ZYHDP and ZYHDN electric straight through single seat regulating valves and electric straight through double seat regulating valves are the execution units in the DKZ electric unit combination instrument. Electric straight through single seat regulating valves and electric straight through double seat regulating valves are important components of the automatic control system in the production process. The electric control valve is powered by a power source and receives a unified standard signal of 0-10 or 4-20mADC. Convert this into the corresponding up and down displacement of the input signal, automatically operate the valve, change the opening degree of the valve, thereby achieving automatic adjustment of parameters such as industrial medium flow rate, pressure, temperature, and hydraulic pressure. Therefore, electric through single seat regulating valves and electric through double seat regulating valves are widely used in automatic regulation and remote control of industrial production processes such as chemical, petroleum, metallurgical, power station, and textile industries. The electric straight through single seat regulating valve and electric straight through double seat regulating valve manufactured by Shanghai Yihuan Fluid Control Equipment Co., Ltd. have various varieties such as standard type, corrugated pipe sealing type, jacket insulation type, etc. The nominal pressure rating of the product includes PN16, 40, and 64; The nominal diameter range is DN20-400.