Valves and valve actuation – With means to increase head and seat contact pressure – Fluid pressure
Reexamination Certificate
2007-09-18
2007-09-18
Bastianelli, John (Department: 3753)
Valves and valve actuation
With means to increase head and seat contact pressure
Fluid pressure
C251S195000, C251S302000, C251S335300
Reexamination Certificate
active
10890819
ABSTRACT:
A pendulum gate valve includes a housing defining a valve chamber, the valve housing having a vacuum-chamber opening in a front wall and an access opening in a rear wall aligned with the vacuum-chamber opening and defining a through-hole extending from one side of the valve housing to the other side for providing access to the vacuum chamber, a carriage assembly pivotally mounted within the valve housing and moveable between a open position remote from the openings and a closed position between the openings, a valve plate reciprocally mounted on one side of the carriage assembly and movable between an unsealed position spaced from the vacuum-chamber opening and a sealed position sealing the vacuum-chamber opening, a valve-plate actuator carried on the carriage assembly for moving the valve gate between the unsealed and sealed positions, a retractable support reciprocally mounted on another side of the carriage assembly movable between a retracted position spaced from the access opening and an extended position engaging the valve housing adjacent the access opening, and a retractable-support actuator carried on the carriage assembly for moving the valve support between the retracted and support positions. Preferably, the valve-plate and retractable-support actuators are fluid actuators. A method of using the pendulum gate valve is also disclosed.
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Bastianelli John
Brezner David J.
Johnson Victor E.
Morgan & Lewis & Bockius, LLP
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