Pneumatic valve actuators adjust valve position by converting air pressure into linear or rotary motion. There are two main forms: the piston actuators and diaphragm actuators. Piston actuators are ...

There are four basic types of valve positioners: pneumatic, electronic, electro-pneumatic, and digital. Pneumatic devices send and receive pneumatic signals. They are intrinsically safe and can ...

Develop a standard or standard(s) for valve positioner evaluation and performance criteria. Positioners may accept pneumatic or electric, or other inputs. Outputs may be pneumatic, or other, to ...