| 摘要 |
The mask has an adjusting element i.e. pivotable lever arm, influencing pretension of a valve spring, and a disk element (22) i.e. flexible double strap, comprising two switching positions (24, 26). The disk element acts on the adjusting element during translatory motion of the disk element from one of the switching positions to another one of the switching positions, so that change of the pretension of the valve spring is obtained, and switching of the disk element takes place from a normal pressure operating mode to a high pressure operating mode. |
