Title: Combination manual and pilot operated directional control valve

Abstract: A regular manual lever operated directional control valve is converted to a remote pilot controlled valve without loss of the manual operation feature. A double acting cylinder is attached to the end of the valve housing remote from the manual lever and the piston rod in the cylinder is directly attached to the valve spool. Semi-automatic operation is provided by mounting a valve positioning unit to the end of the operating cylinder and attaching it to the other end of the piston rod. This unit includes pressure released detent mechanism. Pressure buildup in the valve ports is transmitted to a detent release piston by passages through the valve spool and piston rod.

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Inventors: Guigliano, Anthony V. (Lisle, IL, US)

Application Number: 523912
Filing Date: 1974-11-14
Publication_date: 1976-02-24
Assignee: Deltrol Corporation (Bellwood, IL)
Primary Class(es): 137/624.27 137/625.6, 137/625.63
Other Classes:
US Patent Ref:

2765378	Oct, 1956	Perry	137/625.
2874720	Feb, 1959	Vabs	137/624.
3106135	Oct, 1963	McAfee	137/625.
3736958	Jun, 1973	Rostad	137/625.

Other Refs:
Primary Examiner: Cohan, Alan
Assistant Examiner:
Attorney: Harris; John L.