Pneumatic control valve pneumatic digital circuit and display of energy supply

Pneumatic pneumatic control valve is always under the influence of processing error ( Such as concentricity, roundness, gradient, etc. ) , the sealing effect is not ideal. This kind of valve leakage rate is usually 10 - 4, after precision grinding can be up to 10 - 6, can achieve good sealing. Pneumatic pneumatic regulator power supply part supply energy, the whole circuit includes analog circuit, digital circuit and display of energy supply. In order to realize the remote control valve open read, pneumatic pneumatic regulator valve opening information needs to be transmitted to other control instrument, at the same time control instrument table can set for a valve opening from a far country, and system requires 1 road 4 ~ 20 ma analog input signal and 1 ~ 2 road 4 ~ 20 ma analog output signal.