Hale 80FC - Manual (Page 32)

❑ Introduction
32 Pump Ends
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As the impeller rotates, the
water moving outward in the
impeller creates reduced pres-
sure or a vacuum in the suc-
tion eye allowing atmospheric
pressure to push water into the
pump impeller, replacing the
water discharged. (See Figure
2-11: “Pump Water Flow, Cut-
water.”)
During operation water enters
the suction eye of the impeller.
The rotating impeller vanes
develop discharge pressure
and via the “cutwater *,” directs
the water to the discharge
opening.
* The “cutwater” is a wedge that
divides the water between the volute
(pump body) and the pump discharge.
2.4 PUMP COMPONENTS
(See Figure 2-12: “Typical Pump and Gearbox Overview,” on page 33.)
The Hale single-stage pump consist of:
❑ Volute (Pump Body)
❑ Impeller and Clearance Ring
❑ Mechanical Seal
❑ Gearbox / Pedestal Option
Volute, Pump Body
(See Figure 2-12: “Typical Pump and Gearbox Overview,” on page 33.)
As water discharges from the impeller, it enters the volute (pump body).
The volute is constructed from fine-grain cast iron and shaped so that its
area increases from the cutwater to its full capacity at the volute throat.
Figure 2-11: Pump Water Flow, Cutwater