A multi-stage centrifugal pump ,a pump housing having an inlet and an outlet; and a plurality of pump stages within the pump housing, each pump stage comprising a diffuser, a channel ring, a biasing means for biasing the diffuser into contact with the channel ring and a rotatable impeller;Water Control valves each channel ring being a disk shaped member having a central opening therethrough, the outer periphery of the channel ring having a raised portion defining a first circular rim, the first circular rim having an inner diameter, the first circular rim having an axial thickness;Water Pump Control Valves each diffuser being a disk shaped member having a central opening therethrough, the outer diameter of the diffuser being smaller than the inner diameter of the channel ring first circular rim, the outer diameter of the diffuser being larger than the diameter of the channel ring central opening, the axial thickness of the diffuser being smaller than the axial thickness of the channel ring first circular rim, FORGED STEEL VALVESthe diffuser fitting with a non-interference fit within the first circular rim of the channel ring.

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2011-12-05

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