Which master of automatic control instrument can read this drawing? Is the valve a pneumatic valve? How did the air supply pipe get into the instrument? What information can I get from reading this dr

Which master of automatic control instrument can read this drawing? Is the valve a pneumatic valve? How did the air supply pipe get into the instrument? What information can I get from reading this drawing? The valve must be pneumatic, and the gas source pipe enters the instrument because the instrument is also pneumatic.

Pneumatic transmitters and regulators have been eliminated, and it is estimated that there is no manufacturer to produce them at present. In 1970s and 1980s, pneumatic instruments were widely used in industrial measurement and control. At present, the transmitter has been replaced by electric III instrument, and the regulator has also been replaced by electric III regulator or DCS, PLC and other distributed control systems. However, pneumatic actuators (such as control valves) are still widely used in the control of chemical plants.

I am an instrument designer. A few days ago, several foreign projects required the use of pneumatic instruments. Because pneumatic instruments are not easy to sell, we gave up the project directly.