| 摘要 |
<p>The valve control (10) has a valve which comprises a valve disc (18) and a valve stem (22) that is movable in an actuation direction to open and close one of the openings. A fixing device is adapted to fix the valve stem relative to a cylinder head (14). A spring unit for is configured for preloading valve in an end position. A movable insert (34) moves in the cylinder head and supports the spring unit for preloading the valve. An actuation device moves the insert in the actuation direction between an end position near the valve disc and an end position that is remote from the valve disc.</p> |
