F - Mech Eng,Light,Heat,Weapons – 04 – C
Patent
F - Mech Eng,Light,Heat,Weapons
04
C
230/31, 230/39,
F04C 18/00 (2006.01) F04B 19/12 (2006.01) F04B 49/00 (2006.01) F04B 49/02 (2006.01) F04B 49/08 (2006.01) F04C 18/16 (2006.01)
Patent
CA 1047463
CONTROL SYSTEM FOR HELICAL SCREW COMPRESSOR ABSTRACT OF THE DISCLOSURE A helical screw air compressor unit has a rotary capacity control valve, a compressor inlet throttling valve, and a pressure relief valve for venting the compressor discharge conduit. A control circuit senses pressure in the compressed air supply system downstream of the compressor and operates the capacity control valve, inlet throttling valve, and pressure relief valve in a predetermined sequence to provide an improved power consump- tion characteristic for variable demand compressor applications. The control circuit includes a hydraulic control valve and an actuator for operating the rotary capacity control valve to regu- late compressor throughput to maintain a predetermined pressure without overpressuring the supply system during operation at conditions of reduced demand for compressed air.
269365
Herschler Michael G.
Post Roger L.
Shoop John C.
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