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Understanding mechanical limitations of linear actuators

In many cases it is essential to understand the mechanical limitations of an actuator to successfully apply linear-motion devices. The following information provides an overview to help in understanding the nuances and limitations of linear actuators. Accuracy needs to be considered from two perspectives. First is the accuracy of the actuator itself. This relates to the actuator's moving-element ability to travel in an ideal single-axis path or straight line. This is primarily a function of the base or cylinder tube and the bearing or guidance
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Linear Actuators
Electric linear actuators have an output rod that provides linear motion via a motor driven ball screw, lead screw, or ACME screw assembly. The actuator's load is attached to the end of a screw or rod and is often unsupported.
Pneumatic Valve Actuators
Pneumatic valve actuators adjust valve position by converting air pressure into linear or rotary motion.
Valve Actuators
Valve actuators mount on valves and, in response to a signal, move a valve to a desired position using an outside power source.
Electrohydraulic Valve Actuators and Hydraulic Valve Actuators
Electrohydraulic valve actuators and hydraulic valve actuators convert fluid pressure supply pressure into motion.
Globe Valves
Globe valves are linear motion valves with rounded bodies, from which their name is derived.  They are widely used in industry to regulate fluid flow in both on/off and throttling service. 
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