ZYHDP and ZYHDM electric precision single seat regulating valves, as well as electric precision small sleeve regulating valves, are the execution units in DKZ type electric unit combination instruments. They are important links in the automatic regulation of the production process. Electric precision small single seat regulating valves and electric precision small sleeve regulating valves receive a unified standard signal of 0-10 or 4-20mADC powered by a power source. The electric regulating valve converts this into automatic regulation corresponding to the input signal. Therefore, it is widely used for automatic regulation and remote control of industrial production processes such as chemical, petroleum, metallurgy, power plants, and textiles. The electric precision small single seat and sleeve regulating valves manufactured by Shanghai Yihuan Fluid Equipment Co., Ltd. come in various varieties such as standard type, corrugated pipe sealing type, jacket insulation type, etc. The nominal pressure levels of the product are 1.6, 4.0, and 6.4 Mpa; The nominal diameter range is DN20-400.