Fluid handling – Systems – Multi-way valve unit
Patent
1998-06-09
1999-06-15
Michalsky, Gerald A.
Fluid handling
Systems
Multi-way valve unit
13762569, 25112907, F15B 13044
Patent
active
059112450
ABSTRACT:
A spool valve comprising a body portion with a general center bore, three annular chambers and a seal land between adjacent chambers, a spool portion slidably disposed in the bore and having two semicircular circumferential grooves to form a spool land associated with each of the chambers, the spool lands and seal lands being so disposed that when the spool is in a first position the annular chamber on one end is in fluid communication with the center chamber and the spool land associated with the one end chamber and the spool land associated with the center chamber are equidistant from the adjacent seal land and the other seal land and the spool land associated with the chamber on the other end cooperates with the other seal land to form a seal between the center chamber and the other end chamber and when in a second position the annular chamber on other end is in fluid communication with the center chamber and the spool land associated with the other end chamber and the spool land associated with the center chamber are equidistant from the adjacent seal land and the other seal land and the spool land associated with the chamber on the one end cooperates with the other seal land to form a seal between the center chamber and the other end chamber, whereby the flow forces of high pressure fluid acting on the spool cancel out and the force required to move to the spoon between positions is minimized
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Beahr Fred J.
Cain Larry G.
Caterpillar Inc.
Michalsky Gerald A.
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