Hand operated valve lock device, especially for commercial vehicle parking brake valve

Locking device (1) comprises a button-operated slide (3) having at least one lockable end position and acting on a valve organ. A locking and releasing sleeve (15) is positioned relative to the operating button (7) of the valve connected to the slide. The locking and releasing sleeve surrounds locking members (11) guided on a fixed part (housing (5)). The locking members act on locking profiles located on the outer periphery of the slide.