| 摘要 |
<p>The core has a core body (11) made of a metal having a hardness differing from a hardness of a throughbore inner wall and a moving shaft. The body has a body positioning abutment (15) to abut the wall for providing a metal seal for a gap between the wall and bodys outer face. A plug (55) has an abutting taper to abut an inner edge of a bodys distal opening for providing a metal seal for a gap between the plug and opening.</p> |
