bd40bc7c7a Control. The valve will then deliver a measured amount of fluid power to an actuator. One such example is Honeywell's servo valve which is part of the fuel control mechanism for the CFM International CFM56 engine powering the Boeing 737NG and Airbus A320 passenger aircraft. The position transducer (LVDT) which is excited via an oscillator measures the position of the spool (actual value, position voltage). An electric command signal (flow rate set point) is applied to the integrated position controller which drives the pilot stage. description The requested resource is not available. message . Servo valves and servo-proportional valves are operated by transforming a changing analogue or digital input signal into a smooth set of movements in a hydraulic cylinder.
A low voltage is used to control the servo valve. The controller drives the pilot stage until the error between command signal and feedback signal will be zero. .. References. One example of servo valve use is in blow molding where the servo valve controls the wall thickness of extruded plastic making up the bottle or container by use of a deformable die. The mechanical feedback has been replaced by an electric feedback with a position transducer. Thus the position of the spool is proportional to the electric command signal.. Another example is the regulation of fuel flow into a turbofan engine governed by FADEC. An electrohydraulic servo valve (EHSV) is an electrically operated valve that controls how hydraulic fluid is ported to an actuator. The twin Moog servo valves are used to deform the shape of the die on this blow molding accessory designed by BMC Limited .