1. Mixed flow pump:
The pump at zero flow condition between the pump shaft power between these two, for the extra power of 100% ~ 130%, so mixed flow pump of engine characteristics should also be is between the two pumps, usually choose the pump motor and control valve to open slowly simultaneously.
Operating principle: operation principle and control of centrifugal pump zero flow characteristics, the same as the delay of the solenoid valve can be set up.
2. Stop the pump and its control:
1). The zero flow control of centrifugal pump pump stops (that is, first close the valve after the pump stops on centrifugal pump, first slowly closed control valve, although after stop the importance of pump is then medium flow inside the pipe by the additional flow rate gradually reduced to zero, velocity gradient minima, useful to avoid the reversal of the stop pump water hammer attacks and pump;
2). The shaft power of the pump is gradually reduced from the additional power to the minimum operating power, which is beneficial to the safety of the unit.
Operating characteristics of mixed flow pump
