Abstract: A ball valve includes a hollow valve body for mounting a valve ball therein. A drive transmitting stem has a proximate end coupled to the valve ball, and a distal end extending outwardly of the valve body for coupling with an output drive shaft of a valve control device. A hollow bearing housing of a single-piece construction is sleeved spacedly on the stem, and has a mounting end inserted into the valve body, and a support end for supporting securely the valve control device. An annular packing member, a tensioning member and a bearing member are mounted sealingly on the stem and are completely received in the bearing housing. As such, the ball valve can be connected directly to the valve control device through the bearing housing without the need for a connecting bracket.