| 摘要 |
A butterfly valve for insertion between a pair of spaced flanges in a fluid flow passageway is disclosed as incorporating a tubular body having a pivotally mounted disc valve positioned in the fluid flow passageway for opened and closed positions thereof, and a resilient seal mounted in the tubular body having an inner wall for engaging the disc valve along its outer periphery when the disc valve closes the fluid flow passageway as well as spaced and opposed outer walls which complementarily engage a dovetail extension projecting from within the tubular body, the spaced and opposed outer walls of the resilient seal being separated at least partially from the dovetail extension, and the inner wall and the spaced and opposed outer walls of the resilient seal also being joined along generally right angled corner areas, thereby allowing compression of the resilient seal and lined contact engagement with the spaced pipe flanges along the corner areas thereof to provide a positive seal eliminating contamination problems with different fluid materials transported through the fluid flow passageway.
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