C&K South - OEM Products

Limitorque Valve Actuators

SMB Electric Actuators

Whether direct-mounted to multi-turn valves, dampers or sluice gates, or side-mounted to HBC or PT worm gear reducers for quarter-turn applications, Limitorque SMB actuators deliver unsurpassed performance.

Introduced in the early 1960s, the SMB and the spring-compensated SB actuators for high-speed and high-temperature service are at work for the U.S. Navy, every nuclear power generating facility in the USA, and virtually every other industrial environment. With a rugged cast iron housing and precision-machined gearing,the SMB and SB actuators embody sensible design and solid construction.

From the extreme cold of the Alaskan North Slope to the extreme heat of North Africa and the Middle East, SMB actuators perform reliably year in and year out. For critical or demanding service conditions, trust the industry standard of excellence — SMB.

Features and Benefits


  • 50+ years of installed history

  • Unmatched durability, dependability and flexibility

  • Torque output to 60 000 ft-lb and thrust output to 500 000 lb

  • Fully qualified for nuclear applications to IEEE 384, 323, and 344

  • Weatherproof, explosion-proof and submersible constructions


Common Applications

Petroleum Production and Refining, Sewage Collection and Treatment, Tank Farm Transfer, Water Supply and Distribution (water), Boiler Circulation, Nuclear Service, Desalination, Filtration, Gas Production, Heavy Oil, Oil Sands and Shale, Molten Salt Transfer, Decoking