump mixed water supply. In such a system, care should be taken to ensure that both the variable speed pump and the fixed speed pump operate at the high efficiency stage and achieve the optimum system. At this point, constant speed arc pump on the parallel operation of the governor pump speed has a greater impact. The main points of the following two situations: 1, the same type of arc pump must be run side by side, although the scheduling flexibility, but can not take into account the speed pump and constant speed pump efficient work section, so speed operation in this case The range is very small. 2, different models of a pump must be run side by side, if it can reach the speed of the pump at the rated speed of the right end of the high end of the head and the high-speed section of the pump head is equal. You can achieve the maximum range of speed operation. However, at this moment, the speed regulating pump and the constant speed pump must not be allowed to run in parallel after the exchange.