C&K South - OEM Products

Limitorque Valve Actuators

HBC Worm Gearbox

The Limitorque HBC series of worm gear operators excels in demanding applications, ranging from nuclear power plants to critical service flow control in hydroelectric plants. Whether utilized in manual operation or motorized with Flowserve Limitorque MX, L120 or SMB electric actuators, the rugged and dependable HBC offers unsurpassed quality and longevity for quarter-turn and multi-turn, torque-only applications. HBC worm gear operators are used to actuate ball, plug and butterfly valves, louver dampers, flop gates, radial gates, butterfly gates, and other devices. For manual operation, additive spur gear attachments, handwheels and wrench nuts are available. When driven by electric actuators, a wide range of output speeds and output torques is available to provide unparalleled versatility to meet virtually any operating requirement in a variety of environments. With eight product sizes covering torques to 93 000 ft-lb., the strongest and most reliable worm gear operator on the market delivers consistent, trouble-free performance. In production since the early 1960s, the HBC series is proven reliable, over and over again.

Features and Benefits


  • Rugged cast iron or ductile iron gear housing

  • Designed for weatherproof, submersible and buried service

  • Meets AWWA requirements for the water industry

  • Rotating components supported by low-friction bearings

  • 40+ years installed service

  • Fully qualified for nuclear service

  • Available for 360° operation


Common Applications

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