| 摘要 |
A flow control valve for selectively opening and obstructing a flow passageway defined by a conduit. The valve has a mounting block, first and second valve wings, each mounted to the block for rotation about parallel axes between open and closed position, and structure for simultaneous moving the first and second valve wings between their open and closed positions. The first and second valve wings are each rotatable oppositely about their respective axes in moving between corresponding open and closed positions.
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