Abstract: The ZDYZ 22/80 electro-hydraulic actuator, newly trial-manufactured with some foreign accessories as well as with the power fail interrupt protection function for the hydraulic pressure system, realizes the integration of servo-amplifier and actuator. The ZDYR--100 electro-hydraulic regulating valve modified with the actuator increases reliability and operating properties, which is selectable domestic equipment to be used in old/new pipeline with the tight line process.