More About Pneumatic Valve Actuators
Pneumatic actuators are used to provide mechanical motion using compressed air. They consist of a piston, cylinder, and valves (or ports) and can convert applied energy into linear or rotary motion. They can either be single acting (spring) and double-acting, depending on the number of inlet ports that control the piston’s movement. Pneumatic actuators have diverse applications, including combustible engines, air compressors, railways, manufacturing, and aviation.
Types of Pneumatic Actuators:
- Rotary Actuators - the most basic type of pneumatic actuator, which uses standard rotational motion using compressed air.
- Tie-Rod Actuators - use high-strength threaded rods to support the cylinder barrel as pressure is delivered to the system to move the piston.
- Gripper Actuators - finger-like objects that offer parallel or angular motion to transport objects.
- Vacuum Actuators - attached components are delivered using compressed air into a usable vacuum, which can be used to provide suction.
- Rodless Actuators - pistons are moved using a rack and pinion system instead of physical rods.
Pneumatic Actuator Important Considerations:
- Actuation Features - the type of actuation action will also determine the failure mode in case of loss of hydraulic pressure.
- Output Torque - the amount of rotational force applied to both electric and fluid actuators
- Maximum Holding Force - the quality of linear actuators that describes the thrust
- Maximum Speed - highest rotational speed delivered by powered actuators
- Enclosure Protection Rating - NEMA or IEC-rated enclosures