V1.4
3 of 22 04/01/2009
Model CC
Model CC pumps are designed to mount directly to NEMA 56 143 TC or 145 TC C Face
motors, with modifications available for mounting to metric C motors. They are equipped
with a mechanical seal and will pump equally well in either direction of rotation (unless
equipped with an internal relief valve).
These pumps are available in four sizes, with capacities from 6 to 30 gpm and can handle
inlet pressures to 25 psi and differential pressures to 100 psi.
The Pumping Principle
Tuthill C Series cast iron pumps employ the internal
gear pumping principle. There are only two moving
parts. Pumping action is based on a rotor, idler gear
and crescent-shaped partition cast integral with the
cover.
Power applied to the rotor is transmitted to the idler
gear with which it meshes. The space between the
outside diameter of the idler and the inside diameter
of the rotor is sealed by the crescent.
As the pump starts, the teeth come out of mesh,
increasing the volume. This creates a partial
vacuum, drawing the liquid into the pump through
the suction port.
The liquid fills the spaces between the teeth of the
idler and the rotor and is carried past the crescent
partition through the pressure side of the pump.
When the teeth mesh on the pressure side, the
liquid is forced from the spaces and out through the
discharge port.
