Multi-stage screw compressor unit accommodating high suction...

Details Multi-stage screw compressor unit accommodating high suction... Multi-stage screw compressor unit accommodating high suction...

2005-04-19

2005-04-19

Campbell, Thor (Department: 3742)

Pumps

Processes

C417S282000

Reexamination Certificate

active

06881040

ABSTRACT:
A multi-stage screw compressor unit and method of operation thereof are provided, which enable operation with high efficiency always even when suction or discharge pressure fluctuates widely, the compressor unit comprising a combination of a compression stage provided with an unloader slide valve and that provided with an internal volume ratio control valve, or a combination of compression stage provided with an internal volume control valve and that of fixed internal volume ratio, or a combination of compression stages each provided with an internal volume control valve.

REFERENCES:
patent: 4149827 (1979-04-01), Hofmann, Jr.
patent: 4544333 (1985-10-01), Hirano
patent: 4548549 (1985-10-01), Murphy et al.
patent: 4609329 (1986-09-01), Pillis et al.
patent: 4812110 (1989-03-01), Kubo et al.
patent: 5606853 (1997-03-01), Birch et al.

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