QS Series Stainless Steel Valve Actuators
Built to Last
Due to our belief that actuators should not fail - all QTRCO actuators
feature robust designs and premium materials
QS Series - Materials of Construction
Mechanism CF8M Stainless Steel
Housing CF8M Stainless Steel
Cylinders 316 Stainless Steel
Optional: Amalga Composite or Aluminum
Pistons CF8M Stainless Steel
Springs Powder Coated Chrome-Silicon Steel
Optional: Stainless Steel
Seals BUNA
Optional: Viton, Silicon
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.
Q Series - Rack & Gear® Actuator
Double-Acting
Torques 21,000 in-lb
Pressure Up to 150 psig
Temperatures -76°F to +450°F
Q Series - Rack & Gear® Actuator
SPRING RETURN (SINGLE ACTING)
Torques 7,500 in-lb
Pressures 175 psig
90° Rotation ±5° at each end of travel
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.
Q Series
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
F Series
A unique slotted body concept absorbs 100% of the yoke mechanism's side loading forces leaving the piston rod completely free of bending stresses while allowing termination of the rod at the yoke, and the addition of a weight and force balancing second force module diagonally offset from the first. The balanced weight makes lifting and handling of the actuators safer and easier, while reducing valve neck stress caused by unbalanced scotch yoke actuators. Internally, the balanced forces assure less friction loss and less wear as there is no net force applied to the shaft bushings.
T Series
The T-Series actuator demonstrates how we are committed to making life easier. An OEM of over the road bulk carriers was impressed by the capabilities of our Rack & Gear® actuators and they appreciated our ability to mount to numerous valves simply by selecting the proper adapters and mounting plate.
L Series
Using captured springs and the linear components of our rotary, our L Series Actuators provide a safe, long lasting, low friction, stainless steel substitute for diaphragm types in a smaller package for resistance to corrosion and vibration.
XRCISER®
The standard QTRCO actuator uses a travel stop screw in the end cap to limit outward travel of the actuator piston, and therefore valve travel. In the XRCISER® configuration the pneumatically engaged tandem pistons become the outward travel stop. By confirming tandem piston pressure and position; spurious valve travel is prevented during the partial stroke cycle.
Accessories
A wide range of valve actuator accessories make your valve actuator more useful and versatile.