Hale RSD - Manual (Page 16)

❑ Introduction
16 Section 2: Introduction
Hale Products, Inc., Nov. 2005, Rev-A
This contributes to improved performance with reduced maintenance. De-
creased maintenance is aided by centrifugal pumps having few moving
parts.
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
2-2: “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.
2.2 PUMP COMPONENTS
(See Figure 2-3: “Typical Pump and Gearbox Overview,” on page 17.)
The Hale single-stage pump consist of:
❑ Volute (Pump Body)
❑ Impeller and Clearance Ring
❑ Mechanical Seal
❑ Gearbox
Volute, Pump Body
(See Figure 2-3: “Typical Pump and Gearbox Overview,” on page 17.)
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 2-2: Pump Water Flow, Cutwater