Infinitely variable directional valve

Details Infinitely variable directional valve Infinitely variable directional valve

2004-04-05

2008-07-01

Fristoe, Jr., John K (Department: 3753)

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

C251S030010, C137S630190, C137S596000, C137S596160

Reexamination Certificate

active

07392971

ABSTRACT:
Disclosed is an infinitely variable directional valve comprising a seat slide on which a valve cone is formed which is prestressed counter to a valve seat in the initial position of the directional valve. The directional valve is configured with a pilot control device wherefore a pilot control valve seat which interacts with a pilot control valve cone is provided inside the closing cone.

REFERENCES:
patent: 2575272 (1951-11-01), Harris
patent: 2968464 (1961-01-01), Olson
patent: 4699351 (1987-10-01), Wells
patent: 4746093 (1988-05-01), Scanderbeg
patent: 5048790 (1991-09-01), Wells
patent: 196 27 306 (1998-01-01), None
patent: 100 30 059 (2001-12-01), None
patent: 100 48 600 (2002-04-01), None
patent: 0 764 785 (1997-03-01), None

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