Precautions when using self-priming pump

The self-priming pump is a self-priming centrifugal pump, which has the advantages of compact structure, convenient operation, stable operation, easy maintenance, high efficiency, long life, and strong self-priming ability. There is no need to install a bottom valve in the pipeline, just make sure that the pump body has a fixed amount of priming before working. Different liquids can use self-priming pumps of different materials.

This article contains the following:

n  Preparation and inspection work before starting

n  Start up and operation

n  Stop the pump

Preparation and inspection work before starting

1. This series of diesel self priming pump are lubricated with high-quality calcium-based butter and No. 10 motor oil respectively according to the working conditions of the pump. If the grease-lubricated pump should be filled with grease into the bearing box regularly, the pump lubricated with oil If the oil level is insufficient, add enough.

2. Check whether the storage liquid in the pump casing is higher than the upper edge of the impeller. If it is insufficient, you can directly inject the storage fluid into the pump body from the filling port on the pump casing. You should not start the operation if the storage fluid is insufficient. Otherwise, it will not work properly, and it is easy to damage the mechanical seal.

3. Check whether the rotating parts of the pump are stuck or bumped.

4. Check if there is any looseness at the bottom of the pump body and at the joints.

5. Check the coaxiality and parallelism of the pump shaft and the motor shaft.

6. Check the inlet pipeline for leaks. If there is a leak, you must try to eliminate it.

7. Open the valve of the suction line, and slightly open (do not fully open) the outlet control valve.

Start up and operation

1. Jog the electric self priming pump, pay attention to the correct rotation of the pump shaft.

2. Pay attention to whether there is abnormal sound and vibration when turning.

3. Pay attention to the readings of the pressure gauge and vacuum gauge. After the start, when the readings of the pressure gauge and vacuum gauge fluctuate for a period of time and indicate stability, it indicates that the pump has been filled with liquid and enters the normal infusion operation.

4. During the self-priming process before the pump enters the normal infusion operation, special attention should be paid to the temperature rise of the pump. If this process is too long and the water temperature in the pump is too high, stop the pump and check the cause.

5. If the temperature of the liquid in the pump is too high to cause difficulty in self-priming, you can temporarily stop and use the liquid in the discharge line to flow back into the pump or add a liquid storage port to the pump body to directly add liquid to the pump to make the pump The liquid inside cools down, then start.

6. If strong vibration and noise occur in the pump during the work, it may be caused by the cavitation of the pump. There are two reasons for the cavitation: one is that the inlet pipe flow rate is too large, and the other is the suction stroke is too high. When the flow rate is too large, the outlet control valve can be adjusted to increase the reading of the pressure gauge. When the inlet pipe is blocked, it should be eliminated in time; when the suction stroke is too high, the installation height of the pump can be appropriately reduced.

7. When the pump is stopped for any reason during the working process, the outlet control valve should be opened slightly (not fully closed) when it needs to be restarted, which is not only conducive to the discharge of gas from the discharge port during self-priming, but also ensures that the pump is light Under load.

8. Pay attention to check the pipeline system for leakage.

Stop the pump

1. The gate valve on the discharge pipe must be closed first.

2. Stop the pump.

3. In the cold season, the storage liquid in the pump body and the water in the cooling chamber of the bearing body should be emptied to prevent freezing and cracking.

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