Electric

electric_actuator_ava_1
 
GREATORK
Non-Intrusive Design
Double-Sealed Structure
Accurate Torque Measurement (Patent)
Reliable Electronic System
Precise Valve Position Measurement
Phase Lost Protection
Intelligent Protection During Valve Jams
High-Definition LCD
Motor Overheating Protection
Safe and Reliable Protection
Automatic Phase Correction and Adjustment
Instantaneous Reversal Protection
Indication and Monitoring Contacts
Backup Battery
Analogue Folomatic Control (Option)
Field bus Control Function (Option)
Remote Indication of Valve PositionThe Internal Structure of AVA actuator1.  Torque Measurement
Greatork actuator which adopts precise pressure sensor can have fast and accurate detecting of output shaft torque.

2.  Motor and Drive
Greatork three-phase squirrel-cage asynchronous motor designed by advanced special software can work in extreme environments with F class insulation.  The motor shaft and worm shaft are separate in order to facilitate rapid replacement.  Worm and worm shaft are immerged in lubricant to fit temperature change.

3.  Terminal Compartment
Separately sealed terminal compartment can make sure of the integrity of the electrical control part even when the terminal compartment cover is removed for site wiring.

4.  Thrust Base
Models below AVA06 are fitted with lubricated, removable type ‘A’ thrust base.  Actuators can be removed without changing valve position.  AVA07 and above models’ thrust bases are integrated with enclosure.  Simple and removable drive bushing can be machined to fit valve stem.

5.  Valve Position Counter
Greatork discards traditional potentiometer to measure valve position and introduce hall incremental encoder to improve the position accuracy.

6.  Local Control
Local control switch (Local/stop/Remote) and pushbuttons are magnetic switches without penetrating shafts and control the actuator by internal magnetic reed.  It can meet the requirements of tight seal and damp-proof.

7.  Infrared Setting
Infrared setting tool can set and diagnose actuator through sealed indication window without removing the electric cover.  The communication distance between setting tool and window is within 0.75 meters.

8.  Manual Operation
The hand wheel (or independently geared hand wheel on larger size) can be directly driven with low speed padlockable hand/auto clutch to provide reliable emergency manual operation in the event of a power supply failure.  Manual operation has lost motion “hammer blow” affect, which will facilitate easy valve operation.


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electric_actuator_avar
 

AVAR Range Electric Actuator

Features and Functions of AVAR Electric Actuator
AVAR Reserved Functions of AVAT
AVAR Changed Functions of AVAT
Button setting of Parameters
High-brightness Industrial LCD Display

 

The Internal Structure of AVAR Actuator

1.  Liquid crystal display
Dot Matrix LCD with blue backlight can clearly show Chinese or English menu.  Real-time valve position, torque valve, actuator current status and fault information will also be shown.  At the bottom of the screen, there are three high brightness diodes which can indicate open, close and middle position of valve.

2.  Main board
The adoption of SOC chip and high integrated circuit design provide actuator with multiple functions such as fault detection, self-protection and alarm.  Therefore, the reliability of actuator is improved.

3.  Valve position control
Hall absolute encoder driven by main shaft can measure the valve position accurately.

4.  Button
There is four buttons called local/remote/menu button, open/plus button, and close/minus bottom and stop/enter button on the actuator.  User can set up various functions of actuator easily with these buttons.

5.  Motor
Greatork uses high torque, low inertia squirrel cage motor with F class enamel-insulated wire and two internal thermal switches.

6.  Power supply board
The electronic components used to control motor, power supply and other parts are integrated on the power supply board.

7.  Hand wheel
Actuator has a hand wheel, which can operate the valve by user when power is off.  The dimension of the hand wheel is designed for labor saving.

8.  Handle
Turning the handle can switch the actuator to manual status when manual operation is needed.

9.  Worm and worm shaft
Two-stage worm reducer has large transmission ratio, low noise (50dB is the highest) and self-lock functions.

10.  Clutch
Clutch is used to switch manual and electric operation.

11.  Base
The installation dimension of the base conforms to ISO5211 standard and the drive bush can be machined according to the requirement of user.

12.  Terminal compartment
The double-seal design of the terminal compartment can protect the internal electric components from the outside hazardous gas during site wiring.


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