Electric Actuators

Electric actuators open, close and position valves and dampers from a motor and gearbox, with local or remote control from a DCS, PLC or SCADA system. Seven Star LLC, an independent supplier in Muscat, supplies electric actuators from AUMA, Schischek, ABB, Biffi, Flowserve Limitorque, Rotork, Bettis, Johnson Controls, SAUTER and EBRO to oil and gas, water and building customers in Oman and the GCC.

Types of electric actuator in this category

Multi-turn actuators such as the AUMA SA and SAR, the explosion-proof SAEx and SAREx and the Flowserve Limitorque L120 drive gate and globe valves. Part-turn actuators including the AUMA SQ, SQEx, SGC and PROFOX, Bettis SCE300 and Biffi EFS fail-safe units operate ball, plug and butterfly valves. Linear units like the AUMA LE and the ABB Contrac RSD series stroke control valves, and ABB Contrac rotary actuators and Schischek ExMax and RedMax units serve modulating and ATEX damper duty. Building automation actuators from Johnson Controls and SAUTER drive HVAC valves and dampers.

How to select a electric actuator

Define valve type, required torque or thrust, number of turns or travel and operating time. Choose on/off or modulating duty, the control interface (hardwired, 4-20 mA, HART, Profibus, Modbus, Foundation Fieldbus) and integral controls if needed. Confirm supply voltage, enclosure rating, hazardous area certification (ATEX or IECEx), fail-safe requirement and the valve mounting flange to ISO 5210 or ISO 5211.

Data needed for a quotation

Send the actuator type code, or valve type and size, torque, operating time, voltage, control signal, Ex rating and quantity.