Abstract: The invention relates to a shut-off valve comprising a valve housing (12), a valve piston with valve cone (22) arranged up-stream of an associated valve seat (20), and a piston holder (16) axially movable within the valve housing (14) by means of a spindle (58) and accommodating said valve piston. To prevent overtightening of the valve piston, the piston holder (16) is connected to the valve housing (14) in the manner of a slip clutch. In addition, the outlet port (146) of the shut-off valve can be closed by a non-return valve.

Abstract: In order to minimize wear and an over tightening effect in a shut-off valve (10) intended primarily for sanitation valves, which has a valve housing (12) a valve piston (16) that can be displaced axially by the operation of an element such as a handle (52) with a valve head (18) which can be lowered onto a valve seat (20) and raised from this and which is arranged upwards in the direction of flow relative to this, the valve piston is housed in a holding element (40) which can be displaced by means of a cylinder-shaped guide element (32) used to achieve the axial movement, which, with its (lower) edge area (36) is housed by the valve housing (12) and with the other (upper) edge area interacts with a further element (30) that holds the valve seat, in which connection the guide element together with the holding element can be rotated relative to the further element that contains the valve seat and to the valve housing (12) if the valve piston is located in its end position.