903 SERIES ELECTRIC VALVE ACTUATORS
FOR MULTI-TURN VALVES
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Main Performance
  • Power supply: 3-phase AC 380V 50Hz
  • Protection against circumstances:
        Basic version: IP65
        Waterproof version: IP67
  • Ambient temperature: -20¡«40¡æ
  • Output torque: 200¡«2500 Nm
  • Output speed: 12¡¢18¡¢24¡¢36 r/min
  • Motor power: 0.55¡«7.5 kW
  • Suitable for mounting at any operating angle.

    Control Package
  • The reversing contactors and thermal overload relay serve for motor control.
  • LOCAL/REMOTE selector switch and OPEN-STOP-CLOSE button serve for local operation.
  • VOT converter provides 4~20mA DC position feedback signal for remote indicatation.
  • EPC VOT digital control package is useful to control valve by 4~20mA DC input signal.
Construction Features
  • Motor, As a special motor for valve, it has high starting torque. The rated running time is 10 minutes
  • Reduction mechanism, Composed of one-step spur gear pair and one-step worm gear. There is a idle stroke in connection of the reduction mechanism and output shaft, thus, a shock-torque can be formed at the moment from standstill to running of the valve.
  • Stroke control mechanism: Rotary turns of outpour shaft are fed back through a counter. There is a limit switch, which is fitted with self-cleaning type rotary design, on small gear axle of the counter. When the turns of the output shaft come up to the setting value, the small gear axle turns to drive the limit switch. Normal counter consists of two groups (signed as 2Z) and can control open and close positions of valve. The other counters with four groups are available for user option (signed as 4Z, two groups for open position the others for close position). The limit switch on each group is fitted with two contacts (signed as 4K) for user's option. 
  • Torque control mechanism, An axial play design of worm shaft is adopted. There is a disk spring on the worm shaft. The axial play can be converted into rotation of torque shaft through crank to turn torque disk and then stop block on the torque disk drives.
  • Mechanical indicator, The indicator consists of multi-step pure gear reduction mechanism. It can exactly show the opening degree of valve through the turns of output shaft from full close to full open. The indicator is fitted with a potentiometer used for remote indicatation. When ordering, user should offer exact turns of valve stem in full stroke.
  • Manual/electric changeover mechanism:
        ¡ó The actuator with 9032 frame is fitted with semi-automatic changeover mechanism. As the output shaft stops at any position, moving changeover lever can shift into manual operation. As the motor running, clutch can make actuator return to electric operation position automatically.
        ¡ó The actuators with 9033, 9034, 9035 frame are fitted with manual changeover mechanism. A small manual changeover force is needed to obtain reliable changeover operation.

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