ROPO well-known professional manufacturer of pneumatic actuators and pneumatic/electric control valves, engineering in the actuator, control valves research and development for more than dozens of years, ROPO is one of the pioneers in the field of flow control valves around the world.ROPO company manufactures a wide range of part turn pneumatic actuator for quarter turn valve, which is powerful, reliable, long life and maintenance free, the new actuator generation with its compact and modern essential line. Its performing Rack ï¼Pinion rotary system is the best choice for butterfly and ball valves control.