Hydraulic valve assembly

Details Hydraulic valve assembly Hydraulic valve assembly

1993-04-08

1994-12-13

Michalsky, Gerald A.

Motors: expansible chamber type

With motive fluid valve

Inlet fluid supplemented by controlled fluid pressurized in...

91446, 91454, 91461, 13759615, 13759616, F15B 13043

Patent

active

053720601

ABSTRACT:
A hydraulic valve assembly comprises a valve body defining first and second valve receptacle bores, a fluid pump, a first fluid passage communicated with the fluid pump, a second fluid passage communicated with a hydraulic load, and a third fluid passage communicated with a fluid reservoir. A first valve sub-assembly including a sleeve enclosing a first valve mechanism therein is disposed within the first valve receptacle body for selectively permitting and blocking introduction of the pressurized working fluid. Also, a second valve sub-assembly including a sleeve enclosing a second valve mechanism therein is disposed within the second valve receptacle bore for selectively establishing and blocking fluid communication between the second and third fluid passage means. A third valve assembly is provided in the valve body for selectively establishing and blocking fluid communication between the load side of the first valve sub-assembly and the second fluid passage for supplying the pressurized working fluid to the hydraulic load. A control valve assembly is provided in the valve body for generating a control pressure for controlling position of the first and second valve subassemblies.

REFERENCES:
patent: 4480527 (1984-11-01), Lonnemo
patent: 4646622 (1987-03-01), Ishizaki et al.
patent: 5136930 (1992-11-01), Karakama et al.

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