Double eccentric butterfly valve and manufacturing method therefor
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United States of America Patent
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May 14, 2024
Grant Date -
May 18, 2023
app pub date -
Mar 18, 2021
filing date -
Mar 18, 2021
priority date (Note) -
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status (Latency Note)
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Abstract
An eccentric butterfly valve, suitable for high-pressure fluids, in which: even if a dimensional error among components is large, the seat ring is aligned with the disk while sealability between the seat ring and the body is ensured; for either pressure, positive pressure or counter pressure, the seal surface pressure between the disk and the seat ring is ensured to achieve sealability; and a continuous seal portion is ensured between the body and the seat ring, thereby reliably inhibiting fluid leakage, and a method of manufacturing the eccentric butterfly valve. A tapered surface 31 formed on a seat ring 20 and a step portion 30 formed on a body 2 are opposed to each other. With a corner portion 35 of the step portion 30 on a tapered surface 31 side digging into the tapered surface 31, an annular seal portion 33 is formed on an opposed plane between the body 2 and a seat ring 6.
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