Limitorque Electric Actuators

Limitorque valve control solutions have been making control easier at the field-device level for over 80 years. Limitorque actuators drive multi-turn and quarter-turn industrial valves and dampers, day after day, year after year, using conventional and advanced technologies to reduce costs and increase operating efficiencies for customers.


On this website, you have access to manuals, products specifications, spare parts lists, and information about CI Actuation Service and Repair capabilities. CI Actuation is an authorized stocking Distributor and we maintain service centers across the country. We have been awarded the Limitorque Top Distributor in Total Sales award in 2006, 2007, 2008, 2009, 2010, and expect to receive the award again to 2011. In this section, please use the links below to select the specific model LImitorque actuators that you are interested in.

Limitorque Electric Actuators

<font size=4>MX Series</font><font size=4>L120 Series</font><font size=4>SMB Series</font><font size=4>QX Series</font><font size=4>LY Series</font><font size=4>SM Series</font><font size=4>SMC Series</font><font size=4>B320 Series</font><font size=4>HBC Series</font><font size=4>SMA Series</font>

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Two control switches for setup, monitoring, and adjustment. Three light-emitting diodes (LEDs) signal valve and actuator status. 32-character LCD display is easy to see and understand. Fast, non-intrusive setup without tools responds to .yes. or .no. answers. Local diagnostics speed servicing. Password and padlock provide security. Separate, double-sealed termination chamber protects internal controls.
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The Flowserve Limitorque QX is the entry into the quarter-turn non-intrusive, double-sealed, smart electronic actuator marketplace. Continuing the legacy of the industry’s state-of-the-art multi-turn MX actuator from Limitorque, the QX design builds on more than 15 years of proven MX technology to provide all the user-preferred features in a quarter-turn smart actuator package. It is the only non-intrusive, double-sealed quarter-turn actuator to display the Limitorque brand.
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Aluminum and ductile iron housings offer durability. Available in weatherproof, submersible, and explosionproof construction for the most demanding environments. All metallic lubricated steel-on-bronze gearing has shaft-supported anti-friction bearings for years of reliable operation. Manual declutching disconnects motor from handwheel to protect personnel. Torque overload protection in both directions. Motors are optimized for valve actuation. Units connect within most network configurations.
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Rugged cast iron housings offer years of durability Insertable stem nut permits stem nut replacement without major dissasembly Double reduction (helical and worm) gear set optimizes speed versus torque sizing trade-offs Automatic torque limit disconnects power in case of valve obstruction to prevent damage Full access compartment facilitates calibration, set up, and maintenance.
View Sizing Specifications, SMB Instructions & Maintenance Manual

Manually operated or automated with a Limitorque electric actuator Fully weatherproofed, permanently lubricated, and supported on anti-friction bearings Design features include: valve position pointer, alloy steel worm shaft, bronze worm gear, and adjustable mechanical stop, all enclosed in a cast-iron housing.
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Easily converted for motorized applications Weatherproof enclosure (NEMA 4) or temporary submergence service to NEMA 6,IP 67/68 Spur gear attachments available to reduce input torque Rugged cast iron enclosure meets the most severe environmental conditions Machine-generated gearing assures minimum backlash and smooth operation Bevel pinion and bevel gears are completely supported on anti-friction bearings.
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Modular design provides flexibility and simplifies servicing and maintenance. Easy-access compartment speeds setup, service, and maintenance. Compact, light-weight design is durable and corrosion-resistant. Integral controls offer a wide range of options for automation.
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Flowserve Limitorque PT series worm gear operators are the first such devices optimized specifically for motorized operation. PT operators provide the user with a dependable, efficient, & economical solution for quarter-turn applications. Available in output torques to 120,000 foot pounds. The PT is the worm gear box developed by Limitorque to delivery extraordinary valve control.
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