Electro Hydraulic Actuators 

Non-Intrusive Smart Electric Motor Actuators 

The Limitorque LTQ compact, quarter-turn electric actuator delivers superior reliability and performance through its industry-proven epicyclic locking gear set design. It is ideal for applications that require a simplistic, non-networked and cost-effective quarter-turn actuator that has analog controls, torque switches, limit switches, and discrete position feedback capabilities. The limit and torque switches, standard controls and a wide range of output offerings allow a higher degree of customization that can meet exacting customer needs. The LTQ003 Series are quarter-turn electric industrial service actuators delivering up to 440 lbf-in torque in voltages ranging from 12V up through 230V in on/off or proportional control modes. 

Proportional Electric Motors Non-Networked Applications

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.

Flowserve Limitorque electric actuators are offered in intrusive and non-intrusive designs, and with numerous optional upgrades to address various process, networking and operational needs.

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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

Flowserve Limitorque makes valve control easier in ways as diverse as the applications in which its products are used. LEH electro­ hydraulic actuators provide the ease and simplicity of electric power supply with the performance and safety of hydraulic actuators in one optimally engineered package.

• Units are equipped with two (2) volt-free Form A Auxiliary switches rated at up to 3A 24V
• ISO5211 compliant mounting with a double square female drive inserts
• Raised visual position indicator
• Manual override hand wheel is standard on 0H3 & 0H4 models
• Manual override shaft standard
• NEMA 4/4X & IP67 compliant
• Two (2) 1/2" EMT entry ports with sealed cable glands

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.

Intrusive Electric Motor Operators

​​Electric Motors, Electro-Hydraulic Actuator, Pneumatic Actuation