The manual water filling method of centrifugal pump is mainly divided into automatic and manual water filling methods. The centrifugal pump (except the self-priming pump) should be filled with water before starting the pump and water inlet pipe, otherwise the pump will not be able to lift water. When a centrifugal pump is started, it does not produce water, which is often caused by the fact that the air in the pump is not completely discharged and the water is not fully filled. There are two main water filling methods before starting: one is to install a bottom valve for water filling, which is a one-way valve installed at the inlet of the water inlet pipe. The defect of this method is that the head of the bottom valve is lost greatly, which affects the efficiency of the pump; The other is water filling without bottom valve. The biggest advantage of this method is energy saving. The pump station with bottom valve can save 10%~15% energy. The following describes several filling methods of centrifugal pump for users to choose when running the pump. IMO agent

Self priming water filling method refers to the selection of a semi submerged pump house (that is, a pump station where the elevation of the water inlet pipe and the pump top are both below the water level of the intake pool), and the water can be introduced into the pump without manual irrigation. The defect of this kind of pump station is that the water absorption capacity of the pump is not fully utilized, and the installation elevation of the pump is reduced, which not only increases the excavation volume of the foundation, but also makes the operation and management more inconvenient; But the advantages are also obvious, that is, it is easy to realize the automation of the pump station, and the timeliness is strong.    ALLWEILER

Manual water filling method For small pump stations with inlet pipe diameter less than 300mm, the inlet of the inlet pipe is usually equipped with a bottom valve. Generally, the manual water filling method is used, that is, the water is filled from the special water filling exhaust hole on the upper part of the pump shell by a water filling funnel (or an inverted ordinary bottle with the bottom removed). For small pump stations with inlet pipe diameter less than 300mm, the inlet of the inlet pipe is usually equipped with a bottom valve, and the pump can also be filled with water from the outlet pipe orifice of the pump (pump station with shorter outlet pipe). Since there is no need to purchase other water filling equipment, this water filling method is widely used in small rural pump stations at present. IMO screw pump