One question per day: Methanol and purification technology forum version, 20180812
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Short answer: Reasons for the pump motor to reverse direction. 1. The motor rotating in the reverse direction at startup is due to reversed wiring of the motor. 2. If the motor rotates in the reverse direction after the pump is stopped, it indicates that the inlet and outlet valves of the pump are open, and the check valve at the pump’s outlet has such high leakage that it is no longer effective. The fluid pathways are connected.
1. The motor rotating in the reverse direction at startup is due to reversed wiring of the motor. 2. If the motor rotates in the reverse direction after the pump is stopped, it indicates that the inlet and outlet valves of the pump are open, and the check valve at the pump’s outlet has such high leakage that it is no longer effective. The fluid pathways are connected.