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QTRCOlogoQTRCO's, Objective is to build actuators that last forever. It's that simple. Our patented or patent-pending actuator designs feature the most innovative developments since actuators were invented, resulting in superior performance.


Q-SERIES

Q-Series Rack & Gear™ Actuators

Q-Series Rack & Gear™ Actuators are direct replacements for traditional R&P actuators. The design incorporates numerous considerations that simplify user installation, improve performance, and extend actuator life. Cylinders are offset to eliminate internal cantilever loads. Low friction rollers support the racks; twin rails on the racks assure proper gear engagement. Shafts are pressure balanced to remove the pistoning effect common to R&P actuators. Failure-prone seals are designed out, replaced with readily available industry-standard O-rings. And bidirectional travel stops actually stop the piston motion, eliminating the considerable side loading that pinion-located stops create.

MAIN FEATURES

  • Available in Ductile Iron (QD Series) or 316 Stainless Steel (QS Series)
  • 100 to 15,000 pound – inches
  • Change action from 'fail open' to 'fail closed' by turning top side down
  • Patented low friction design for longest life
  • Top side standard with NAMUR accessory drive geometry
  • Optional cylinder materials available
  • Fewer seals to wear
  • Captured springs

DESIGN FEATURES

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  1. Captured, full size springs located inward of the pistons mean that the shaft seals are not pressurized on the SR version, which eliminates a common cause of R&P actuator failure and reduces air consumption by greatly reducing void volume; permits on-site O-ring replacement.
  2. Roller type rack support bushings, reducing friction and wear.
  3. Bidirectional travel stops actually stop the piston motion causing no pinion force loading—unlike pinion-located stops, which allow full piston force to push the pinion into high friction contact with the actuator body.
  4. Offset cylinders align piston axis with pitch circle diameter of the pinion gear to eliminate internal side loading, friction, and cylinder wear.
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  5. Twin side rails on racks assure correct gear engagement for extended cycle life.
  6. Identical shaft end areas prevent axial thrust, and massive shaft bushings fully prevent shaft-to-body contact.