Heat treatment apparatus and valve device for use in the same
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United States of America Patent
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-
Sep 30, 1997
Grant Date -
N/A
app pub date -
Dec 28, 1994
filing date -
Dec 29, 1993
priority date (Note) -
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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.
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