Shut-off valve for liquid or gaseous media

Shut-off valve for liquid or gaseous media, having a valve housing which has at least one passage opening which connects an inlet opening to an outlet opening, having a valve seat arranged on the valve housing and enclosing the passage hole, said valve seat being able to be closed by a directly adjacent valve closing member, which are arranged in a regulation space formed in the valve housing between the inlet opening and the outlet opening, having a drive that is able to be attached to the valve housing, said drive actuating the valve closing member for opening or closing the passage hole, and having a restoring element which counteracts a closing or opening movement of the valve closing member, wherein,

• the drive has at least one setting element made from a shape memory alloy for controlling the opening or closing movement of the valve-closing element, and
• the drive is arranged to be separated from the regulation space by a sealing element, and wherein
• the valve housing has a sleeve-like housing section in which the inlet opening is provided and which encloses the passage hole, and the sealing element is arranged on the end of the sleeve-like housing section of the valve housing opposite the passage hole and closes the regulation space.