How to choose pneumatic actuator type

the pneumatic actuator is a type of actuator. Categorizing pneumatic actuator has two types: one is single, another is called dual role. These two differences is above the closing action, double effect at the time of clearance action is to perform an action by air, and single function is using spring return. The similarities of the two is that it is the open action is done with gas source to perform the action. On two types of pneumatic actuators to choose, there is a pneumatic mechanism type selection of the resources, the user can view selection, to see their own production facilities are suitable for which one, to make a correct choice. When selecting a source of pneumatic actuators to consider the following factors: safety factor, size of the actuator, the occasion of use. When choose pneumatic actuators, don't forget to several of these factors.