Valves and valve actuation – With means to increase head and seat contact pressure – With positive reduction
Patent
1992-08-05
1993-11-30
Fox, John C.
Valves and valve actuation
With means to increase head and seat contact pressure
With positive reduction
251192, F16K 520
Patent
active
052658457
ABSTRACT:
A split ball closure member is disposed in the central chamber of a valve. The closure member includes a pair of sealing ball halves each having a substantially spherical sealing surface adapted to seal against annular seats in the valve body around the flow passages, and flow portions therethrough. A head member is mounted on the end of the valve operating stem extending into the chamber, for rotation with the stem. The split ball halves are pivotably mounted to the head member to be pivotable about the mounting means alternately to separate the halves from one another or to collapse them toward one another. The closure member is rotatable with the stem and head member alternately to place the flow port portions in register with the seats to open the valve, or to align the sealing surfaces with the seats to close the valve. An actuating cam is disposed in the valve body between the split ball halves for alternately forcing them apart and the sealing surfaces into sealing engagement with the seats when the sealing surfaces are rotated into alignment with the seats, and permitting them to collapse toward one another and away from sealing engagement with the seats when the sealing surfaces are rotated out of alignment with the seats.
REFERENCES:
patent: 2277975 (1942-03-01), Heggem
patent: 3124333 (1964-03-01), Sivyer
patent: 3390861 (1968-07-01), Masheder
Fox John C.
Shull William E.
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