High-vacuum valve with retractable valve plate to eliminate...

Details High-vacuum valve with retractable valve plate to eliminate... High-vacuum valve with retractable valve plate to eliminate...

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:
patent: 4640302 (1987-02-01), Impey
patent: 4681329 (1987-07-01), Contin
patent: 4718637 (1988-01-01), Contin
patent: 5087017 (1992-02-01), Sawa et al.
patent: 5116023 (1992-05-01), Contin
patent: 5356113 (1994-10-01), Mizuishi et al.
patent: 5577707 (1996-11-01), Brida
patent: 5975492 (1999-11-01), Brenes
patent: 20020056819 (2002-05-01), Contin et al.

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