① The reverse rotation of the motor of the slurry pump causes the impeller to fall off or even break. This is a common situation. After the motor is reversed, the impeller will fall off, causing the slurry pump to be unable to rotate. In serious cases, the impeller and guard plate will be broken, causing great losses. It is clearly stipulated in the installation and use instructions: Before operating the slurry pump, the motor steering must be tested. If the steering is correct, insert the coupling pin and manually turn the pump without any problems, then the pump can be started.
② No circulating water is added or water is added improperly. For water-cooled mechanical seals, the circulating water must be turned on first and then the pump.
③When starting and stopping the machine, the improper sequence of opening and closing the valves causes problems. It is clearly stated in the instruction manual that the correct sequence for switching valves is as follows:
Starting sequence: Check the status of the inlet and outlet valves (closed) → open the clean water inlet valve → open the normal pressure cooling water valve (auxiliary impeller seal or mechanical seal) or shaft seal water valve (check the water pressure) → turn on the pump until stable operation → open the slag Slurry pump inlet valve → close the clean water inlet gate valve → open the outlet valve.
Shutdown sequence: open the inlet clean water valve → close the inlet pipeline valve (flush for 2 to 5 minutes) → close the outlet valve → stop the machine → close the shaft seal water or normal pressure cooling water → close the inlet clean water valve.
