A stroke control valve actuators parts by travel agencies and the opening direction control agency, whose features are: opening indication mechanism using a worm gear, which consists of the worm shaft, worm gear, worm shaft, potentiometers, coupling , a pointer and dial into resistance, potentiometers, pointer and worm coaxial fixed connection (referred to as solid-linking). Micro-switch is an electric device control components. Existing stroke controller, in opening indication short drive chain and travel agencies to control both high accuracy while not yet reached the degree of opening of the utility model indicating mechanism using a worm gear, pointer, potentiometers and worm coaxial solid joint stroke control mechanism adopts worm-type or counter-style, to solve the above problems. The utility model can be used for Z-type or Q-type valve actuators. HWK-22A series switch for electric valve drive device and a variety of automation and control circuit is used as the mechanical signals into electrical signals only. WK3-1, HWK-11, HWK-11A, HWK-22A, MK2-1, MK2-2, HWK-22A trip micro switch: HWK-22A trip switch for electric valve actuators as well as a variety of automated control circuit used as the mechanical signals into electrical signals only.