Accurate Torque Measurement (Patent)
Reliable Electronic System
Precise Valve Position Measurement
Phase Lost Protection
Intelligent Protection During Valve Jams
Motor Overheating Protection
Safe and Reliable Protection
Automatic Phase Correction and Adjustment
Instantaneous Reversal Protection
Indication and Monitoring Contacts
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.