Method of shutting off conduit and pipe conduit shutoff apparatus
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United States of America Patent
Stats
-
May 29, 2012
Grant Date -
Jul 2, 2009
app pub date -
Aug 25, 2008
filing date -
Dec 28, 2007
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
To enable efficient and easy attachment of a shutoff operation cover at a proper attaching position relative to two joining flange portions and also to restrict deformation in a leading end portion of a gate plate valve. A shutoff operation cover B is attached to two pipe portions 2, 3 jointed and fastened together with a fastener 5. The shutoff operation cover B is capable of surrounding outer peripheries of the two joining flange portions 2A, 3A under a sealed condition, and there is provided a gate plate valve 10 in the form of a thin plate, the valve being insertable and withdrawable for shutting off conduits of the two pipe portions 2, 3. As the gate plate valve 10 is inserted to a conduit shutting position through a gap S formed between the two joining flange portions 2A, 3A in association with a loosening operation of the fastener 5, the conduit is shut off between the two joining flange portions 2A, 3A. When the shutoff operation cover B is attached to the two pipe portions 2, 3, a leading end 10b of the gate plate valve 10 located at a conduit opening position is advanced into an annular gap 26 formed on the outer peripheral sides of opposing faces of the two joining flange portions 2A, 3A.
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Cited Art Landscape
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