How does a scotch yoke actuator work?
A scotch yoke actuator typically consists of a crank and piston system in a hollow cylinder. Pressure is applied to a side of the piston inside the cylinder. As a result, force is generated which moves the piston along the axis of the cylinder to rotate the actuator stem 90° with pilot air application.
How does a rack and pinion actuator work?
In a pneumatic rack-and-pinion actuator, the linear force of a piston driven by compressed air is converted to rotational torque via a rack-and-pinion gear mechanism. A rack-and-pinion, as shown in Figure 2, consists of a circular gear, the pinion, engaged in a linear gear, the rack.
What causes actuators to fail?
Normally, failure is caused by application errors, such as side loading, incorrect wiring, poor mounting fixity, excessive loading, and exceeding duty cycle.
Where can we use Scotch yoke mechanism?
The Scotch yoke mechanism is most commonly used in control valve actuators in high-pressure oil and gas pipelines, as well as in various internal combustion engines, such as the Bourke engine, SyTech engine and many hot air engines and steam engines. This mechanism does not create lateral forces on the piston.
Is a stepper motor a rotary actuator?
The linear actuator transforms the rotary motion into linear motion. The stepper motor provides rotary power to the actuator. This helps achieve high accuracy and resolution in applications, where precision motion is desired.
What is a scotch yoke valve actuator?
Cowan’s Scotch Yoke Valve Actuator has a modular design that allows customization to fit specific needs. Complete the form to get a quote within 24hrs. Our Series CSY Scotch Yoke Actuator is compatible with any process valve that requires rotary motion. Cowan valve mounting kits for our Scotch Yoke Actuator can be designed for any rotary valve.
Can I get a custom color for my scotch yoke actuator?
*Custom Colors Shown: Custom colors available upon request. Max-Air Technology Heavy Duty Series (HD) Scotch Yoke Actuators are available in two distinct configurations: SHD (symmetric) and CHD (canted) heavy duty selectable torque profiles are designed to perform in the most demanding applications based on valve requirement.
Which actuator is best for your application?
Deciding which actuator is best for a certain application depends on several factors like environment, required accuracy, and close/open speed. A scotch yoke valve actuator is engineered to automate all types of quarter-turn valves (butterfly, ball, plug, and damper) with various torque profiles to provide a “best fit” for every application.
What is the difference between 90˚ and rack&pinion actuators?
When choosing between a 90˚ actuator such as a Rack & Pinion or Scotch Yoke, the main difference between these actuators are the torques they can generate. The following table shows the difference between the two main types of 90˚ actuators: