Scotch Yoke or Rack-and-Pinion Pneumatic Quarter-Turn Actuator?

In this insightful and thorough discussion on the Scotch Yoke and Rack-and-Pinion Quarter-Turn actuators, German valve expert, Günter Öxler, describes the different technical solutions offered by pneumatic actuators. With vivid images, charts and diagrams, Öxler explains the benefits and appropriate uses of both types of pneumatic control solutions.