The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 24, 2016
Filed:
Apr. 13, 2011
Engelbert Köck, Planegg, DE;
Michael Hofstetter, Wolfersdorf, DE;
Engelbert Köck, Planegg, DE;
Michael Hofstetter, Wolfersdorf, DE;
KNORR-BREMSE SYSTEME FUR SCHIENENFAHRZEUGE GMBH, Munich, DE;
Abstract
A control valve for an oil-injected screw-type compressor, in particular for installation in a vehicle, wherein oil located in a screw-type compressor housing can be supplied in a controlled manner via the control valve to a heat exchanger and/or to a bypass in such a way that cold oil is conducted through a bypass around the heat exchanger and warm oil is conducted through the heat exchanger. A control valve is provided for an oil-injected screw-type compressor and ensures rapid heating of the oil in the screw-type compressor even with a short activation time. The control valve has a control piston that is actuated by a control element and cooperates respectively with a heat exchanger opening disposed in a control valve housing and a bypass opening, and that the control piston controls at least one bypass opening which cooperates with the heat exchanger opening.