下载-MOOG穆格771/772/773系列伺服阀手册

【资料简介】

                                MOOG穆格771/772/773系列伺服阀手册

 

穆格MOOG伺服阀The 771/2/3 Series flow control servovalves are throttle  valves for 3- and preferably  4-way applications.They are a  high performance, two-stage  design that covers the range of  rated flows from 1 to 15 gpm  at 1000 psi valve drop.The  output stage is a closed center,  four-way sliding spool.The pilot  stage is a symmetrical doublenozzle and flapper, driven by  a double air gap, dry torque  motor. Mechanical feedback of  spool position is provided by a cantilever spring.The valve  design is simple and rugged for  dependable, long life operation.  

穆格MOOG伺服阀These valves are suitable  for electrohydraulic position,  speed, pressure or force control systems with high dynamic  response requirements.

Principle of operation

穆格MOOG伺服阀 An electrical command signal  （flow rate set point） is applied  to the torque motor coils, and  creates a magnetic force which  acts on the ends of the pilot  stage armature.This causes a deflection of the armature/flapper assembly within the flexure  tube. Deflection of the flapper  restricts fluid flow through one  nozzle which is carried through  to one spool end, displacing   the spool.

穆格MOOG伺服阀Movement of the spool  opens the supply pressure port  （P） to one control port, while  simultaneously opening the  tank port （T） to the other  control port.The spool motion  also applies a force to the  cantilever spring, creating a  restoring torque on the  armature/flapper assembly。

Once the restoring torque  becomes equal to the torque  from the magnetic forces, the  armature/flapper assembly  moves back to the neutral  position and the spool is held  open in a state of equilibrium  until the command signal  changes to a new level.

穆格MOOG伺服阀In summary, the spool  position is proportional to the  input current and with constant pressure drop across the  valve, flow to the load is proportional to the spool position.

穆格MOOG伺服阀VALVE FEATURES  

➣ 2-stage design with dry torque motor

 ➣ Low friction double nozzle pilot stage  

➣ High spool control forces  

➣ High dynamics  

➣ Rugged, long-life design  

➣ High resolution, low hysteresis  

➣ Compley set-up at the factory  

➣ Small body size

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