Fountain pump check valve role

Fountain pump check valve role
First, to prevent back flow
If the check valve is not used or the check valve is faulty, the water in the riser of the well will return when the pump stops. This return will reverse the rotor, while in the submersible motor thrust bearing to maintain a small thrust until the rotor stops rotating, which will lead to motor thrust bearing too much wear and reduce motor life.
Second, to prevent the thrust generated
If you do not use a one-way valve or one-way valve leak, no water head for each pump start. Many pumps in the case of low-pressure head to make every effort to push up the impeller will pull up the rotor. Repeating this push-up force can cause the pump motor to malfunction unless the pump is configured to prevent the shaft from moving.
Third, to prevent the production of water hammer
If the check valve is not used, a water hammer may be formed by the gravity of the water column when the pump is stopped. This water hammer will break through the pipeline pipe, destroy the impeller, the motor and water pump thrust bearing damage.