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2. Pneumatic actuator - Wikipedia

   en.wikipedia.org/wiki/Pneumatic_actuator

   Pneumatic rack and pinion actuators for valve controls of water pipes. A pneumatic actuator mainly consists of a piston or a diaphragm which develops the motive power. It keeps the air in the upper portion of the cylinder, allowing air pressure to force the diaphragm or piston to move the valve stem or rotate the valve control element.

3. Clutch - Wikipedia

   en.wikipedia.org/wiki/Clutch

   Clutch. A clutch is a mechanical device that allows an output shaft to be disconnected from a rotating input shaft. [ 1] The clutch's input shaft is typically attached to a motor, while the clutch's output shaft is connected to the mechanism that does the work . In a motor vehicle, the clutch acts as a mechanical linkage between the engine and ...

4. Valve actuator - Wikipedia

   en.wikipedia.org/wiki/Valve_actuator

   Air (or other gas) pressure is the power source for pneumatic valve actuators. [1] They are used on linear or quarter-turn valves. Air pressure acts on a piston or bellows diaphragm creating linear force on a valve stem. Alternatively, a quarter-turn vane-type actuator produces torque to provide rotary motion to operate a quarter-turn valve.

5. Linear actuator - Wikipedia

   en.wikipedia.org/wiki/Linear_actuator

   DVD drive with leadscrew and stepper motor. Floppy disc drive with leadscrew and stepper motor. A linear actuator is an actuator that creates linear motion (i.e., in a straight line), in contrast to the circular motion of a conventional electric motor. Linear actuators are used in machine tools and industrial machinery, in computer peripherals ...

6. Boeing 737 rudder issues - Wikipedia

   en.wikipedia.org/wiki/Boeing_737_rudder_issues

   [2]: 13 Inside the PCU is a dual servo valve that, based on input from the pilot's rudder pedals or the aircraft's yaw damper system, directs the flow of hydraulic fluid in order to move the rudder. [2]: 19 The PCU for affected Boeing 737 aircraft was designed by Boeing and manufactured by Parker Hannifin. [2]: 20

7. Damper (flow) - Wikipedia

   en.wikipedia.org/wiki/Damper_(flow)

   Damper (flow) Opposed blade dampers in a mixing duct. A damper is a valve or plate that stops or regulates the flow of air inside a duct, chimney, VAV box, air handler, or other air-handling equipment. A damper may be used to cut off central air conditioning (heating or cooling) to an unused room, or to regulate it for room-by-room temperature ...