In 1917, the original patent for the nozzle-flapper system was applied for in Sweden by RagnAR CA<\/strong>rlstedt, after whom ARCA is named. The nozzle-flapper system forms the basis of the continuous pneumatic control of control valves<\/a>, which enables the optimal control and metering of gases and fluids in industrial processes. This innovation accelerated the industrial development of the entire industry and paved the way for completely new and significantly faster production processes in large-scale industrial plants.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n