How to adjust a self-priming pump that frequently starts and stops

Category: Water pump knowledge

2025-08-18

Self-priming pumps, also known as miniature water pumps, are industrial water transport devices that use the principle of negative pressure to achieve waterless start-up. It extracts air through the vacuum effect of the pump body and then absorbs water, and is mainly used in agricultural irrigation, industrial cleaning and other scenarios. It has the advantages of self-priming, strong discharge capacity, and simple operation. However, in actual use, there are sometimes frequent problems of starting and stopping, which not only affects the normal operation of the equipment, but may also damage the equipment. This article will introduce several effective adjustment methods for this problem.

Adjustment methods for frequent start-stop of self-priming pumps:

I. Check faucets and pipes

First, check whether the faucet is turned off and whether there is water leakage in the pipeline. If the faucet is not tightened or the pipeline leaks, the outlet pressure will drop, triggering the automatic start of the self-priming pump. Therefore, ensuring that the faucet is tightly closed and checking the integrity of the pipeline is the first step in solving the frequent start and stop of the self-priming pump. During the inspection process, you can check the pipeline connections one by one to see if there are any signs of loosening or damage, and repair them in time.

II. Adjust the air pressure of the pressure tank

The pressure tank on the self-priming pump plays a role in stabilizing the voltage. If there is insufficient gas in the pressure tank, it may also cause the self-priming pump to start and stop frequently. In response to this situation, you can try to adjust the air pressure of the pressure tank. The specific method is to unscrew the gas filling nut on the pressure tank and use an air pump to add gas to it to ensure that the air pressure tank can play a voltage stabilizing effect. It should be noted that not every self-priming pump supports adding gas to the voltage stabilizing tank, so be sure to consult the self-priming pump's instruction manual or consult a professional before performing this operation.

III. Adjust the pressure controller

If the pumping distance is long or the height is high, the required pressure may be relatively large. In this case, if the pressure set on the pressure controller cannot meet the use requirements, the self-priming pump may also experience frequent start and stop problems. To solve this problem, you can try adjusting the set value of the pressure controller. The specific method is to first open the controller cover, and then use a flat-blade screwdriver to rotate the middle adjustment knob clockwise to obtain a higher disconnection pressure. Of course, when adjusting the pressure controller, it needs to be fine-tuned according to the actual situation to avoid damage to the equipment due to excessive or insufficient pressure.

IV. Install a check valve

When installing a self-priming pump, if a check valve is not installed at the inlet and outlet, it may cause a rapid return after the water is stopped, and the outlet pressure drops, triggering the self-priming pump to start again. To avoid this situation, it is recommended to install a check valve at the outlet of the self-priming pump. The function of the check valve is to prevent the liquid from returning quickly after the water is stopped, thereby maintaining the stability of the outlet pressure. When installing the check valve, make sure that it is tightly connected to the pipeline to avoid leakage or loosening.

V. Clean the inlet pipe and pump body

The problem of frequent start-stop of the self-priming pump may also be related to the blockage of the inlet pipe or the presence of air inside the pump body. Therefore, it is necessary to regularly check and clean the inlet pipe to ensure that it is unobstructed. You can disassemble the inlet pipe for cleaning, or use a high-pressure water gun for flushing. At the same time, it is also necessary to check whether there is air inside the pump body, and if necessary, exhaust air through the pump body exhaust hole, or install an air valve at the pump body inlet to remove air. Keeping the inlet pipe and pump body clean is the key to ensuring the normal operation of the equipment.

VI. Check the motor status

The motor is the power source of the self-priming pump. If the motor fails or runs unstable, it may also cause the self-priming pump to start and stop frequently. Therefore, it is necessary to regularly check the voltage, current, speed and other parameters of the motor to ensure that it is in normal working condition. You can use a multimeter and other testing tools to test the motor, and find and deal with potential problems in time. In addition, you should also pay attention to the heat dissipation of the motor to avoid overheating and damage to the motor.

VII. Check the impeller and bearings

In addition to the motor, the condition of the impeller and bearings will also affect the normal operation of the self-priming pump. If the impeller or bearings are worn or damaged, the pump body will not be able to work normally, which will cause frequent start and stop problems. Therefore, it is necessary to regularly check whether the impeller and bearings are normal. You can disassemble the pump body for inspection, or use sound and vibration detectors for detection. If wear or damage is found in the impeller or bearings, they need to be replaced or repaired in time to ensure the normal operation of the equipment.

In summary, the problem of frequent start-stop of self-priming pumps may be caused by a variety of reasons. In order to effectively solve this problem, it is necessary to investigate and adjust from multiple aspects. By checking faucets and pipes, adjusting the air pressure of the pressure tank, adjusting the pressure controller, installing a check valve, cleaning the inlet pipe and pump body, and checking the status of the motor and impeller bearings, we can effectively solve the problem of frequent start-stop of the self-priming pump and ensure the normal operation and stable performance of the equipment.

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