Multi-Turn


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Nu-Torque

Multi-turn Valve Actuators

A multi-turn valve actuator allows the actuation of valves having linear movement. At Curtiss Wright, we offer a selection of multi-turn pneumatic actuators. They feature rising non-rotating stems or non-rising rotating stems, meaning they require multiple turns to move the closing component from open to close. Multi-turn valve actuators must perform more than one revolution and are therefore capable of quickly operating large valves. 

How does a multi-turn actuator work?

A motor drives a selection of gears to move a stem nut inside the valve, which then engages the valve's stem, allowing it to open and close via a threaded shaft. The valve is protected by a limit switch that turns off the motor at the ends of travel. A torque-sensing mechanism identifies when a safe torque level is exceeded and switches off the electric motor. It also usually features a declutching mechanism and hand wheel so someone can manually operate in a power failure event. 

Electric multi-turn actuators are one of the most common and dependable actuators. While it has many benefits listed below, if a power failure occurs, the valve remains in the position it remembers, and the fail-safe position cannot be obtained easily.

BENEFITS: 

  • Versatile design
  • Avoids pressure surges
  • Positioning accuracy
  • Submersible
  • Watertight
  • Basic and advanced functions in a compact housing
  • Explosion-proof
  • Remotely controlled
  • Open and close torque limit switches

RELATED PRODUCTS: MSM – MULTI-TURN MULTI-TURN ELECTRIC ACTUATOR, MS6M - MILITARY-SPEC NUTATING MOTOR ELECTRIC ACTUATOR, MS05M, MS12M, MS12H - MILITARY-SPEC MIL-SPEC MULTI-TURN ELECTRIC ACTUATOR.