Howden WRV, Service Manual

Page: 7 / 64

6
2.2 THE COMPRESSION CYCLE (DIAGRAMMATIC ONLY)
1. Gas is drawn in to fill the
interlobe space between
adjacent lobes on top side of
rotors at Inlet End.
2.
As the rotors rotate, the interlobe space moves past
the inlet port so sealing the interlobe space.
Viewed from the top side of rotors at Inlet End.
4.
When the interlobe space becomes exposed
to the outlet port the gas is discharged.
Viewed from the underside of rotors at
Discharge End.
3
. Continued rotation progressively
reduces the space occupied by the
gas, causing compression. Viewed
from underside of rotors at Discharge
End.