Valves and valve actuation – With means to increase head and seat contact pressure – Gate valve
Reexamination Certificate
2007-05-22
2009-11-03
Fristoe, Jr., John K (Department: 3753)
Valves and valve actuation
With means to increase head and seat contact pressure
Gate valve
C251S158000, C251S326000
Reexamination Certificate
active
07611122
ABSTRACT:
A closure device for closing an opening in a wall in a vacuum-tight manner comprises a closure plate, a carrying unit which carries the closure plate and which has at least one longitudinal piston-cylinder unit, and a base unit which carries the carrying unit and has at least one transverse piston-cylinder unit. A closing cylinder space of the at least one longitudinal piston-cylinder unit is connected to a closing cylinder space of the transverse piston-cylinder unit, or of at least one of the transverse piston-cylinder units, by means of a closing pressure gas channel, and an opening cylinder space of the at least one longitudinal piston-cylinder unit is connected to an opening cylinder space of the transverse piston-cylinder unit, or of at least one of the transverse piston-cylinder units, by means of an opening pressure gas channel. The closing cylinder spaces and the opening cylinder spaces of the transverse piston-cylinder unit and longitudinal piston-cylinder unit are acted upon by pressure for closing the closure device, and only the opening cylinder spaces of the transverse piston-cylinder unit and longitudinal piston-cylinder unit are acted upon by pressure for opening the closure device. The closing piston surface of the at least one transverse piston-cylinder unit is greater than the opening piston surface of the at least one transverse piston-cylinder unit, and the closing piston surface of the at least one longitudinal piston-cylinder unit is greater than the opening piston surface of the at least one longitudinal piston-cylinder unit. The ratio between the closing piston surface and the opening piston surface of the at least one transverse piston-cylinder unit is greater than the ratio between the closing piston surface and the opening piston surface of the at least one longitudinal piston-cylinder unit.
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Fristoe, Jr. John K
Reed Smith LLP
VAT Holding AG
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