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Electrohydraulic servo valves may consist of one or more stages. A single-stage servo valve uses a torque motor to directly position a spool valve. Single-stage servo valves suffer from limitations in flow capability and stability due to torque motor power requirements.
Electro-hydraulic actuators (EHAs), replace hydraulic systems with self-contained actuators operated solely by electrical power. EHAs eliminate the need for separate hydraulic pumps and tubing, because they include their own pump, [ 1 ] simplifying system architectures and improving safety and reliability.
In April 1950 Bill Moog (cousin of Robert Moog, inventor of the Moog synthesizer) applied for a patent for the electrohydraulic servo valve (later called a "Moog Valve"), a device to control hydraulic pressure for fine control of actuators. The US patent 2625136 was issued in January 1953.
Another approach is an electrohydraulic actuator, where the electric motor remains the prime mover but provides torque to operate a hydraulic accumulator that is then used to transmit actuation force in much the same way that diesel engine/hydraulics are typically used in heavy equipment.
Pages in category "Valves" The following 71 pages are in this category, out of 71 total. ... Electrohydraulic servo valve; Endobronchial valve; F. Faucet aerator;
Servomechanism, or servo, a device used to provide control of a desired operation through the use of feedback AI servo, an autofocus mode; Electrohydraulic servo valve, an electrically operated valve that controls how hydraulic fluid is ported to an actuator; Servo drive, a special electronic amplifier used to power electric servomechanisms
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