George G Fiala

US Patent:

6450194, Sep 17, 2002

Filed:

Sep 26, 2000

Appl. No.:

09/670191

Inventors:

Jeffrey B. Wasson - Union Grove WI
David W Swaim - Joliet IL
George T. Fiala - Racine WI

Assignee:

Case Corporation - Racine WI

International Classification:

F15B 1304

US Classification:

137351, 1376253, 13762569

Abstract:

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.