Why do stainless steel multi-stage pumps need to add water

With the increasingly important role of stainless steel multi-stage pumps in many fields, research on such products has also received more attention. Many users always have a question when using the product, why do stainless steel multi-stage pumps need to add water every time? Next, we will analyze the cause of this event.

The stainless steel multi-stage pump can store a portion of water and does not need to be refilled when restarted. As for the suction head, it should be related to the NPSH of each pump. The self priming process relies on a stainless steel multi-stage pump to press out the water in the stainless steel multi-stage pump and form a vacuum to suck the water into the pump. Therefore, except for pumps with impellers immersed in water, commonly used stainless steel multi-stage pump products must be filled with water before starting the pump, commonly known as a filling pump, Due to the large size of the pump body, the stainless steel multi-stage pump is equipped with a one-way valve at the inlet of the upper part of the pump body. It only needs to be filled with water for the stainless steel multi-stage pump before the first use, and it is not needed.

The methods for filling and diverting water with stainless steel multi-stage pumps are as follows:
The first method is to directly fill the inlet or outlet of the stainless steel multi-stage pump with water. At this time, it should be noted that the exhaust valve next to the outlet of the stainless steel multi-stage pump should be opened for exhaust; Another method is to pre extract the air inside the stainless steel multi-stage pump using a vacuum pump, and then start the stainless steel multi-stage pump after reaching a certain vacuum degree. In this case, the outlet pipeline valve needs to be closed.

In the water pump industry, "diversion" specifically refers to "guiding water". Because some pumps must manually add water before working to create a closed environment inside the pump, and the internal components of the pump move to create a local vacuum, in order to allow external water to be compressed into the pump inlet under atmospheric pressure under the pressure difference between inside and outside, completing the suction action. For example, in the past, the commonly used water pipes in rural areas had to be filled with water before the water from the well could be sucked up.
The height of suction head is related to the power, flow rate, structure, etc. of the pump, but it is limited by volume and power. Generally, the self suction head of a micro water pump is not easy to be high, because one atmospheric pressure can raise the water pressure up to 10.3 meters (because the pressure generated by one atmospheric pressure ≈ 10.3 meters of water column), so the maximum self suction head is only about 10.3 meters.

The use of stainless steel multi-stage pumps in many fields has facilitated people's work. It can effectively reduce labor intensity, improve work efficiency, and create great value. Its lightness and dexterity make it relatively convenient for installation and maintenance. After years of development, this type of product has already gained good market competitiveness, as well as good application market and development prospects. I believe that in the future, it will become the king of pump equipment.