The HBSK-C and SIBK-C ball valves are designed as compact ball valves with a fixed plug-in socket integrated into the housing and a screwed-in connector. The stem is blow-out proof and mounted from the outside. The plug-in socket/plug-in nipple connection variant allows for quick installation in corresponding high-pressure piping systems. With the optional safety locking handle (SIBK-C), both one-sided locking in the closed position and two-sided fixation of the positions can be achieved. Also available with a locking device.