| 摘要 |
<p>PCT No. PCT/DE93/00488 Sec. 371 Date Mar. 14, 1994 Sec. 102(e) Date Mar. 14, 1994 PCT Filed Jun. 5, 1993 PCT Pub. No. WO94/02763 PCT Pub. Date Feb. 3, 1994.The valve upper part has a head piece (1), a spindle (2) and a valve piston (3). The valve piston (3) can move axially in the head piece (1). The spindle (2) can rotate in the head piece (1). Spindle (2) and valve piston (3) are connected together via a movement thread (24, 32). The movement of the valve piston (3) in the axial direction is limited by a stop arranged internally on the head piece (1) and arranged externally on the spindle (2) in the same cross-sectional plane. For axial location, the valve piston (3) and the head piece (1) each have a polyhedron (31; 14) which is formed by teeth which are triangular in cross-section and which interlink. When the valve piston (3) is closed the sealing is hydrostatic by means of a sealing ring (42) retained in the head piece (1).</p> |
