The invention relates to a valve bonnet having a head piece (1) in which a spindle (2) is arranged and which rests on a disk guide (3) and engages, via a pin (28), a control disk (4) guided in the disk guide (3). Said control disk is in contact with a rotationally fixed passage disk (5) that has at least one passage opening (52). The spindle (2) has a spherical portion (23) on which the pin (28) is arranged, the spindle (2) being pretensioned in the closing direction of the control disk (4) by at least one spring element.