First, the AT pneumatic actuator Product Overview
 AT new rack and pinion pneumatic actuator combines the latest technology at home and abroad, through CAD three-dimensional model innovation and design, compact appearance, modern styling; and the use of new materials, new technology, Product quality, more reliable performance; more selection of more affordable specifications; products fully meet the latest international standards and technical specifications to meet current and future needs. 
 
 Second, the AT pneumatic actuator Features
 1, double-piston rack and pinion symmetrical structure design, fast and smooth movements, high precision, high output power, by simply changing the piston assembly position can be obtained in the opposite direction of rotation. 
 2, Extruded high-quality aluminum alloy cylinder body, hard-anodized (in special case, anodized + Teflon coating) with precision machined bore hole and external surface, longer service life and lower friction coefficient. 
 3, one-piece design, all double-acting and single-acting actuator models, have the same cylinder block and end cover, it is convenient by adding spring or remove the spring to change the mode of action. 
 4, combined pre-charged safety spring group, either in the assembly process or the use of the scene, can be convenient and safe installation or increase or decrease the number of springs. 
 5, two separate side of the external adjustment screw has been installed on the valve actuator is more precise and convenient, open and valve control valve position, if the need for full stroke adjustment while the other end cap is also equipped with a longer adjustment screw . 
 6, Multi-function position indicator, visual indication on site, acc. To VID / VIE3845, NAMUR standard slot, can install and output all accessories, such as limit switch box, electrical positioner and position sensor (Beckhoff, Turck). 
 7, Gas source interface with NRMAR standard, can be directly installed NUMAR standard solenoid valve. 
 8, the back of the rack of composite materials bearing and piston ring and the output shaft bearings, etc. In order to prevent metal to metal friction, and increase lubrication, so that low friction and long life. 
 9, all fasteners are made of stainless steel, long-term anti-corrosion.
 10, the connection part of the line with the new international standard ISO5211, DIN3337 (F03-F25) to make production and installation of interchangeability, versatility. 
   
   Third, the double-acting principle (ATD)
 

CCW:
 Air intake at port A. Compressed air overcomes spring force. Piston outward movement, the actuator output shaft counterclockwise rotation (0 ° → 90 °), B port exhaust; 
 actuator out of breath, the piston moves inward under the spring force, the actuator output shaft clockwise 90 ° → 0 °), A mouth exhaust. 
 
 CW:
 A port inlet, compressed air to overcome the spring force to promote outward movement of the piston, the actuator output shaft clockwise rotation (0 ° → 90 °), B port exhaust; 
 actuator vapors. Pistons in the spring force The actuator output shaft rotates counterclockwise (90 ° → 0 °) and the A port exhausts.

Fourth, single-acting working principle (ATE)
 

CCW:
 A port inlet, compressed air to promote the piston outward movement of the actuator output shaft counterclockwise rotation (0 ° → 90 °), B port exhaust. 
 B port intake, compressed air to promote piston inward movement, so that the actuator output shaft clockwise (90 ° → 0 °), A exhaust port. 
 
   CW:
 A port inlet, compressed air to promote the piston outward movement, so that the actuator output shaft clockwise (0 ° → 90 °), B exhaust port.

B port intake, compressed air to promote piston inward movement, so that the actuator output shaft counterclockwise rotation (90 ° → 0 °), A exhaust port. 
 
 Five, AT pneumatic actuator technical parameters