Screw locking device for blocking the rotation of a screw element

A locking sleeve (5) encloses a screw-in part and can be fixed in the direction of rotation for an inner thread (22) regarding a component. There are recesses (16) on the crew-in part, into which the locking sleeve can be molded. On its end area facing a valve body a screw-in thread formed on a pressure pipe support forms an outer thread (20) and engages in a thread that forms an inner thread (22) on the wall of a retaining opening (18) on the valve body.