Valve for fluids having a diaphragm shutter controlled by...

Details Valve for fluids having a diaphragm shutter controlled by... Valve for fluids having a diaphragm shutter controlled by...

2006-09-06

2008-09-09

Fristoe, Jr., John K (Department: 3753)

Valves and valve actuation

Heat or buoyancy motor actuated

C251S335200

Reexamination Certificate

active

07422192

ABSTRACT:
Described herein is a valve for fluids, liquids or dusts, which can be used to particular advantage for controlling openings for passage of cooling air in refrigerating apparatuses or the like. The valve comprises a diaphragm open/close element having a central part and a peripheral edge connected, respectively, to a central support and to a peripheral support. Said supports are axially displaceable with respect to one another between a first relative end position and a second relative end position corresponding, respectively, to the open condition and to the closed condition of the valve, or vice versa. The relative displacement in an axial direction of said first and second supports is controlled by shape-memory means, including at least one shape-memory wire, which extends at least in part along the periphery of the diaphragm and is activated by electrical supply means. The heating of the wire is exploited to remove any possible formation of ice or frost that might tend to prevent correct movement of the diaphragm.

REFERENCES:
patent: 5325880 (1994-07-01), Johnson et al.
patent: 5345963 (1994-09-01), Dietiker
patent: 7198248 (2007-04-01), Butera et al.
patent: 296 13 251 (1996-11-01), None
patent: 101 33 013 (2003-01-01), None
patent: 1 653 133 (2006-05-01), None
Patent Abstracts of Japan vol. 008, No. 220, Oct. 6, 1984 & JP 59 103088, Jun. 14, 1984.
Patent Abstracts of Japan vol. 011, No. 082, Mar. 12, 1987 & JP 61 236974 A, Oct. 22, 1986.

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