gear controller ( Sometimes also called gear box) , use high gear converts the handwheel torque output of the thrust, the thrust should be more than the larger flow t and higher thrust pressure needed. Linear motion using spur gear and bevel gear gear box. The rotary motion is using rack and gear box Gear or worm gear. Gear box used between the gear ratio of 7:1 and 3:1. Using the handwheel and crankshaft gear. Gear box protective gear, it is not only to protect personnel from near the running gear, but also reduce the contact with the atmosphere or the external environment. Gear normal bolting valve or some 1/4 - in straight line Rotary valve bonnet or bonnet cover, or connect to the butterfly Industrial Valves or ball valve on the valve body. For linear motion valve, the valve stem with threaded connection directly to the rod of the controller. For the rotation valve, the shaft end can slot or square groove, and can be embedded in internal opening of gears in the gear. When Marine valve installed on the pipeline, there is no certain types of valve position indicator is a quantity is difficult to determine. Most controller with position indicator, which is composed of cylinder head and the corresponding positioning plate, the representation of a positioning plate valve position. Most common actuator is driven by pneumatic actuators, because power is compressed air, it is compared with the human resources or electric or hydraulic power is relatively cheap. For this reason, now almost 90% of all operations of the actuator is driven by compressed air. Compared with the electric machinery and electric hydraulic actuators, pneumatic actuators are relatively cheap and easy to master and maintain. Many corresponding to the maximum thrust due to size of the standard product is available in active service. Special conditions of actuators using special engineering products, such as some conditions require special long stroke, high stroke speed or harsh temperature. By the maintenance point of view, pneumatic actuators than other types of actuators are easy to operate and the calibration of the. Some pneumatic actuators are designed field convertible model, mean potato does not require special tools or maintenance activities at the scene can make them by air Extends into the air a contraction ( And vice versa) 。 Although not as powerful as hydraulic actuators, pneumatic actuators are still able to generate considerable thrust to adapt many, including high pressure and high pressure drop, many conditions. Despite the air pipeline is not easy to install, but its cost is installed cable ducts and power lines and hydraulic hoses for less. Pneumatic actuators will be compressed air emissions into the atmosphere, compared with the hydraulic and more environmentally safe. When actuator using pneumatic positioner, it is ideal for flammable and explosive environment, because they don't use signals or power, and telecommunication number if not prevent Ye or intrinsically safe has the potential danger of fire caused by the flames.

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