Heat treatment apparatus and valve device for use in the same

Details Heat treatment apparatus and valve device for use in the same Heat treatment apparatus and valve device for use in the same

1994-12-28

1997-09-30

Look, Edward K.

Valves and valve actuation

Biased trip

Electrical trip actuation

251264, 251273, 2513353, F16K 3144

Patent

active

056719035

ABSTRACT:
The present invention relates to a heat treatment apparatus, specifically a valve device for use in an exhaust system of a low pressure heat treatment furnace, which comprises urging device for urging a valve body in a valve closing direction, and a drive unit for opening/closing the valve body against an urging force of the urging device. An interconnection releasing mechanism is provided between the driving unit and the valve rod of the valve body, the interconnection releasing mechanism connecting both with each other, and releasing their connection in an emergency. Thus, an exhaust system of the low pressure heat treatment furnace is instantaneously shut off in an emergency to prevent reverse flow of exhaust gas into the furnace. An evacuation fine adjustment gap is defined between the periphery of the valve body and that of the valve casing for facilitating evacuation control.

REFERENCES:
patent: 2630832 (1953-03-01), Lutherer
patent: 2638929 (1953-05-01), Delany et al.
patent: 2875616 (1959-03-01), Marks
patent: 3084901 (1963-04-01), Thorburn
patent: 3422329 (1969-01-01), Anderson et al.
patent: 4793589 (1988-12-01), Eldredge et al.
patent: 5113908 (1992-05-01), Steinke
patent: 5165652 (1992-11-01), Nicolaisen

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