Phenomenon: after starting the pump, the pump pressure drops and the pump does not increase.
Main Reasons:
① Incomplete venting and air in the pump;
②The filter or oil inlet line is blocked (poor oil flow), and the primary impeller inlet is blocked;
③The oil temperature is too low or too high;
④The liquid level (pressure) of the large tank or buffer tank is too low;
⑤The balance device is seriously worn (the balance pipe is blocked or caused by improper operation);
⑥ The low-pressure end of the centrifugal pump is not tightly sealed, and the air is caused by the leakage.
Approach:
①Re-vent until the liquid naturally flows out from the vent valve at the output end;
② Clean the filter or check the diameter of the oil inlet line;
③ It is most suitable to control the oil delivery temperature between 450C and 500C;
④Check the liquid level and pressure of the large oil tank and buffer tank;
⑤ Check the balance device (can open the inspection if necessary);
⑥Check and replace the low pressure end seal of the centrifugal pump or adjust the cap screw.
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