ACTUATOR APPARATUS WITH INTERNAL TUBING AND ANTI-ROTATION MECHANISM

Fluid valve actuator apparatus having internal tubing and anti-rotation features are disclosed. An example actuator apparatus includes a diaphragm plate defining a first pressure chamber and a second pressure chamber opposite the first pressure chamber, a first internal fluid passageway in fluid communication with atmosphere, and a second internal fluid passageway to receive a control fluid from a controller. The example apparatus also includes a tube fluidly coupling the first or second internal fluid passageway to the first pressure chamber via an opening in the diaphragm plate, where a first center axis of the tube is offset from a second center axis of the diaphragm plate, and where the tube passing through the diaphragm plate is to prevent the diaphragm plate from rotating. The example actuator apparatus also includes an adjustable spring seat in contact with a spring at a first end of the spring, where the spring is in contact with the diaphragm plate at a second end of the spring opposite the first end.