Valves and valve actuation – With means to increase head and seat contact pressure – Gate valve
Reexamination Certificate
2011-07-19
2011-07-19
Fristoe, Jr., John K (Department: 3753)
Valves and valve actuation
With means to increase head and seat contact pressure
Gate valve
C251S175000, C251S193000
Reexamination Certificate
active
07980529
ABSTRACT:
A vacuum gate valve includes a closure disk for gas-tight closing of an opening. A connecting rod with which the closure disk is coupled is linearly adjustable by means of a linear drive unit and the closure disk is thus displaceable between a position uncovering the opening and an intermediate position pushed over the opening. At least two limbs are pivotably mounted at one limb end on the back of the closure disk via a first joint and at the other limb end on a support via a second joint to press the closure disk into the closed position. The limbs, the back and the support form an articulated parallelogram. Each of the limbs forms, with the respective first and second joints, a common integral part which includes a resilient material, the first joint and the second joint being formed by a flexible section on the limb.
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Fristoe, Jr. John K
Muncy Geissler Olds & Lowe, PLLC
VAT Holding AG
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