High motor temperature
Thread Content
The motors of existing magnetic pump systems experience high temperatures during prolonged operation, which is harmful to the motors. In this situation, should the inlet valve or the outlet valve be closed down a bit?
The purpose is to reduce the load on the motor, thereby achieving a cooling effect
If the outlet valve is closed, the outlet pressure of the pump will increase – will this have any effects?
Closing the outlet valve will reduce the load, but it is necessary to maintain the pump’s minimum flow rate; otherwise the pump will be damaged
The inlet valve must remain fully open. The pump parameters are adjusted by controlling the outlet valve; reducing the outlet valve opening lowers the pump flow rate, and the pump power also decreases accordingly. However, the pump outlet pressure will increase. If the process parameters are not sensitive to pressure, to find out what the parameters will be after the adjustment, refer to the pump’s performance curve from its factory tests
The most vulnerable aspect of magnetic pump operation is pumping vacuum due to low flow rates, which can lead to operational failures such as loss of magnetism. Therefore, in principle, the inlet valve should be kept fully open. Moreover, valve adjustment should never be done by blocking the inlet valve, as this will result in negative consequences: it affects production stability and also incurs unnecessary costs in terms of equipment repair and labor!
I also know that the inlet of the pump should normally be fully open, but if it’s fully open, the current consumption is high; while if the outlet is closed partially, the pressure becomes too high