Valves and valve actuation – With means to increase head and seat contact pressure – With positive reduction
Patent
1994-02-14
1995-05-16
Fox, John C.
Valves and valve actuation
With means to increase head and seat contact pressure
With positive reduction
251 64, 251193, F16K 300
Patent
active
054153751
ABSTRACT:
The closing system has a closure member, and a carriage for translational displacement of the closing member along rails. A jack is mounted on the carriage for non-resilient axial displacements of the closure member to and from a flow opening. A damper transmits the vibrations of the closure member to the carriage and ensure axial displacement of the closure member. The closure member closes the flow opening by first axially aligning the closure member with respect to the flow opening by displacing the carriage. The jack axially displaces the closure member to urge the closure member against the flow opening to close it without translational displacement. The closure member is retracted away a minimal distance from the opening for clearance and then the carriage is actuated to reduce or enlarge the flow opening, with precision and without friction to a seal disposed about the opening.
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patent: 4238111 (1980-12-01), Norman
patent: 4570670 (1986-02-01), Johnson
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