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Limitorque Electric Actuators

The Limitorque product range includes actuators that can be controlled from customers’ motor control centers to electronic actuators that can be remotely controlled field devices. More than 1 million Limitorque actuators have been installed around the world, and some have been in operation for more than 50 years. The ruggedness and reliability of Limitorque electric actuators are among the primary reasons that customers continue to select Limitorque products.


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Intrusive Multi-Turn Actuators
Intrusive Multi-Turn Actuators

Flowserve Limitorque is the world’s oldest supplier of intrusive, electromechanical multi-turn actuators and continues to produce the world class L120 and SMB series of electric actuators.   Features and benefits include the modular L120 designed for ease of assembly, ruggedness and flexibility, and the most reliable and tested electric actuator available, the SMB.  Torque ranges from 100 lb.ft./136 Nm up to 20000 lb.ft./27200 Nm and can be coupled to Limitorque’s gearboxes for additional mechanical advantage.

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Non-Intrusive Multi-turn Actuators
Non-Intrusive Multi-turn Actuators

Flowserve Limitorque is a world class supplier of the non-intrusive, electronic multi-turn MX series of actuators. Features and benefits include patented absolute encoders w/ redundancy (B.I.S.T. - Built-in-self-test) and configuration, operation, and diagnostics in eleven languages. A full suite of network protocols are available including Modbus, Foundation Fieldbus H1, Profibus DP w/ Redundancy and Profibus PA, DeviceNet, and HART. Torque ranges from 55 lb.ft./73 Nm up to 1700 lb.ft./2307 Nm and can be coupled to Limitorque’s gearboxes for additional mechanical advantage.

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Non-Intrusive Quarter-Turn Electric Actuators
Non-Intrusive Quarter-Turn Electric Actuators

Actuators requiring 90° of rotation to operate are necessary for quarter-turn valves such as ball, butterfly, plug and dampers, and rotary control valves. These types of Limitorque electric actuators are available for operations such as open-close, modulating, network and rotary service. The QX is the Flowserve Limitorque product for the quarter-turn valve market up to 1500 ft-lb. Beyond that range any of the multi-turn products can be assembled with WG or HBC 90° worm gearbox operators to increase torque range and mechanical advantage.

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