Fluid handling – Systems – Multi-way valve unit
Patent
1976-03-08
1977-10-18
Cohan, Alan
Fluid handling
Systems
Multi-way valve unit
60432, 60481, 251 25, F16K 31122
Patent
active
040541550
ABSTRACT:
This invention describes a valve in which the flow gate is operated by a piston in a hydraulic cylinder. The piston is forced axially, against the resistance of a coiled spring, by means of hydraulic fluid pressure provided by a motor driven pump. Electrical limit switches are provided on the movement of the piston. A check valve is provided in the output of the pump so that once the gate has been moved to the desired position as set by the limit switch, the motor will be stopped and the piston will remain in its position. To reset the piston to its original position, a solenoid by-pass valve is provided which is energized when the motor is energized, and when de-energized, provides a bypass between the cylinder and a sump, so that the pressure on the piston is released to atmospheric and the spring will force the piston back to its starting point.
REFERENCES:
patent: 337118 (1886-03-01), Belden
patent: 1244317 (1917-10-01), Gaffney
patent: 2399294 (1946-04-01), Ray
patent: 2414484 (1947-01-01), Page
patent: 2597050 (1952-05-01), Audemar
patent: 2897650 (1959-08-01), Carlson
patent: 3120103 (1964-02-01), Beard et al.
patent: 3175500 (1965-03-01), Zeigler
patent: 3648718 (1972-03-01), Curran
patent: 3825091 (1974-07-01), Geselbracht et al.
patent: 3951170 (1976-04-01), Hill
Cohan Alan
Michalsky Gerald A.
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