Valves and valve actuation – With means to increase head and seat contact pressure – Seat pressed to valve
Reexamination Certificate
2007-12-18
2007-12-18
Bastianelli, John (Department: 3753)
Valves and valve actuation
With means to increase head and seat contact pressure
Seat pressed to valve
C251S355000, C277S646000
Reexamination Certificate
active
10501649
ABSTRACT:
A guillotine valve, used for example in pipelines includes a single block body incorporating sealing elements, each in the form of an annular hose section, which are made of an elastomeric material and which are hollow along their entire circumference, each providing an airtight pneumatic circumferential chamber filled with air. Due to the compressibility of the chambers the contact faces of the hose sections deform uniformly in relation to a closing blade. Convex contours on the internal faces of the hose sections result in a further sealing effect due the pressing together of the contact faces by the pressure of the pipeline fluid. The hose sections can each also incorporate a T-shaped metal core comprising an axial portion and a radial portion.
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patent: 2091845 (1982-08-01), None
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Bastianelli John
Weir Do Brasil Ltda.
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