Valve arrangement for capacity control of screw compressors

Details Valve arrangement for capacity control of screw compressors Valve arrangement for capacity control of screw compressors

1983-09-14

1985-02-12

Gluck, Richard E.

Pumps

With condition responsive pumped fluid control

Normally open bypass or relief passage closed by increased...

417310, 417440, F04C 1816

Patent

active

044988494

ABSTRACT:
The invention relates to a valve arrangement for capacity control of an oil-injected screw compressor. One or more piston valves are arranged one after the other in the axial direction of the rotors at the portion of the rotor barrels where the internal compression phase occurs. The compressor control valves are actuated by the discharge pressure, which in their turn open or close the piston valves. When the piston valves are open, a portion of the gas in the compression space is discharged to a bleed off passageway and it flows back to the inlet port of the compressor so that substantially no compression work is spent on this portion of the gas.

REFERENCES:
patent: 1481358 (1924-01-01), Dwyer
patent: 3045447 (1962-07-01), Wagenius
patent: 3088658 (1963-05-01), Wagenius
patent: 3088659 (1963-05-01), Nilsson et al.
patent: 3108739 (1963-10-01), Nilsson et al.
patent: 3108740 (1963-10-01), Schibbye
patent: 3314597 (1967-04-01), Schibbye
patent: 3432089 (1969-03-01), Schibbye
patent: 4042310 (1977-08-01), Schibbye et al.

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