What is an actuator yoke?
A scotch yoke actuator may be defined as a mechanical device that converts linear force into torque to motorise quarter-turn valves. A single-acting scotch yoke actuator is made of three main components: housing containing the yoke mechanism, pressure cylinder containing the piston and spring enclosure.
What does a valve actuator do?
Electric valve actuators control the opening and closing of valves. They can provide either linear or rotary motion and work with different types of valves, including ball and butterfly valves.
Where is Scotch yoke used?
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.
Which actuator gives rotary motion?
A rotary actuator is an actuator that produces a rotary motion or torque. The simplest actuator is purely mechanical, where linear motion in one direction gives rise to rotation. The most common actuators are electrically powered; others may be powered pneumatically or hydraulically, or use energy stored in springs.
Where is the yoke on a valve?
The Yoke is a clamp-type mounting which is placed over the tank valve and then secured with a screw to hold it in place.
What is the difference between Din and yoke?
First, what is the difference between them? The yoke is a clamp-type mounting, which is placed over the tank valve and then tightened into place. The DIN is a threaded valve, wherein you screw the regulator into the tank valve. On the DIN, it is placed on the regulator first stage.
What is a scotch yoke actuator?
Scotch Yoke actuators are designed for use over a wide range of pressures or temperatures. The scotch yoke mechanism is available in symmetric design to meet application specific valve torque demand requirements with minimum cost and weight. Scotch Yoke actuators are provided with modular design.
What is a flat yoke®?
By incorporating the patented Flat Yoke ® actuator mechanism, higher torque outputs are offered in a weight and force balanced design. The longer yoke arms of the Flat Yoke design allow the advantageous canted yoke torque curve simply by choosing a different travel stop setting.
What is a scotch yoke valve?
The Scotch Yoke mechanism are manufactured in many different model number combinations of actuator sizes, cylinder diameters, and double or spring return action are available for installation on ¼ turn valves. Scotch Yoke actuators are designed for use over a wide range of pressures or temperatures.
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: