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