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The structural feature of double offset butterfly valves: the stem axis is offset from the center of the disc and the center of the body. The double eccentric feature of double offset butterfly valves affects the disc to be quickly disengaged from the valve seat after the valve is opened, which greatly eliminates unnecessary over-squeezing and scraping of the disc and the valve seat, reduces the opening resistance, wear and improves the seat life. The scraping is greatly reduced, and the double eccentric butterfly valves can also be used with a metal valve seat, which enhances the application of the butterfly valves in the high temperature field.
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