Title: Throttling slot configuration for a valve spool

Abstract: A throttling slot is formed in a control valve spool and interconnects a reduced diameter portion and a peripheral surface of a land provided on the spool with the throttling slot including a pocket recessed into the land at an angle inclined in the direction opposite to the normal direction of movement of the spool for effecting fluid flow through the throttling slot, and a longitudinally extending groove from the pocket which terminates in an end intersecting the reduced diameter portion.

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Other info:

Inventors: Schexnayder, Lawrence F. (Joliet, IL, US)

Application Number: 546950
Filing Date: 1975-02-04
Publication_date: 1977-03-01
Assignee: Caterpillar Tractor Co. (Peoria, IL)
Primary Class(es): 251/282 137/625.3, 137/625.69
Other Classes:
US Patent Ref:

2812775	Nov, 1957	Hodgson	251/282.
2971536	Feb, 1961	Junck et al.	251/282.
3009480	Nov, 1961	Miller	251/282.
3123335	Mar, 1964	Darling	251/282.
3198212	Aug, 1965	Junck et al.	137/625.
3556155	Jan, 1971	Morris	137/625.

Other Refs:
Primary Examiner: Rosenthal, Arnold
Assistant Examiner:
Attorney: Hart; Frank L.