2.1 THE WRV COMPRESSOR
The Howden WRV & WRVi Oil Injected Compressor is a positive displacement, capacity controlled,
oil flooded, rotary machine.
Compression is achieved by the meshing of two helical rotors on parallel shafts housed in a casing.
The accurately machined helical rotors are called Male and Female. The Male (driving) rotor has
four lobes which mesh with six flutes in the female (driven) rotor, both rotors having the same
outside diameter. Each rotor is supported by two plain white metal, thick walled, journal bearings
fitted adjacent to the compression chamber. Angular contact bearings, offloaded by internal balance
pistons accommodate the axial thrust load.
Capacity control is achieved by means of a hydraulically controlled slide valve in the compressor.
This allows internal gas re-circulation, thus controlling the capacity from 100% down to nominally
10% with power saving.
Various methods of hydraulic cylinder control are available and the appropriate literature provided by
the compressor set supplier, should be studied before carrying out any work on this equipment.
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