The SI-C ball valve is designed as a ball valve with a swivelling plug-in socket and a screwed-in connection piece. 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 safety locking handle, both one-sided locking in the closed position and two-sided fixation of the positions can be achieved. Also available with locking capability.