| 摘要 |
<p>A valve wherein a spherically shaped half ball element (20) is arranged for rotation between open and closed positions with respect to a tubular seat element (60). Metal-to-metal sealing elements (80) are disposed between the tubular seat and the valve body to develop an axial force in one direction when energized. A wedge element (39) acts on the ball element to energize the metal-to-metal sealing elements and provide a rotation stop for the ball element. The ball element is truncated and attachable to a drive member (94) which allows for shift of the ball element in open and closed positions. Metal-to-metal seals (112, 132) are provided throughout the valve.</p> |
