Motors: expansible chamber type – With motive fluid valve – Relatively movable serial valves
Patent
1993-03-11
1994-10-11
Look, Edward K.
Motors: expansible chamber type
With motive fluid valve
Relatively movable serial valves
91448, 91461, 91462, F15B 1108, F15B 1304
Patent
active
053536843
ABSTRACT:
In a hydraulic slide valve control for working cylinders with unequal piston speeds, in which the volume stream of the hydraulic working medium that loads the piston is adjusted to the prevailing piston speed and the direction of motion of the piston is set with a pilot-operated distribution valve, it is provided according to the invention that the redirecting valve (S3) is hydraulically pilot-operated with a pilot valve (A), which is adjustable by the control impulses for the working cylinder (1) and that between the pilot control paths (11, 12) from the pilot valve (A) to the redirecting valve (S3) a hydraulically pilot-operated control valve (B) is installed, through which runs one of the two volume streams of the hydraulic working medium, where a piston speed is assigned to each position of the control valve (B).
REFERENCES:
patent: 3763746 (1973-10-01), Walters
patent: 3835647 (1974-05-01), Huffman
patent: 3872773 (1975-03-01), Denker
patent: 3903786 (1975-09-01), Walters
patent: 3973747 (1976-08-01), Jagerstrom
patent: 4919039 (1990-04-01), Nutter
patent: 4933617 (1990-06-01), Huber et al.
Friedrich Wilh Schwing GmbH
Look Edward K.
Nguyen Hoang
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