Use and Maintenance of Mixed Flow Pump

Posted by angroup on May 1, 2022

Model AHW pump is a horizontal single stage single suction volute mixed flow pump and suitable for transporting pure water or the other liquid with both physical and chemical natures similar to those of water, with the temperature of the liquid to be transported not over 50, for the farmland irrigation, industrial and city water supply and drainage, etc. multiple places.


Following is the use and maintenance of our AHW series mixed flow pump:


Take a trial of movement after the pump is installed to check its moving direction of it and remove the defect in the installation.

The sequence of trial:

Close the outlet gate valve or check the valve.

Fill leading water: first, start the pump and fill water into it through the screw hole on the top of it or open the check valve to let the water in the water-out pool back primed in or directly use a vacuum pump to lead water by means of exhausting (when the vacuum pump exhausts the air inside of the pump completely and gets water out, start the pump and stop the vacuum pump).

When the mover reaches the normal speed, open the gate valve fully and adjust the packing tightness. Have the pump go on moving in case of a normal movement and bearing temperature and a slight vibration (when the check valve is used, lift the bonnet when water goes out so as to reduce resistance).

Use and maintenance:

When the bearing uses thin oil for lubricating, often check and control the oil level with the bearing body in between two marking lines on the oil leveler rod; and when it uses dry oil (lubricating grease), supplement a proper amount of oil in a periodic time by means of removing both front and rear covers for model 150~350AHW pump and the oil cup for model 400~800AHW pump.

Often check the bearing's temperature rise, which should not be over the ambient one by 35 generally and by 75 to the utmost extent.

Pay attention to both frictional and collided sounds that may occur during the pump movement. In case of friction between both pump cover and impeller, add a paper pad in between both pump cover and casing. The applicable interval in the actual use is 0.3~0.7mm

Adjust the packing properly to have the liquid intermittently leak in drops from the packing gland. Too tight packing will cause the shaft to heat and the power increase while too loose will cause an excessive liquid leak and a lowered efficiency.

In the case of the direct link between both pump and motor, have the axial lines of both on the same straight line.

Check if there is the air that leaks from the water-in pipeline.

Pay attention to the power to see if it is suddenly enlarged or lowered and if the flow is suddenly reduced, stop the pump to troubleshoot if it is.

Often check if the bolts get loose due to vibration.

For any other help, please feel free to contact us.

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