Screw compressor slide valve engine rpm tracking system

Details Screw compressor slide valve engine rpm tracking system Screw compressor slide valve engine rpm tracking system

F - Mech Eng,Light,Heat,Weapons

04

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230/34

F04D 27/00 (2006.01) B60H 1/32 (2006.01) F25B 1/047 (2006.01) F25B 49/02 (2006.01)

Patent

CA 1179997

SCREW COMPRESSOR SLIDE VALVE ENGINE RPM TRACKING SYSTEM ABSTRACT OF THE DISCLOSURE A vehicle engine driven helical screw compressor for a gas refrigeration system includes a slide valve actuator for shifting the compressor slide valve to load and unload the compressor. In addition to a first solenoid operated control valve selectively connecting the slide valve actuator to compressor high side pressure to effect loading of the compressor and a second solenoid operated control for connecting the slide valve actuator to the compressor low side pres- sure to effect unloading, a tracking valve responsive to engine acceleration and deceleration connects the slide valve actuator to the low side pressure during engine acceleration for immediate unloading of the compressor and connects the slide valve actuator to the high side pressure during engine deceleration to immediately load the compressor.

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