Pneumatic Actuators - MDHSRobotics/TeamWiki GitHub Wiki
Pneumatic Control Valve Actuator
Actuators are used to frequently open and close valves in a compressed system
Converts energy typically in the form of compressed air into mechanical motion
This motion can be rotary or linear
Types
Piston
Piston style actuators generate linear force by the air acting on the piston. The conversion of this linear force to torque (for use in rotary valves) is achieved by specific actuator designs.
Scotch Yoke
A scotch-yoke actuator includes a piston, connecting shaft, yoke, and rotary pin. The yoke is offset 45 degrees from the axis of the piston at the two ends of travel and at 90 degrees to the piston shaft when in the mid travel position. The canted scotch-yoke design is ideal for offset butterfly valve actuation.
Rack and Pinion
Unlike traditional actuators, which produce a 90-degree turn of the pinion, rack, and pinion, actuators output a 180-degree turn. This style of actuator is particularly suitable for actuating plug valves.
Diaphragm Style
The diaphragm-style actuator includes a rubber diaphragm and stem in a circular steel housing. This style of actuators is ideal for valves requiring shorter travel, such as diaphragm valves and globe valves.