Impeller pumps are used mainly in grey water and black water transfer, engine cooling, baitwell and air conditioning along with other essential functions on boats, ships and other marine applications. Pump styles include both pedestal style or flange mounted. 

On initial startup, the impeller pumps must be primed to prevent dry-running of the impeller. Suction lifts of 15 feet are possible when the pump is fully primed. A foot valve with a built in strainer at the beginning of the suction line is recommended. Suction lines should be short as possible, while horizontal runs, if needed, should be pitched upwards towards the pump.

All pedestal and flange mounted impeller pumps are made of high quality bronze and offer maximum corrosion resistance. All shafts are constructed of grade 303 stainless steel.

Choose from low flow, medium flow or high flow flexible impeller pumps to fit your application.

How does an Impeller pump work?

Impeller pumps are positive-displacement pumps. The rotor with flexible vanes is mounted centered in a circular housing which has a compressed area at one side. Flexible blades on the periphery of the impeller provide pumping action. While the impeller rotates the liquid between the blades is continuously squeezed out into the discharge port by a cam located inside the pumping chamber. The flow may be throttled or shut off for a short period on the discharge side without the need for a relief valve.



Flexible Impeller flow example


The vanes on the impeller are compressed within the chamber allowing constant discharge through the outlet port of the pump.

Flexible Impeller flow example


The impeller rotates and moves the liquid from the suction side of the pump to the discharge side.

Flexible Impeller flow example


The rotation of the impeller while leaving the cam creates a vacuum type suction which draws the fluid into the pumps chamber.