Vertical multi-stage pump is a common type of water pump, which consists of multiple levels of impellers and stators, each of which can increase a certain pressure. If the pressure cannot be relieved during use, it may affect its work efficiency and service life. Here are some reasons that may cause stress to persist.

Damage or blockage of impeller:

The distance between the impeller and stator of a vertical multi-stage pump is very small. Therefore, any foreign objects or wear on the surface of the impeller can cause a decrease in pump performance, and even prevent pressure from increasing. If damage or blockage is found on the surface of the impeller, it should be cleaned or replaced immediately.

Pump body leakage:

If there is a leakage in the pump body, the working pressure of the pump will definitely decrease. The cause of pump body leakage may be aging or damage to the seals, or damage to the pump body. It is necessary to check whether the seals of the pump body are intact and replace damaged seals or pump bodies in a timely manner.

Water inlet pipeline or valve issues:

The problem with the inlet pipeline or valve may also cause the pressure of the vertical multi-stage pump to not increase. The blockage, obstruction or damage of the inlet pipeline or valve can affect the inlet of the pump, thereby affecting the working pressure of the pump. It is necessary to check whether there are any problems with the inlet pipeline or valve, and promptly carry out maintenance or replacement.

Pump speed too low or too high:

Too low or too high a speed may also cause the pressure to fail to rise. When the speed is too low, the output flow of the pump will decrease, resulting in a decrease in pressure. Excessive rotational speed can cause damage to the impeller and stator of the pump, leading to a decrease in pump performance. Therefore, it is necessary to ensure that the pump speed is within a reasonable range and adjust the speed in a timely manner to ensure the normal operation of the pump.

The inlet pressure of the pump is too low:

Low import pressure can also cause the pump's pressure to not rise. Under normal working conditions, the inlet pressure of the pump should be maintained within a certain range. If the inlet pressure is too low, methods such as increasing the diameter of the inlet pipeline, replacing the inlet valve, or increasing the length of the inlet pipeline can be considered to increase the inlet pressure.

In summary, there are many reasons why the pressure of a vertical multi-stage pump cannot be increased, which may be due to damage or blockage of the impeller, leakage of the pump body, problems with the inlet pipeline or valve, low or high pump speed, low inlet pressure of the pump, etc. When using, it is necessary to carefully check the various parameters of the pump, promptly identify problems, and perform maintenance or replacement to ensure the normal operation and service life of the pump.