General:
ZDL-21000/41000 Series electric control valve includes ZDL-21000 series electric single-seated control valve and ZDL-41000 series electric cage
guide control valve ( the following is called electric control valve for short). The electric control valve takes power supply as the driving force, receiving
the D.C. control signal from 4—20mA, automatically changes the opening of the valve, so as to attain the adjusting of the technological parameters
for pressure, temperature, flow, liquid level, etc. Widely used in power station, metallurgy, petroleum-chemical industry, light industry and some other
industries in the automatic control system.

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