Pumps – With condition responsive pumped fluid control – Pressure responsive relief or bypass valve
Patent
1992-03-13
1993-02-02
Bertsch, Richard A.
Pumps
With condition responsive pumped fluid control
Pressure responsive relief or bypass valve
417440, F04B 4900
Patent
active
051833956
ABSTRACT:
A variable capacity rotary screw compressor having a rotor housing including a bore, an inlet, an outlet, a slide valve recess and rotors. Passive and active slide valves are mounted in the recess. Individual passive and active slide valve balancing units are connected to the passive and active slide valves respectively. A prime mover is connected to selectively regulate the position of the active slide valve. A first conduit is connected between the housing inlet and the passive and active slide valve balancing units and includes a first valve operable to either open or close the first conduit. A second conduit is connected in fluid communication between the outlet and the passive and active slide valve balancing units and includes a second valve operable to either open or close the second conduit. A first sensor provides a first signal proportional to suction pressure. A second sensor provides a second signal proportional to discharge pressure. A third sensor provides a third signal proportional to the position of the active slide. A control receives the first, second and third signals and provides: first and second control outputs to open either the first or the second valve to balance the passive and active slide valves with either suction or discharge pressure; and a third control output connected to the prime mover for regulating the position of the active slide valve.
REFERENCES:
patent: Re31379 (1983-09-01), Shaw
patent: 4516914 (1985-05-01), Murphy
patent: 4575323 (1986-03-01), Yoshimura
patent: 4704069 (1987-11-01), Kocher et al.
patent: 4743170 (1988-05-01), Marshall
patent: 5044894 (1991-09-01), Field et al.
patent: 5123822 (1992-06-01), Yoshimura
patent: 5135374 (1992-08-01), Yoshimura et al.
Basichas Alfred
Bertsch Richard A.
Vilter Manufacturing Corporation
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