Valves and valve actuation – With means to increase head and seat contact pressure – With positive reduction
Reexamination Certificate
2005-02-15
2005-02-15
Look, Edward K. (Department: 3754)
Valves and valve actuation
With means to increase head and seat contact pressure
With positive reduction
C251S178000, C251S187000, C251S195000, C251S327000
Reexamination Certificate
active
06854708
ABSTRACT:
A valve achieves a high-vacuum seal and opens and closes with no sliding or otherwise abrading contact between the sealing plate and the valve seat, while maintaining pressure of the plate against the valve seat in the event of a failure in the valve actuation mechanism. These results are attained by use of a composite valve plate that includes a sealing plate joined to a support block through a retractable resilient connector. During retraction, the sealing plate is drawing close to the block by a pneumatic actuator internal to the composite valve plate, the actuator arranged to oppose and overcome a mechanical resilient element also contained within the valve plate that urges the sealing plate outward from the support block to effect the seal when the actuator is not engaged.
REFERENCES:
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patent: 4718637 (1988-01-01), Contin
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Contin Jose L.
Ulea Neli
Fristoe Jr. John K.
Heines M. Henry
Look Edward K.
MDC Vacuum Products Corporation
Townsend and Townsend / and Crew LLP
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