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:
Jun. 20, 1989
Filed:
Jan. 14, 1988
Applicant:
Inventor:
Helmut Ott, Stuttgart, DE;
Assignee:
Herion-Werke KG, Fellbach, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16K / ;
U.S. Cl.
CPC ...
13762564 ; 13762526 ;
Abstract
A directional control valve includes a housing with a pressure inlet port, two working ports and a vent port with one working port directly connected to the vent port and the other working port communicating with the vent port via a control piston. The control piston includes a sliding valve in the area of one working port and a seat valve in the area of the other working port. A throttle bush rotatably arranged in the housing and a throttle screw rotatable relative to the throttle bush cooperate with the control valve to modify and throttle separately and independently from each other the cross sectional ventilating areas for the working ports.