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Pneumatic watt adjusts position by converting air pressure into linear or rotary . Linear devices open and close gate, globe, diaphragm, pinch and angle-style with a sliding stem that controls the position of the closure element. Rotary devices move ball, plug and butterfly a quarter-turn (90°) or more from open to close. There are several actuation methods for pneumatic actuated . Diaphragm actuators are used mainly with linear , but are suitable for rotary when used with some type of linear-to-rotary linkage. Piston cylinder actuators are suitable for both linear and rotary . Typically, rack- and-pinion actuators are used to transfer the linear of a piston cylinder actuator to rotary . Rack-and-pinion designs are also suitable for adjusting manually-operated . Scotch yoke devices are used to transfer linear to rotary . By contrast, vane actuators are suitable only for rotary . Link and lever actuators attach a splined or slotted lever to the shaft in order to transfer the linear of diaphragm or piston cylinder actuators to rotary . The directional fundamentals pneumatic are power-operated devices used to modify fluid flow or pressure rate in a process system. These are used throughout industry in many applications. Actuated control pneumatic types include globe, diaphragm, pinch, knife or gate, needle, butterfly, ball, and plug. Another range of is the pneumatic steam which has the great working ability and thus proves to be the best product in the market.