| 摘要 |
<p>The valve has a valve shell (2) which has at least one external spiral groove (46) round it. In this part of the shell, it has a co-axial drive shell (40) round it with an internal spiral groove (42). The two grooves are engaged via balls (48), forming the ball transmission (4) of a ball spindle drive (5). The drive shell can be rotated in the valve housing by a drive motor (30).</p> |
