Control valve for a hydraulic motor

Details Control valve for a hydraulic motor Control valve for a hydraulic motor

2011-04-12

2011-04-12

Schneider, Craig M (Department: 3753)

Fluid handling

Systems

Multi-way valve unit

C137S625690

Reexamination Certificate

active

07921879

ABSTRACT:
A pilot valve (3) is designed as a directional control valve in which a control slide (20) is movably disposed in a longitudinal bore (22) of the valve body (21) 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 (32) which is biased with the aid of a bias spring (33) is disposed within the control slide (20). The check valve (32) is connected to an auxiliary control groove (28) via a first transversal bore (29) while being connected to the B-reservoir groove (23) via a second transversal bore (31). The check valve (32) is to be opened from working connecting bore B while the auxiliary control groove (28) is arranged between the B control groove (24) and the B reservoir groove (23) and is delimited on both sides by means of sealing cylindrical areas (35, 36).

REFERENCES:
patent: 3265088 (1966-08-01), Williams
patent: 3738379 (1973-06-01), Wilke
patent: 4232584 (1980-11-01), Fassbender
patent: 4413650 (1983-11-01), Kropp
patent: 7581562 (2009-09-01), Steinhilber et al.
patent: 2004/0226292 (2004-11-01), Luo
patent: 39 41 802 (1991-06-01), None
patent: 41 36 991 (1993-05-01), None
Search Report dated Mar. 13, 2006 issued for the corresponding International Application No. PCT/CH2005/000717.

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