Pumps – With condition responsive pumped fluid control – Inlet throttle or stop valve
Patent
1986-09-11
1989-11-21
Smith, Leonard E.
Pumps
With condition responsive pumped fluid control
Inlet throttle or stop valve
417362, 418 83, 418201, F04B 4900, F01C 108
Patent
active
RE0331163
ABSTRACT:
A single-stage oilless screw compressor system includes a single-stage oilless screw compressor of the type which is capable of operation without requiring oil to be fed to a working chamber of the compressor and which has a pressure ratio (discharge pressure/suction pressure) of over 4, preferably in the range between 7 and 8. The system further includes a precooler located in a gas passage on the discharge side of the compressor, a check valve located on the outlet side of the precooler and a cooler located on the outlet side of the check valve, for supplying a clean gas having no oil incorporated therein which has a pressure of above 4 kgf/cm.sup.2. The check valve for avoiding the backflow of compressed gas to the compressor is protected from a large amount of heat by the precooler mounted in the gas passage on the discharge side of the compressor, to enable the valve to operate stably and have a prolonged service life while causing the temperature of the compressed gas of high temperature released from the compressor to effectively drop to a level suitable for the use of the compressed gas.
REFERENCES:
patent: 3367652 (1968-02-01), Persson et al.
patent: 3975123 (1976-08-01), Schibbye
Hitachi , Ltd.
Smith Leonard E.
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