Pumps – With condition responsive pumped fluid control – Inlet throttle or stop valve
Patent
1976-05-11
1977-10-04
Freeh, William L.
Pumps
With condition responsive pumped fluid control
Inlet throttle or stop valve
417304, 417310, F04B 4902, F04B 4908
Patent
active
040521354
ABSTRACT:
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 consumption 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 regulate compressor throughput to maintain a predetermined pressure without overpressuring the supply system during operation at conditions of reduced demand for compressed air.
REFERENCES:
patent: 3260444 (1966-07-01), Williams et al.
patent: 3411702 (1968-11-01), Metot et al.
patent: 3713756 (1973-01-01), Pilarczyk et al.
patent: 3788776 (1974-01-01), Post et al.
patent: 3860363 (1975-01-01), Silvern et al.
patent: 3874828 (1975-04-01), Herschler et al.
patent: 3936239 (1976-02-01), Shaw
patent: 3961862 (1976-06-01), Edstrom et al.
Herschler Michael G.
Post Roger L.
Shoop John C.
Freeh William L.
Gardner-Denver Company
Martin Michael E.
Ross Thomas I.
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