A-T Controls TRIAC® THD Series Heavy Duty Scotch Yoke Actuators

TRIAC THD heavy duty pneumatic actuators are designed for quarter turn operating devices including ball valves, butterfly valves, plug valves and dampers. The standard configuration is a symmetrical design yoke that delivers maximum torque at both ends of the 90° angle.

THD actuators are manufactured for extended high cycle life with alloy steel corrosion resistant and heat-treated springs, steel slide block, bronze slide bearings, and extra-large, strong piston. Their modular design allows for the actuators to be set up for different air pressures and for fail clockwise and fail counter-clockwise.

Key Specifications

  • Double acting or spring return
  • Torque: to 1,600,000 in-lbs
  • Travel adjustments ±8° for clockwise and counter-clockwise strokes
  • Ductile iron center body
  • Symmetric or canted yoke design
  • Visual position indicator
  • NAMUR accessory mounting

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