DIRECTIONAL CONTROL VALVE
United States Patent 3426647

Inventors:
Martin, George J.
Stacey, Hugh J.
Publication Date:
02/11/1969
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Assignee:
PARKER HANNIFIN CORP
Primary Class:
91/29
Other Classes:
91/436, 137/596
International Classes:
B60K17/10; B66F9/22; F15B13/04; F16K11/07; B66F9/20; F15B13/00; F16K11/065; F15B11/00; F15B13/00
US Patent References:
3263574Speed and directional control valve for double acting lift cylinder
3299903Fluid system and valve assembly therefor




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