Pipeline pneumatic valve need to adopt high torque drive

due to high pressure, large diameter pipeline conveying, fast switching time, the pipeline pneumatic valve need to adopt high torque drive. Such as electric or pneumatic device linkage or electric, gas - liquid - liquid linkage. Driving devices have explosion-proof requirements, ask EExdIIBT, IP protection grade. Because of management control in station or central control room, so the major accidents such as piping in the event of rupture, pipeline pneumatic valve can automatically cut off. Pipeline pneumatic valves require work force is small, changes in temperature, external force effect, can realize accurate operation. Emergency cut-off pneumatic valve, in particular, must be able to in the fully open position for a long time, rapid closure line when necessary. At the same time, the requirement of pneumatic valve opening and closing and opening indicator accurately, to understand and meet the appropriate switching speed.