| 摘要 |
<p>The valve upper part has a sleeve-like valve block (1) and a rotative stem (2) having a plug-in head (20) that crosses the middle of the valve block. The stem (2) has outer ring surfaces (23) interrupted by grooves (28). The valve block (1) is provided with a ring-shaped recess (17) on the inner edge facing the plug-in head (20). An essentially sleeve-shaped bearing (4) with limited elasticity is pre-stressed in the recess (17), pressed against one ring-shaped surface (23) of the stem (2) and in snap-in engagement with one of the grooves (28).</p> |
