Valve cartridge

The invention relates to a valve cartridge having a head part (1, 1 '), which is centrally penetrated by a spindle (2, 2'), by means of which a valve can be actuated, which valve bears against a shoulder (15) formed by a reduction in the inner diameter of the head part (1, 1 '), the spindle (2, 2') being sealed against the head part via at least one O-ring. According to the invention, a reducing sleeve (5, 5 ') is introduced into the head part (1), which reducing sleeve is sealed with respect to the head part (1, 1') by means of a first O-ring (91), and the mandrel (2, 2 ') is sealed with respect to the reducing sleeve (5, 5') by means of a second O-ring (92). The invention further relates to a fitting having such a valve cartridge. 本发明涉及一种阀筒，带有头部件(1,1')，该头部件由心轴(2,2')在中心贯穿，通过该心轴可操纵阀，该阀贴靠在由头部件(1,1')的内径减小形成的凸肩(15)处，其中，心轴(2,2')经由至少一个O形环相对于头部件密封。在头部件(1)中引入有变径套(5,5')，该变径套经由第一O形环(91)相对于头部件(1,1')密封，其中，心轴(2,2')经由第二O形环(92)相对于变径套(5,5')密封。此外，本发明涉及一种带有这样的阀筒的配件。