Hale MG - Manual (Page 10)

Muscle Pumps
1-3
Single-Stage Pump
There are three series of single -stage pumps.
q Qpak – 500 GPM to 1000 GPM
(1,892 LPM to 3,785 LPM)
q Qflo - 750 GPM to 1,250 GPM
(2,838 LPM to 4,731 LPM)
q Qmax - 1,000 GPM to 2,250 GPM
(3,785 LPM to 8,516 LPM)
(See figure 1-2)
Hale single -stage pumps are of a size and design to
attach to the chassis rails of commercial and
custom chassis. The pump is driven from the
truck’s main driveline. Generally, the pump
consists of the following major components:
q Pump body
q Impeller and Shaft Components
q Gearbox
q Priming System
q Pressure Control Device
q Valves
Single-Stage Pump Operation
Hale single -stage pumps use a single impeller to
develop the required volume and pressure. Figure
1-3 shows the flow of water through the Hale
Qmax single -stage pump. Water enters the suction
channels on both sides of the impeller, thereby
maintaining axial balance. Dual cutwaters on the
Qmax strip water from the rotating impeller and
direct it to the discharge path. The Qflo and Qpak
pumps utilize an impeller with a single suction
channel where water enters. The impeller develops
discharge pressure and directs the water to a single
cutwater and then to the discharge valves. The
impellers are radially and axially balanced. Radial
hydraulic balance in the Qmax and Qtwo is
maintained by the opposed discharge volute
cutwaters. The cutwaters are wedge shaped and
divide the water between the volute and the pump
discharge.
Two-Stage Pump
There is one series of two-stage pump:
q Qtwo - 1,000 to 2,000 GPM
(3,785 LPM to 7,570 LPM)
(See figure 1-4)
Hale two-stage pumps are of a size and desig n to
mount on the chassis rails of commercial and
custom chassis. The pump is driven from the
truck’s main driveline. Generally, the pump
consists of the following major components:
q Pump Body
q Impeller and Shaft Components
q Gearbox
q Priming System
q Pressure Control Device
q Transfer Valve System
q Valves