Self Priming Centrifugal Pump Sewage Pump

Sewage self priming centrifugal pump

Model: 50ZW20-35

Inlet size: DN50(mm)                            

Flow: 20m3/h

Head: 30m

Power: 5.5kw

Speed: 2900rpm

Efficiency: 48%

Voltage/frequency: 380v/50hz/3phases

Pump casting: HT200

Impeller:   HT200

Shaft:   45# steel

This pump consists of pump casing, impeller, rear cover,

mechanical seal, shaft, bearing seat, inlet valve, air-liquid separating

pipe, water filling valve, inlet and drain- out nipples etc. 

A liquid storing cavity is set inside of the pump casingand connected to the working cavity through the back-flow hole on the upper and the cycling hole on the lower to form the axial-back flow outside mixing type system of the pump.

Liquid of a certain volume has been stored in the storing cavity after the pump stops working and, under the action of the impeller when the pump starts, is thrown out upwards with air and then flows back to the working cavity through the grids of the air-liquid separating pipe, the air is exhausted out of the pump to have a certain vacuum formed inside of the pump so as to get the self-suction action.