| 摘要 |
<p>A valve with a tapered plug 36 that seats in a through flow passage 34 in the body 12. The plug has a through opening so that by rotating the plug through 90.degree. one can control flow through the valve. The plug is tapered and, as it is rotated in the counter-clockwise direction to open, it is also lifted slightly from its seats by rotation of the stem 26. As it is rotated in the clockwise direction to close, the plug is pressed slightly down to form a sealing engagement with its seat in the body. The combination of rotational and vertical movements - in effect a spiral motion of the plug provide a valve that has an effective seal, ease of manipulation and full throttling with 1/4 turn of the tapered plug. The plug is mounted on a stem 26 which, in turn, threadedly engages with a mounting nut 46 that can be threadedly set in a seat on the body with any desired seating pressure of the plug on the plug seat in the body and then clamped in position as the valve is assembled.</p> |
