Title: Rotary spool valve

Abstract: A fluid flow control valve has a rotary spool with one or more standard, circular O-rings held in stretched condition by shoulders on the spool so that instead of extending all the way around the circumference of the spool each O-ring extends only a part of the way around the circumference and has two longitudinally extending sections as well as two arcuate circumferential sections that serve to seal the spool in the spool bore both during movement and while it is in a selected fluid flow controlling position.

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Inventors: Cagle, Harlan R. (Cheboygan, MI, US)

Application Number: 689007
Filing Date: 1976-05-24
Publication_date: 1977-06-28
Assignee: Sahlin International, Inc. (Birmingham, MI)
Primary Class(es): 137/625.23 137/625.47, 251/309, 251/317, 251/900
Other Classes:
US Patent Ref:

2585556	Feb, 1952	Johnson	251/DIG.
3033226	May, 1962	Allen	251/317.
3538952	Nov, 1970	Bayer	137/625.
3938553	Feb, 1976	Ortega	137/625.

Other Refs:
Primary Examiner: Cohan, Alan
Assistant Examiner:
Attorney: Harness, Dickey & Pierce