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The Simplex Super-XL Pump
consists of one drive gear shrink fit on a precision ground and
polished drive shaft. This shaft extends outside the pump to
permit coupling to an external prime mover by means of a standard
key way. The second gear being the driven gear is also shrink
fit on a precision ground and polished driven shaft. Retaining
rings installed in grooves provided on the shaft ensure that
the gears will not move axially and a key keeps the drive gear
from moving rapidly.
A lip type shaft seal is provided at the drive shaft to prevent
external leakage of pump fluid. The sealing lip in contact with
the fluid is spring loaded. Vent passages within the housings
and driven shaft communicate pump inlet pressure to the rotary
seal area, thus imposing the lowest possible pressure to the
rotary seal for extended life.
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The phenolic heat shield, backup
gasket, and molded rubber seal form chambers behind the steel
backed bronze wearplate. These chambers are connected either
to inlet or discharge pressure. Discharge pressure, acting within
the chambers, axially loads and deflects the wearplate toward
the gear faces to take up gear side clearances. This pressure
loading on the wearplate increases on the wearplate increases
pump efficiency by reducing internal leakage to a minimum, providing
longer pump life.
Pump rotation is dependent on proper orientation of the heat
shield, backup gasket, and rubber seal in the front cover housing,
the center section and rear cover oriented respectively. Pumping
action is achieved by connecting the pump drive shaft to a prime
mover and rotating the gears away from the inlet port. Rotation
causes the gear mesh to increase on the inlet side and decrease
on the outlet (pressure) side.
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