Control valve has coupling device operated hydraulically by control pressure and coupling piston guided in actuation shaft with control surface for engaging coupling and transfer elements

摘要

The valve has a valve body (4) movable by hand using an emergency control device (2). An actuation shaft can be connected via a coupling device (14) to a transfer element that interacts with the valve body. The coupling device can be operated hydraulically by a control pressure and has a coupling piston guided in the actuation shaft with a control surface by which the coupling element can be brought into engagement with the transfer element.