| 摘要 |
PCT No. PCT/DE91/00472 Sec. 371 Date Apr. 9, 1992 Sec. 102(e) Date Apr. 9, 1992 PCT Filed Jun. 5, 1991 PCT Pub. No. WO92/03673 PCT Pub. Date Mar. 5, 1992.An axially movable valve piston (3) and a rotatable spindle (2), which are connected with one another via a thread (24; 32), are guided in a headpiece (1). A sealing ring (5), which projects beyond the end face of the headpiece (1) facing the suppy duct, is held by the headpiece (1). The sealing ring (5) is designed on the projecting outer end face as a surface (54) for resting against a valve seat (62) and on the opposite inner end face as a lip seal (52) cooperating with the valve piston (3). In its section cooperating with the lip seal (52), the valve piston (3) is designed in a flat and seal-free manner.
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