SIHI Multistage Centrifugal Pump

The multi-stage pump is suitable for delivering low NPSH operating conditions. Basically, the front end of the suction end is a centrifugal impeller (1). This impeller is an induction impeller, which can provide sufficient pressure to overcome the inlet pressure loss of the first stage or required NPSH.

(1) Closed impeller (2) Fluid inlet front plate  (3) Fluid outlet rear shell (4) Radial impeller, between (2) and (3).

When the fluid enters from the inlet of the front plate (5), the fluid is sucked in due to the pressure (6) generated by the repeated movement of the fluid when it enters the radial impeller. The fluid enters the outlet of the rear shell and directly reaches the next stage (7). When the fluid produces centrifugal motion under the rotation of the radial impeller, the vortex effect of the fluid is caused, and the gas is concentrated to the root of the impeller due to the positive effect, allowing the gas to pass through the air groove.