Compressed-air device for controlling valves

A compressed-air device for controlling valves, comprising:

• in a longitudinal direction, a first vane-type rotary cylinder having a front face as well as a back face, said front face being provided with a rotatable head, and a second vane-type rotary cylinder having a front face and a back face, said first and second cylinders each being supplied with compressed air by means of a compressed air valve connected to two ports on each of said first and second cylinders,
• said first vane-type rotary cylinder being arranged to rotate said valve to be controlled between a first predetermined position and a second predetermined position in a single motion, said back face of said first cylinder comprising a rotating disc provided with stationary edges,
• said second cylinder being arranged to describe an angle from a first predetermined position to a second predetermined position in a single motion and comprising, on its front face, a rotating disc provided with a stop, said second cylinder further having a torque greater than that of said first cylinder, and
• said first and second cylinders being connected to each other by mutual interlocking, said stop of said rotary disc of said second cylinder being arranged to be inserted between said stationary edges of said first cylinder and further having a width arranged to allow the stationary edges of said rotary disc of said first cylinder perform a predetermined rotation before being blocked by said stop.