| 摘要 |
Valve-actuating device, in particular in a pneumatic reversing valve, for admitting pressure to working cylinders belonging to door-closing systems and having closing and opening chambers. The valve is mechanically connected to an electric motor in such a way that its output variable, converted via intermediate gearing means into a linear adjusting movement, displaces the valve slide in each case into a different end-stop position as a function of the polarity of the supply voltage activating the electric motor. This results in a bistable character inherent in the entire switching arrangement of electric motor and reversing valve so that complicated mechanical means (switching levers and the like) ensuring a bistable switching behaviour of a door valve can be dispensed with. <IMAGE> |
