Hale Q Series Muscle - Manual (Page 26)

 Introduction
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Note: When shifting the transfer valve from volume to pressure, pressure (PSI / kPa) is dou-
bled. You may hear a metallic click indicating as the check valve closes. If the clicking is too
loud or somewhat violent, the pumping pressure is too HIGH for switching. Ease back on the
engine throttle to reduce IDLE speed.
2.3 MUSCLE PUMP COMPONENTS
Hale muscle pumps are manifolded-type pumps. The pump volute, suction manifold-
ing, and discharge manifolding are cast as one piece to simplify installation. (See Fig-
ure 2-7: “Typical Midship Two-Stage Centrifugal Pump” on page 27.)
Pump Body
The standard pump body and related parts are constructed from fine grain alloy cast iron,
with a minimum tensile strength of 30,000 PSI (207 N/mm²). All moving parts subject to
water contact.
A bronze body, for use with saltwater or harsh water applications, is also available.
Qmax, Qmid, and Qtwo Pumps
The Qmax, Qmid, and Qtwo pump body is split horizontally on a single plane in two
sections for easy removal of the impeller assembly, including clearance rings and
bearings.
The impeller assembly is removed from the bottom of the pump to avoid interference
with the surrounding piping and pump mounting on the apparatus chassis. (See Fig-
ure 2-7: “Typical Midship Two-Stage Centrifugal Pump” on page 27.)
Two tank suction valve locations are available to allow higher flows from the booster
tank. Optional built-in check valves are available to prevent tank over-pressurization.
Both pumps include two large suction inlets on the left and right side. Optionally, addi-
tional front and rear inlets may be added as needed. Impeller inlets are on opposite
sides of the pump to balance axial forces; discharges are on opposite sides to bal-
ance radial forces.