Automatic hydraulic reversing valve for a double-action working

Details Automatic hydraulic reversing valve for a double-action working Automatic hydraulic reversing valve for a double-action working

1983-05-13

1985-04-30

Garrett, Robert E.

Motors: expansible chamber type

Cyclically operable

Multiple exhaust passages

91240, 91299, 91318, 91337, 137106, 13762414, 13762427, F01L 1500

Patent

active

045136530

ABSTRACT:
This invention relates to an automatic hydraulic reversing valve for a double-action working cylinder. The purpose of the invention is to employ valves of this type without the requirement of an expensive servo-control mechanism, but nevertheless having a high operating reliability. The present invention, in avoiding the use of servo-control devices, utilizes a separate thrust piston which urges a control piston into a startup position, at which position the hydraulic medium is directed to the thrust piston end of the control piston, a blocking slide valve also being employed in the system and being mounted in the control piston for connecting the thrust piston end of the control piston to a tank or for blocking the connection to the tank.

REFERENCES:
patent: 2090583 (1937-08-01), Morton
patent: 2711717 (1955-06-01), Stacey
patent: 2862518 (1958-12-01), McAlvay
patent: 3680583 (1972-08-01), Clair
patent: 3742971 (1973-07-01), Worthington

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