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Standard Specifications & Optional Accessories of Electric Actuators

 

Electric Actuators primarily consist of the following components

 
An electric motor as a prime mover (415V-3Ph/230V-1Ph/24V.DC)
A Gear reduction unit to increase the torque
Limit & Torque switches for end position control
A hand-wheel for manual operation in case of power failure
A local mechanical position indicator
Terminal strips / compartment for power & control cable connection
Cable glands for cable entries (min. 2 nos.)
Output drive to transmit the torque & speed to the valve shaft.
   
Electric Actuators can be provided with the following accessories/optional :
   
Additional Limit Switches for position indication or PLC interlock
Space Heater in switch compartment to protect the limit & torque switches from humid atmosphere / condensation
Potentiometer for remote position indication
Potentiometric (R to I) type Current Position Transmitter, which gives 4-20 mA signal from the actuator for the remote indication of valve position
Inductive (LVDT) type Current Position Transmitter, which gives 4-20 mA signal from the actuator for the remote indication of valve position
Electronic Positioner, which accepts the 4-20 mA command signal from the DCS / SCADA system, compares it with the present position of valve and positions the actuator as per the set value from PLC / SCADA system
Top bevel gear set to reduce the hand-wheel effort
Plug-Socket type connectors to facilitate easy dismantling & assembly
Integral Starter (Reversing Contactors), Local / Remote Control & Push Buttons for open-close operation