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QTRCO Q SERIES RACK & GEAR® VALVE ACTUATORS

PATENTED RACK & GEAR® ACTUATOR MECHANISM Offset cylinders align the piston axis with the pinion gear pitch circle diameter, eliminating the cantilever forces inherent in rack and pinion type actuators. Low friction rollers maintain correct engagement of the stainless steel gearing for absolutely exceptional cycle life. The reduced friction enables outstanding throttling control as demonstrated in numerous 'typical diaphragm actuator' applications where corrosion or high vibration dictated a better solution.

BI-DIRECTIONAL TRAVEL STOPS

QS actuators feature bi-directional travel stops which allow a minimum of 5 degrees of over travel in each direction. The stops act on the piston motion and impart no side loading on the shaft.

NON-PRESSURIZED SHAFT SEALS CANNOT FAIL (SPRING RETURN)

QS series spring return actuators apply no pressure to the shaft seals, eliminating a common cause of rack & pinion actuator failure.

PRESSURE BALANCED SHAFTS

While QS Series Double Acting actuators pressurize the shaft seals on the return stroke, we use a pressure balanced shaft design that is not subject to the high "pistoning" forces seen in typical rack & pinion actuators. Unbalanced shafts lead to higher friction, torque loss, and early failure.

NON-EXISTENT ROD SEALS CANNOT FAIL

Locating springs inward of the pistons applies pressure to the outer piston surface eliminating the need for rod seals on spring return actuators.

QTRCO Q SERIES - RACK & GEAR® ACTUATOR
DOUBLE ACTING SPRING RETURN (SINGLE ACTING)
Torques to 21,000 in-lb Torques to 7,500 in-lb
Pressure to 150 psig Pressures to 150 psig
Temperatures from -60°F to +400°F 90° Rotation (±5° at each end of travel)

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