Sungdo Valve heavy duty scotch yoke actuator product line offers a broad range of torques to 1,600,000 in-lbs. The SDHS series is designed to operate ball, butterfly, plug valves, dampers or any device that requires a quarter-turn movement for on-off or throttling service. Our standard offering is the symmetrical design yoke that delivers maximum torque at both ends of the 90º cycle. The square slide bearing with guide bar provides high cycle life and smooth stroke while minimizing wear points. We also offer a canted yoke design which is ideal for butterfly valves in sizes C11 and larger. See our website for the canted yoke product specifications. As with all Triac actuators, our SDHS series is accompanied by a complete line of accessories, including jackscrew & hydraulic overrides, limit switches, solenoids and positioners.Sungdo Valve also offers complete mounting hardware to integrate our actuators with any quarter-turn valve, damper or louver.
Double Acting and Spring Return
Dual travel stops1
Torques from 30 to 55,000 In-lbs
Standard end caps between DA and SR models
ISO 5211 / DIN 3337 mounting pad dimensions
Standard hard anodized body for corrosion resistance with options for ENP, PTFE and Epoxy coating to withstand any environment
NAMUR - VDI/VDE 3845 accessory mounting to accommodate a wide range of limit switches, positioners, solenoids and many other accessories
Wide base for direct mount to many butterfly valves
Substantial pinion bearings for high cycle life
Each unit serialized
Custom accessory mounting
SDAC Certifications
Torque Curves
Actuator Options
Double Acting
Spring Return
Features stabilizer bar for longer cycle life
Torques to 1,600,000 in-lbs
Easy factory mounting
Symmetric & Canted Yoke
DA/Hydraulic Override
The mounting attitude must be specified at time of order to ensure the hydraulic resevoir and pump pickup are correctly located. Due to continuous product improvement, please contact A-T Controls for certified drawings with the mostcurrent dimensions and specifications.
SR/Hydraulic Override
The mounting attitude must be specified at time of order to ensure the hydraulic resevoir and pump pickup are correctly located. Due to continuous product improvement, please contact A-T Controls for certified drawings with the most current dimensions and specifications.
Jackscrew Override
Declutchable Manual Override
Air Failsafe 1
When air supply drops below 30 psi, the spool valve will shift and rotate the actuator to the failsafe position, either clockwise or counter-clockwise as specified by the customer for one each 90º cycle.
Air Failsafe 2
Upon loss of electric, or when air supply drops below 30 psi, the spool valve will shift and rotate the actuator to the failsafe position, either clockwise (as shown) or counter-clockwise as specified by the customer for one each 90º cycle
