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An idle air control actuator or idle air control valve (IAC actuator/valve) is a device commonly used in fuel-injected vehicles to control the engine's idling rotational speed . [1] In carburetted vehicles a similar device known as an idle speed control actuator is used.
Similarly, three-stage servo valves may use an intermediate stage spool valve to position a larger third stage spool valve. Three-stage servo valves are limited to very high power applications, where significant flows are required. Furthermore, two-stage servo valves may be classified by the type of feedback used for the second stage; which may ...
[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
Moog also worked on several space contracts and designed part of the liquid rocket engine propulsion systems on the Voyager space probes and provided thruster valves that steered the spacecraft. Moog also made servo-actuators for four Space Shuttles. Moog provided a control and motion system for the Wimbledon Centre Court retracting roof. This ...
Pneumatic actuator operating a valve through a rack-and-pinion mechanism. [7] A pneumatic actuator is similar to a hydraulic one but uses a gas (usually air) instead of a liquid. [8] [9] Compared to hydraulic actuators, pneumatic ones are less complicated because they do not need pipes for the return and recycling of the working fluid. On the ...
The difference in pressure between the two air chambers creates what is known as the air metering force, which acts to open the servo valve. Chamber C contains metered fuel, and chamber D contains unmetered fuel. The difference in pressure between the two fuel chambers creates the fuel metering force, which acts to close the servo valve. Since ...
A control valve is a valve used to control fluid flow by varying the size of the flow passage as directed by a signal from a controller. [1] This enables the direct control of flow rate and the consequential control of process quantities such as pressure, temperature, and liquid level.
The air metering force from chambers A and B is opposed by the fuel metering force from chambers C and D. These two forces combine into movement of the servo valve to adjust the fuel flow to the precise amount required for the needs of the engine, and the needs of the pilot. [14]
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