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:
Apr. 12, 2011
Filed:
Dec. 01, 2005
Markus Eschweiler, Remscheid, DE;
Markus Eschweiler, Remscheid, DE;
Bucher Hydraulics AG, Neuheim, CH;
Abstract
A pilot valve () is designed as a directional control valve in which a control slide () is movably disposed in a longitudinal bore () of the valve body () so as to control the flow of hydraulic oil between two working connecting bores (A, B), a pump connecting bore (P), and a reservoir connecting bore (T). A check valve () which is biased with the aid of a bias spring () is disposed within the control slide (). The check valve () is connected to an auxiliary control groove () via a first transversal bore () while being connected to the B-reservoir groove () via a second transversal bore (). The check valve () is to be opened from working connecting bore B while the auxiliary control groove () is arranged between the B control groove () and the B reservoir groove () and is delimited on both sides by means of sealing cylindrical areas ().