F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
137/75
F16K 31/00 (2006.01)
Patent
CA 1056691
ABSTRACT OF THE DISCLOSURE 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 meter 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.
285578
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