| 摘要 |
A butterfly fluid flow valve having a full-on, full-off, and an intermediate flow position. The intermediate flow position is provided by a bleed port formed in the butterfly element which can be closed off by contact of the butterfly element with a transverse wall portion formed within the valve body. The sealing lip of the butterfly element is adapted to seal against the interior wall of the valve body in the intermediate flow position to leave only the bleed port open.
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