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:
Mar. 07, 1989
Filed:
Aug. 07, 1986
Hans Wolfges, Lohr am Main, DE;
Mannesmann Rexroth GmbH, Lohr am Main, DE;
Abstract
A proportional throttle valve which varies the throttle cross-sectional area in dependence upon a control signal and thus governs the flow rate. The invention relates to a throttle valve in which the position of the valve member remains constant independent of pressure fluctuations upstream and downstream of the throttle cross-section. For this purpose the pressure acts on equisized opposing faces of the valve member. An annular face of equal magnitude lying opposite the control face is subjected to the pressure in a line leading from the pressure-limiting valve for setting the control pressure to the tank so that pressure fluctuations in this tank line cause corresponding variations of the control pressure and the position of the valve member remains constant.