In nearly every industry, scotch yoke actuators are commonly employed to actuate quarter-turn valves. The basic mechanism converts linear force into quarter-turn torque in a manner that suits most valve types, but especially larger valves. The relative simplicity of the design typically allows a lower cost per unit of end-of-stroke torque. In this article, we discuss the mechanism, how and why it produces torque, and the torque characteristic achieved.
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