Valves and valve actuation – With means to increase head and seat contact pressure – Gate valve
Reexamination Certificate
2005-06-14
2005-06-14
Keenan, James W. (Department: 3652)
Valves and valve actuation
With means to increase head and seat contact pressure
Gate valve
C414S939000, C251S197000
Reexamination Certificate
active
06905107
ABSTRACT:
A sealable door assembly including a frontplate which faces an opening to be sealed, a backplate operatively coupled to the frontplate, and at least one inflatable member located between the frontplate and the backplate. When inflated, the inflatable member moves the frontplate into sealing engagement with the opening. In one embodiment the inflatable member includes one or more vacuum grade bellows. A movable mechanism moves the door assembly to selectively occlude the opening. Once the door assembly occludes the opening, the inflatable member is inflated and expands forcing the frontplate in a direction normal to the opening, thereby sealing the opening. The door assembly may be mounted within a pocket formed in an outer wall of a transfer chamber, and a sealing plate may be employed to form a gas tight region within the pocket. The gas tight region may be pressurized to enhance the door's seal of the opening.
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VAT Series 19 Large Gate Valves Data Sheet, pp. 60-61.
VAT Series 48 All-Metal Gate Valve Data Sheet, pp. 106-107.
VAT Series 12 Vacuum Gate Valve Data Sheet, pp. 40-41.
Dugan & Dugan
Keenan James W.
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