The working principle of the pneumatic actuators

The working principle of pneumatic actuator
in the gear level, the speed of the engine by two sets of gear transmission on the output shaft. Lord done by planetary gear speed reducer, deputy implemented by worm gear speed reducer, it is a tension spring is fixed in a central location. In the event of overload of cases, that is, the output than the spring setting torque, the worm gear axial displacement happens, fine-tuning, switch and signal device for for the system to provide protection.
pneumatic actuator to control lever manipulation by external change coupling effect, the output shaft with worm gear coupling, when engine working in manual operation with handwheel coupling. When the engine does not work, can be easily broken motor drive, and only need to press the control rod is connected the handwheel. Because motor driven in preference to manual operation, when the engine starts, again will happen automatically reverse action. So you can avoid also open the handwheel when when the engine is running, is advantageous to the protection system.
the handwheel directly with the output shaft coupling, so it can guarantee the normal internal gear failure or damage to the valve manually.
installed on the gear switch and signal device is a sealed enclosure, to protect the internal components to achieve the following functions:

local or remote display the valve position of the actuators/valves overload protection
delimits the scope of the valve stroke

electrical interface pneumatic actuators on the different type valve installation is done through the output shaft, it can be applied to existing stem configuration.