Safety valve

Fluid handling – Destructible or deformable element controlled – Heat destructible or fusible

Reexamination Certificate

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Details

C137S079000, C220S089400

Reexamination Certificate

active

07150287

ABSTRACT:
A safety valve comprises a main body, fixed body, meltable body, movable body, biasing member, movable plug and plug holding means. The fixed body has a small passageway communicating with the interior of a container, and an upper large passageway. The movable plug has a small portion fitting in the upper end of the small passageway of the fixed body, an intermediate portion providing a clearance therearound inside a lower end portion of the large passageway of the fixed body, and a large portion slidably fitting in an intermediate portion of the large passageway of the fixed body. The large rod portion of the movable plug has a passage extending from its upper end to its lower end, and the intermediate portion of the plug is provided with communication passageways having openings in its peripheral surface and communicating with the lower end of the passage.

REFERENCES:
patent: 2950022 (1960-08-01), Boyer
patent: 3842853 (1974-10-01), Kelly et al.
patent: 3896835 (1975-07-01), Wicke
patent: 4069834 (1978-01-01), Bern et al.
patent: 4221231 (1980-09-01), Harvey et al.
patent: 4280523 (1981-07-01), Norton
patent: 4290440 (1981-09-01), Sturgis
patent: 4727903 (1988-03-01), Sturgis et al.
patent: 5067510 (1991-11-01), Breaux et al.
patent: 5511576 (1996-04-01), Borland
patent: 6367499 (2002-04-01), Taku
patent: 6814097 (2004-11-01), Girouard
patent: 62-137483 (1987-06-01), None
patent: 02-20873 (1990-05-01), None
patent: 2641940 (1997-05-01), None
patent: 2001-317645 (2001-11-01), None

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