The reason why the self-priming pump needs to add water every time it is used
1. The Horizontal Self Priming Sewage Pump capacity of conventional self-priming pumps is generally low,
basically between 4-5 meters. Due to the poor self-priming capacity, the installation and use conditions are
also relatively strict.
2. Because the one-way valve installed in the outlet pipeline is too close to the pump, the outlet pipeline
other than the check valve is full of water after each stop of the pump, which causes the self-priming pump
to be unable to discharge air when it is started. Need to add water to suck up. The check valve should be
more than 1 meter vertically upward from the self-priming pump, which can help the self-priming pump
to discharge a small amount of air and water into the 1-meter empty pipe when the self-priming pump
is started for the second time. The one-way valve is too close to the pump. This will also cause the self-priming
pump to open the outlet check valve during the pumping process due to the outlet return pressure, so that
the air cannot be discharged. Therefore, the exhaust valve next to the outlet of the Horizontal Self Priming
Sewage Pump must be opened every time.
3. The inlet pipe of the Horizontal Self Priming Sewage Pump or the pump body, mechanical seal and
other components have water leakage and air leakage. Due to the current competition in the pump industry
compared with most manufacturers, the pump body model is reduced and the cost is reduced, resulting in a
price war. The water volume is reduced. Since the air is sucked into the pump body after the pump is stopped,
part of the water in the self-priming pump body is sucked back into the pool. As long as part of the water is
lost in the small pump body, the self-priming pump must be restarted every time it starts. Add water to suck up.
4. Since the outlet pipe of the Horizontal Self Priming Sewage Pump is not installed with a check valve
and the distance between the outlet pipes is short, after each shutdown, the pump body will form a certain
negative pressure after the self-priming pump discharges water. The action will generate a certain suction to
suck the air outside the outlet pipe into the pump cavity, and some of the water in the pump cavity will also
flow back into the pool. This is the reason why the self-priming pump needs to be refilled every time it is turned
on to be able to suck up.
If you are interested in the above Horizontal Self Priming Sewage Pump, please send your inquiry to us.
And to know more info about our Self-priming pump, please feel free to contact with us.
