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. 13, 2001
Filed:
Oct. 07, 1999
Applicant:
Inventors:
Werner Reith, Eussenheim, DE;
Binh Nguyen Xuan, Frammersbach, DE;
Assignee:
Mannesmann Rexroth AG, Lohr, DE;
Primary Examiner:
Int. Cl.
CPC ...
F15B 1/3043 ; F16K 3/700 ;
U.S. Cl.
CPC ...
F15B 1/3043 ; F16K 3/700 ;
Abstract
A directional control valve has an axially displaceable control piston inside a valve housing and a travel sensor arranged on the valve housing to detect the position of the control piston. The sensor includes a travel sensor tube which is pressure tight and sealed on one end and has a directional transmitter rod extending into the other end. The directional transmitter rod is secured to the control piston and extends through the area connecting the inside of the valve housing to the travel sensor tube. A seal exposes a dampening gap placed in the connecting area forming a throttle point enabling oil to flow into the travel sensor tube.