Case Corporation

Cnh America LLC

David W Swaim

George T Fiala

Richard J Lech

Roger D Mickelson

Dennis J Heyne

Guy T Stoever

Matthew J Hennemann

Eric Sharkness

Ian MacLeod

Jeffrey B Wasson

An insert or cartridge that fits into a cavity in a valve body provides a check valve function and an anti-cavitation function and a pressure relief function. This insert is substantially circular and has an internal cavity with a valve assembly that has two pairs of valve seats, one pair of valve seats providing the anti-cavitation function and the other pair of valve seats providing the pressure relief function. The outside of the insert itself engages with a sealing surface in the cavity in the valve body to provide the check valve function.

Low leak boom control check valve including an insert

Low leak boom control check valve

The invention provides a system for regulating pressure equalization in hydraulic mechanisms to suppress oscillation in heavy equipment. The system includes a first and second hydraulic lines, a crossover valve in communication with each of the first and second hydraulic lines, a timing system in communication with the crossover valve, and a motion detector in communication with a heavy equipment component. The motion detector senses a linkage motion and operatively opens the crossover valve, which remains open as directed by the timing system.

Hydraulic system for suppressing oscillation in heavy equipment

A spool valve includes a pressure control portion and a pair of flow control portions. Each flow control portion is adjacent to, and on opposite sides of, the pressure control portion. A first plurality of opposed notches are formed in the pressure control portion. The first plurality of notches have a first geometry. A second plurality of opposed notches are formed in each flow control portion. The second plurality of notches include at least one notch of a second geometry, different from the first geometry, and at least one notch of a third geometry, different from the first and second geometries.

Spool notch geometry for hydraulic spool valve

A variable metering fluid control valve comprising a valve body having at least one work port and one exhaust port with the ports in fluid communication with a spool bore and an exhaust core, said exhaust core having an exhaust core land and a reciprocating valve spool in the spool bore to control communication of fluid between the work port and the exhaust core, with said valve spool having a land portion with a plurality of variable length metering notches, wherein the land portion of the valve spool remains in contact with the exhaust core land through the full stroke of the valve spool. The variable length metering notches may be varied in width, depth, and cross-section so that precise control of the fluid system is achieved.

Variable metering fluid control valve

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Joliet, IL, United States of America

David W Swaim