Valves and valve actuation – With means to increase head and seat contact pressure – With positive reduction
Reexamination Certificate
2007-09-10
2010-06-08
Bastianelli, John (Department: 3753)
Valves and valve actuation
With means to increase head and seat contact pressure
With positive reduction
C251S198000
Reexamination Certificate
active
07731156
ABSTRACT:
A vacuum valve including a valve housing two valve openings, a closure member having two closure plates, a transverse drive unit for adjusting the closure member between an open position and an intermediate position where the closure plates cover the valve openings, a first longitudinal drive unit for adjusting the closure member between the intermediate position and a first closed position, and a second longitudinal drive unit for adjusting the closure member between the intermediate position and a second closed. Each longitudinal drive unit includes a plurality of actuating elements which are guided into the vacuum area of the valve housing. These actuating elements are adjustable by driving elements between a retracted, passive position where their actuating ends are raised from the closure member and an advanced, active position where their actuating ends are pressed against the closure member and press the respective closure plate against the respective valve seat.
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Bastianelli John
Frommer & Lawrence & Haug LLP
Vat Holding AG
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