S0708460K
Page 5
Main Pump (Denison T6DMY Series)
PRINCIPLES OF OPERATION
Pumping Cartridge
As mentioned in "Construction," fluid flow is developed in the pumping cartridge. The action of the
cartridge is illustrated in Figure 3. The rotor is driven within the ring by the drive shaft, which is coupled to a
power source. As the rotor turns, centrifugal force on the vanes, aided by under-vane pressure fed from the
outlet port, causes the vanes to follow the elliptical inner surface of the ring.
Radial movement of the vanes and turning of the rotor causes the chamber volume between the vanes to
increase as the vanes pass the inlet sections of the ring. This results in a low pressure condition which
allows atmospheric pressure to force fluid into the chambers.
An additional inlet fluid path exists through a drilled hole in the cam ring. This hole connects the inlet port
directly to the inlet areas of the cam ring and provides an additional flow path for fluid to get into the
cartridge. (See Figure 2.)
Fluid is trapped between the vanes and carried past a sealing land to the outlet section of the ring. As the
outlet section is approached, the chamber volume decreases and the fluid is forced out into the system.
System pressure is fed under the vanes, assuring their sealing contact against the ring during normal
operation.
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