VARIABLE SPEED FLUID COUPLING

  • Controls output speed and torque using fluid power transmission principles
  • Achieves significant energy savings in motor power consumption
  • Transfers power between the motor and the driven machine, allowing smooth speed control through fluid motion without mechanical contact

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NV Series

Standard and High-Speed Types
Scoop tube control type that adjusts speed by changing the oil volume inside the impeller
Basic model widely used for general applications

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NG Series

Built-in Gear Type
Scoop tube control type that adjusts speed by changing the oil volume inside the impeller
Equipped with step-up or reduction gears for adaptation to various system requirements

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NT Series

Valve Control Type
Adjusts speed by controlling the supply oil volume
Specially designed for engine-driven systems or equipment such as belt conveyors

Operating Principle
  • The fluid’s kinetic energy circulating between the primary (pump wheel) and secondary (turbine wheel) in a sealed chamber transmits power
  • The rotating fluid in the chamber transfers energy through centrifugal and tangential forces
  • The scoop chamber rotates with the pump wheel, and the scoop tube adjusts to maintain the proper oil level inside the impeller
  • The scoop tube is controlled by a rotary actuator and can be remotely operated automatically via PLC
  • By adjusting the oil volume inside the coupling, stepless speed control from 25% to 100% of rated speed is possible; the heat generated by slip losses is dissipated through an external heat exchanger
Features
  • Reduces motor power consumption
  • Significant efficiency improvement compared to traditional valve or damper control systems
  • Protects the driver from load shocks and vibrations during startup
  • Automatic remote operation via PLC
  • Low installation cost / No additional control system required
  • Minimal maintenance / High reliability
  • Up to 70% smaller installation footprint compared to other speed control devices
Energy Saving
When applied to centrifugal equipment, the variable speed fluid coupling enables load operation only as needed by speed adjustment, preventing energy waste.
Especially, controlling the driven machine’s speed achieves substantial electrical energy savings compared to valve-controlled systems.
Application
Thermal Power Plants
  • Boiler Feed Water Pumps
  • Boiler Fans (ID, SA, PA Fans)
  • Coal Mills
Nuclear Power Plants
  • Feed Water Pumps
Petrochemical Plants
  • Gas Compressors
  • Hydrogen Recycling Compressors
Coal Handling Systems
  • Belt Conveyors
Oil & Gas Production
  • Gas Lift Compressors
  • Export Gas Compressors
  • Loading Pumps
FPSO
  • Injection Compressors
  • Export Gas Compressors
  • Water Injection Pumps
  • Loading Pumps
Steel Plants
  • Cooling Water Pumps
  • Dust Collector Fans
  • Coal Crushers
District Heating Facilities
  • District Heat Pumps
  • Boiler Feed Water Pumps
Water Treatment Facilities
  • Water Supply Pumps
  • Booster Pumps