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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 ...
During World War II, Parker experienced a boom in business as the U.S. Air Force's primary supplier of valves and fluid connectors. [7] By 1943, the firm employed 5,000 Cleveland, Ohio, residents. After Arthur Parker's death in 1945 [10] and the end of the war, the company neared bankruptcy due to the sudden drop in demand.
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 ...
William Moog (August 15, 1915–1997) is known for inventing the electrohydraulic servo valve in 1951. [1] He founded Moog Inc., which makes actuators for aircraft. He was born in New Jersey. His cousin was Robert Moog, one of the leading pioneers of the modern synthesizer. Moog was married and had three daughters.
[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 .
The hydraulic circuit powers the actuators which then move the control surfaces. As the actuator moves, the servo valve is closed by a mechanical feedback linkage - one that stops movement of the control surface at the desired position. This arrangement was found in the older-designed jet transports and in some high-performance aircraft.