Device for controlling a hydraulic power circuit

Details Device for controlling a hydraulic power circuit Device for controlling a hydraulic power circuit

1980-07-10

1982-09-14

Cohen, Irwin C.

Motors: expansible chamber type

With motive fluid valve

Plural separately controlled waste passages for single...

91418, 91449, 13759612, 251 25, 251334, F15B 13042, F16K 31143

Patent

active

043489451

ABSTRACT:
The control device is applicable as a hydraulic regulating valve for controlling a power lift unit of a tractor and comprises a mechanically actuated preliminary selector valve operable for reciprocal movement to close or open pressure fluid supply into a control chamber counteracting a reciprocal main pressure control valve that is spring loaded against the control chamber. To avoid permanent choking resulting from pressure changes due to the movement of the control edges, a section of the preliminary control slide is recessed to such an extent as to exert elastic extension when subject to increased pressure, the extension being within the limits of elasticity of the material of the slide.

REFERENCES:
patent: 3370613 (1968-02-01), Weaver
patent: 3985153 (1976-10-01), Thomas
patent: 4069746 (1978-01-01), Schwerin et al.

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