d661valves-(moog伺服阀样本).pdf

CAUTION DISASSEMBLY, MAINTENANCE, OR REPAIR OTHER THAN IN ACCORDANCE WITH THE INSTRUCTIONS HEREIN OR OTHER SPECIFIC WRITTEN DIRECTIONS FROM MOOG WILL INVALIDATE MOOG’S OBLIGATIONS UNDER ITS WARRANTY. D661 Series ISO 4401 Size 05 Installation and Operation Instruction Servo and Proportional Control Valves with Integrated Electronics 1. INTRODUCTION This manual provides instructions and procedures necessary to install, operate and troubleshoot the Moog D661 Series Servo and Propor- tional Control Valves. 2. OPERATION General The Servovalves D661-G, S and H Series and the Proportional Flow Control Valves D661-P Series are throttle valves for 2-, 3- and 4-way applications. With proportional flow control valves, 5-way applications are also possible. These valves are suitable for electrohydraulic position, velocitiy, pressure or force control systems with high dynamic response requirements. D661-G, S and H The spool of the main stage is driven by a nozzle flapper or ServoJet® pilot stage, optional with or without additional mechanical feedback (nozzle flapper only). With versions D661-S and H in case of an electrical supply failure the spool is moved into a preferred position by action of an additional mechanical feedback. ELECTROHYDRAULIC VALVE CUT-AWAY Figure 1 Moog Series D661-G Series, without additional mechanical feedback X TAPBT2Y Connector Spool Bushing Screw Plug for Null Adjust Series Models Series GServovalve with nozzle-flapper or ServoJet® pilot stage, spool in bushing, without additional mechanical feedback Series SServovalve configured like version G, but with additional mechanical feedback Series HServovalve configured like version S, but with improved performance (high response) Series P.A/BProportional valve with ServoJet® pilot stage, spool in body, without additional mechanical feedback Series P.F/GProportional valve configured like version P.A/B, but with nozzle flapper pilot stage and additional mechanical feedback Jet pipe Annular area NozzleReceiver 2 Operating Principle of the Two-Stage Valve An electric input signal (flow rate command) is applied to the integrated control amplifier which drives a current through the coils of the pilot stage torque motor. Thus the deflected nozzle-flapper system produces a pressure difference across the drive areas of the spool and effects its movement. The position transducer which is excited via an oscillator measures the position of the spool (actual value, position voltage). This signal is then rectified by a demodulator and is fed back to the control amplifier where it is compared with the command signal. The control amplifier drives the torque motor until command voltage and feedback voltage are equal. Thus, the position of the spool is proportional to the electric command signal. Proportional Flow Control Valve D661-.P The nozzle flapper design of the pilot stage has been converted into an improved version with jet pipe amplifier (ServoJet®). The ServoJet® pilot stage consists mainly of torque motor, jet pipe and receiver. A current through the coil displaces the jet pipe from neutral. This displacement combined with the special shape of the nozzle directs a focussed fluid jet more into one receiver bore than into the other. The jet now produces a pressure difference in the control ports. This pressure difference results in a pilot flow, which in turn causes a spool displacement. The pilot stage drain is through the annular area around the nozzle to tank. Operating Principle of the Two-Stage Valve An electric input signal (flow rate command) is applied to the integrated control amplifier which drives a current through the coil of the pilot stage torque motor. The thus deflected jet pipe produces a pressure difference across the drive areas of the spool and effects its movement. The position transducer which is excited via an oscillator measures the position of the spool (actual value, position voltage). This signal is then demodulated and fed back to the controller where it is compared with the command signal. The controller drives the torque motor until the error between command signal and feedback signal is zero. Thus the position of the spool is proportional to the electric command signal. Failsafe Version D661-.P For applications with proportional control valves where certain safety regulations are applicable, a defined metering spool position is needed in order to avoid potential damage. Therefore, failsafe versions are offered as an option for the MOOG proportional valves. After external triggering, this failsafe function causes a defined metering spool position. Mechanical Failsafe version (biased pilot stage with mechanical feedback) The safe position of the spool will be obtained after cut off of pilot pressure supply (external pilot connection) or operating pressure supply (internal pilot connection). This safe position can only be obtained with +8.5 VDC Not enabledUC-B 0.75mm2 (AWG 16) ➢ Note: When making electric connections to the valv。