Double-acting piston pneumatic actuators mainly include cylinder, end cover and piston. gear shaft. Limit blocks, adjusting screws, indicators and other components. Compressed air is used as the power to propel the piston. The rack on the piston drives the gear shaft to rotate 90 degrees, and then drives the ball valve to open and close.
The single-acting piston pneumatic actuator mainly adds a return spring between the piston and the end cover, which can rely on the driving force of the spring to reset the ball valve and maintain the open or closed position to ensure the safety of the process system. Therefore, when selecting a single-acting cylinder, it is necessary to choose whether the ball valve is normally open or normally closed.
At present, the main types of cylinders are GT cylinders, AT cylinders, AW cylinders, etc.
GT appeared earlier, AT is an improved version of GT and is now a mainstream product. It can install the ball valve without bracket, which is faster, more convenient and stronger than bracket installation. The 0 and 90 positions are adjustable for easy installation of various solenoid valves, travel switches and handwheel mechanism accessories. AW cylinder is mainly used for large-diameter ball valve, with large output force, and adopts piston fork structure.
