Combination manual and pilot operated directional control valve

Details Combination manual and pilot operated directional control valve Combination manual and pilot operated directional control valve

1974-11-14

1976-02-24

Cohan, Alan

Fluid handling

Systems

Line condition change responsive release of valve

13762563, 1376256, F15B 1301

Patent

active

039398706

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.

REFERENCES:
patent: 2765378 (1956-10-01), Perry
patent: 2874720 (1959-02-01), Vabs
patent: 3106135 (1963-10-01), McAfee
patent: 3736958 (1973-06-01), Rostad

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