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QTRCO
The founder of QTRCO, Ed Holtgraver, was responsible for field service of a large valve company. He saw customers lose vast amounts of time, production hours and ultimately money from misapplied products. Products that would have worked better had greater attention to detail been applied during the design phase.
By founding QTRCO, Ed’s intent was to design and build actuators that simply did not encounter field service issues. With a very rugged mechanical design and the elimination of normal failure modes—sliding parts, side load forces and numerous seals—the QTRCO actuators have evolved into exactly what Ed had in mind those many years ago.
Quick delivery possible for a selection of QTRCO actuators
QTRCO pneumatic actuators: Install it and forget it.
Rack & gear® quarter turn Q series, Flat yoke® quarter turn F series and linear L series actuators.
Used and/or approved by GE, Shell, Akzo, Baker Hughes, Basf, Bayer, DuPont, Exxon, UOP, Invista, LyondellBasel, PPG, Total.
If your regular pneumatic actuator doesn’t last because of extreme conditions QTRCO has the solution and they back this by a 3-year warranty which is independent of the number of cycles.
If you need a closing time as low as 0,1 seconds
If you need high reliability & maximum availability
If your actuator is exposed extreme environmental conditions (corrosive, high- or low temperatures)
If you require superior control capability (low hysteresis and dead band)
If you require a unique solution for partial stroke, manual override & integrated lockout)
Industries served: food & beverage, (petro)chemical, power, oil & gas, pulp & paper, nuclear and more.
Available material (combinations):
Ductile Iron, Carbon Steel,
Stainless Steel, Amalga composite.
Reliability by design:
- Zero side loading on the shaft bushings
- Pressure balanced shaft eliminates thrust force
- Massive shaft bushings
- Zero cantilever forces
Maximum availability with low cost of ownership
- If necessary, seal replacement can be done while the actuator is on the valve
- Dual travel stops eliminate the need to recalibrate the switches or positioner.
- Spring return actuator cylinders can be turned while the actuator is on the valve, a new sealing surface is provided with the “inherent” on board spare part.
- Non-proprietary actuator seals are readily available. This is the only seal in the actuator.
- Captured springs located inward of the pistons allow fast and easy maintenance.
Quarter run
Q series Rack & gear® SA: 847 Nm, DA: 2.374 Nm
T series Rack & gear® SA: 847 Nm, DA: 2.374 Nm
F series Flat Yoke ® SA/DA: 56.500 Nm
Linear
L series 200.170 N
Temperature -60°C to 204 °C
One quarter turn actuator that is fail close and fail open just by turning it upside down
Suitable for (environmental) extremes:
- the basis: robust design & premium materials
- high and low temperature construction options
- high speed stroking capabilities
- standard design suitable for high cycle applications
- complete SS construction available
Customers have reported over 15.000.000 cycles without failure.
Temperature capabilities - Ultra low -60 / 85°C
- Low -50 / 85°C
- Standard -29 / 85°C
- High -29 / 200°C
- Limits may be extended with proper insulation
Superior control capability
Take away the lag and drag so you know when the actuator and valve start and stop: - minimal friction by design, less hysteresis & variability
- tighter tolerances to reduce backlash & hysteresis
- elimination of side loading force
- tighter tolerances for valve to actuator connection to reduce dead band.
Actuator design that resolves every issue with currently available partial stroke testing solutions.
Rack & Pinion design
- Piston axis align to cylinder bore
- Outward forces push rack against the cylinder wall
- Shaft seals are pressurized every cycle
- Bottom end of shaft bigger than upper: shaft pushed down
- Shaft & mounting geometry are different on top and bottom side of the actuator
- Complete disassembly required for maintenance
- Cylinders are an integral part of the actuator body
- Not all springs are captured
- Sometimes the travel stop only contacts 1 piston or a single cam is used.
Effect
- Exhibit high friction % wear from internal cantilever-initiated forces
- Creating friction & motion resistance as rack slides against the cylinder
- Seals will wear, complete disassembly required to replace
- Additional friction & wear
- Disassembly required to reverse actuator action
- Removal from valve required
- If cylinders are damaged the complete actuator needs to be replaced
- Safety can be an issue during service
- Travel stops create side loading, friction & shaft wear
Rack & Gear ® solution
- Offset cylinders so that piston axis align with gear PCD. No damaging forces
- Eliminate contact between rack & cylinder. No contact no friction.
- Move springs inward of cylinders. Pressurize SR actuators between piston & end cap. Non pressurized seals don’t leak.
- Balanced shaft: no up or down forces
- Top & bottom are identical. Just turn the actuator to change fail action. No disassembly required.
- Standard possible to replace piston (only) seals with actuator on the valve.
- Cylinders are a separate component to enable replacement. With SR actuators cylinders can be turned in the field (inherent spare part)
- All springs are captured. Safety is improved.
- Both pistons are stopped simultaneously: zero side loading
Scotch yoke design
- Long & heavy spring on one end, small and light piston on the other
- Single yoke arm design
- Piston pressurized on body side
- Proprietary rod seals
- Piston rod seals wear
- Piston rod self supporting or support structure in body
- Fail action reversal requires parts to be placed at opposite side
- Travel stops are on yoke arm
Effect
- Imbalanced weight with SR, stress on the valve “neck” and piping & possible mounting & space issues.
- Imbalanced internal forces: wear & torque reducing friction
- Piston rod seals required
- Expensive, not readily available
- Complete actuator disassembly when replacement is required
- Side loading on piston rod
- Actuator needs to be disassembled by trained personnel in the workshop
- Piston and spring forces continuously to act with maximum values on yoke arm.
Flat yoke® solution
- Balanced weight design: less space & weight, no stress on the valve and piping.
- Balanced force design: zero side loading
- Design without rod seals
- Design without rod seals
- Design without rod seals
- Design where side loading is absorbed in body, non applied to the rod.
- Design where actuator only needs to be turned upside down
- The inward and outward piston motion is stopped directly by using aligned travel stops