| 摘要 |
A rotatable valve structure, such as a butterfly valve, wherein the shaft is movable axially, with a camming surface on the shaft engaging a complementary camming surface on the disc to produce transverse movement of the valve disc in response to axial movement of the shaft. Hence, the valve disc may be turned to a face-to-face position relative to the seat and then, in response to axial movement of the shaft, pressed into firm seating engagement. Both the rotary and axial movements of the shaft are produced by rotary movement of an operator. Means are provided for adjusting the plane of the disc.
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