Valtek XL Series High Performance Positioner
Valtek XL SeriesHigh Performance Positionerfor Control Valves
Valtek XL Series PositionerFeaturesEasy calibrationCorrosion-resistantcover and baseGroundScrewOutput 1Output 2Simple signalconversion withinterchangeablemodulesIndependentzero and spanadjustmentsSplit rangescan be easilyadjustedAdjustable gainfor preciseprocess tuningSupply PortTwo-sided cam foreasy field reversibilitycommon with Betaseries positionerFigure 1: Features of XL Series Positionerwith Pneumatic or Electro-pneumatic ModulesIntroductionThe Valtek XL series, two-stage positioner offers fastand sensitive dynamic response characteristics to meetextremely demanding control objectives. Thepositioner is available with either an electro-pneumatic(I/P) transducer module for milliamp current controlsignals or a pneumatic module for air control signals.Designed for high performance, this positioner is compact, field reversible and ruggedly built for reliability insevere industrial environments. The XL positioner usescommon mounting brackets and follower arms with the2Beta Series and 80R positioners; therefore, the positioner can be mounted on either Valtek linear or rotaryactuators without additional hardware. Two and threeway split ranges are available without special feedbacksprings.Mounting kits are avialable to install the XL positioner onother manufacturers’ actuators for improved performance.Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
Valtek XL Series PositionerFigure 2: XL Series Positioner Mountedon Valtek Linear ActuatorFigure 3: XL Series PositionerMounted on Fisher 657 ActuatorCalibration is easy using the XL positioner due tominimal interaction between zero and span. Also, thepositioner’s simplicity, modular design and few parts,make maintenance quick and easy.In addition to offering premium performance to meetdemanding control needs, the XL positioner is alsoadaptable for various applications and can be used onboth single- and double-acting valve actuators. (SeeFigure 2 and 3.) The XL positioner with NT 3000 I/Ptransducer module is universally certified for intrinsically safe and explosion proof applications. (See TableII for a complete listing.)Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611When an application demands extremely fast strokesand fine control, the XL Series positioner is clearly thebest, dependable solution.3
Valtek XL Series PositionerAdvantagesI/P or P/P Signal ConvertibleShock and Vibration ResistantField conversion from one control signal to another is easilyaccomplished by replacing one module with the other, greatly reducingspare parts inventory.XL positioners are designed with a high natural frequency coupled withpneumatic damping – unaffected by vibrations with acceleration up to 2g’s and frequencies to 500 Hz.For Single or Double-actingActuatorsUsable with either single or double-acting actuators (both linear androtary) makes the XL Series positioner versatile.Easily Field ReversedAction can be reversed in the field by simply turning the cam over,reversing anti-backlash spring and changing output tubing.Easy Calibration ProceduresCalibration is easy due to minimal interaction between zero and span.Other positioner adjustments are enclosed for protection to discouragetampering.Split-Range ServiceStandard signal ranges are 4 - 20 mA for the electro-pneumatic (I/P)model and 3 - 15 psi for the pneumatic (P/P) model. Optional range is10 - 50 mA. All models can be calibrated for a 2- or 3-way split rangewithout additional parts.The XL positioner’s simplicity, modular design and few parts, makemaintenance quick and easy.Simplified MaintenanceNo Regulator* RequiredThe XL positioner with the NT 3000 I/P or the pneumatic module isdesigned to withstand 150 psi at all ports and is relatively insensitive tosupply pressure fluctuation.Changeable Flow CharacteristicsEasily changed cam provides flow characterization.Insensitive to Mounting PositionPositioner can be mounted in any orientation without affectingperformance.Corrosion Resistant Partsfor Long LifeCover and base assembly are epoxy powder painted and continuouslypurged from the inside with instrument air. Internal working parts areconstructed from 300 series stainless steel, anodized aluminum or Buna-N.Low Air ConsumptionSteady state air consumption is .28 SCFM / .48 m3/hr @ 60 psi / 4.1 barsupply maximum (.34 SCFM / .58 m3/hr with I/P module).Extended Temperature ModelI/P: -40 F to 185 F / -40 C to 85 C; P/P: -50 F to 250 F /-46 C to 121 COxygen Service ModelPneumatic models are available with fluorosilicone diaphragms andO-rings.With the NT 3000 I/P TransducerReplaceable Coalescing Filter*Removes particles that may clog transducer. Large orifice / air passagesprovide additional protection against clogging. Positioner includesorifice screen to prevent clogging.Minimum Pressure CutoffWhen enabled, causes the NT 3000 transducer output to decrease tonear zero when input signal falls below a user-settable point.Output Gauge Helps Monitor UnitIndicates transducer output to positioner, permitting easy troubleshooting.Self-controlling Internal Regulator Reduces pressure to 22 psi / 1.52 bar, eliminating need for externalregulator.*With any sensitive pneumatic instrument, a clean air supply is required. This instrument must have an air supply meeting or exceeding SA7.3.4Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
Valtek XL Series PositionerOperationCylinderSupply SeatUpper PilotPoppetZero AdjustmentBalance AdjustmentRangeAdjust ScrewExhaust SeatPistonPort No. 1RestrictionPilot ValveCapsuleFollowerArmDetectingNozzleExhaust SeatOFlapperPort No. 2Upper DiaphragmInstrument SignalLower DiaphragmLower PilotPoppetSupply SeatCamFeedbackSpringSupplySInput CapsuleTake-off ArmFigure 4: XL Positioner Schematic for Air-to-OpenThe XL positioner is a two-stage, force-balanced instrument. Figure 4 shows an XL positioner with either anelectro-pneumatic or pneumatic module, installed on adouble-acting actuator for air-to-open action. Positioning is based on a balance of two forces: one proportionalto the instrument signal and the other proportional to thestem position.The current signal for the NT 3000 I/P module is firstconverted to a 3-15 psi air signal, while the 3-15 psi airsignal for the pneumatic model is passed directly intothe positioner. The transducer receives an electric current input signal and converts it to an output proportionalto the input. The supply pressure is filtered and regulated in the transducer by a filter element and an internalregulator.The output of the transducer is controlled by a feedbackloop consisting of a pressure sensor, electromagneticpressure modulator and circuit board. The pressuremodulator consists of a stiff flapper that is attracted bythe electromagnet to a nozzle. The nozzle-flapper spacing determines the transducer output. Based on thedifference between the input and the output measuredby the pressure sensor, the circuit board sends a currentto the pressure modulator that adjusts the nozzleflapper spacing to provide the correct output pressure tothe positioner. For more information, refer to the NT3000 I/P Transducer Module technical bulletinFlowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611The positioner operates as follows: An increase in theinstrument signal forces the instrument signal capsuleand flapper downward. The detecting nozzle now releases air and the pressure decreases on top of the pilotvalve capsule. The pressure differential moves the pilotvalve capsule upward, opening the upper supply seatand allowing supply pressure to port 1. This opens theexhaust seat on port 2, causing the actuator piston tomove upward.The upward motion of the piston is transmitted back tothe positioner through the feedback linkage and camresulting in the spring being stretched proportionally tothe valve position. The piston continues to stroke upward until the force in the feedback spring increasessufficiently to counter the force generated by the instrument signal capsule. At this point, the balance beamand spool begin to return to their equilibrium position.As the valve spool ports start to close, the air flow rateto the actuator is decreased.After the piston has reached the required position, thefeedback spring tension force will equal the force generated in the instrument signal capsule. The flapper andinstrument signal capsule will remain in their equilibriumpositions with no air flowing to the actuator until achange in the instrument signal is made.A decrease in signal reverses the action, causing downward movement of the actuator piston and stem.5
Valtek XL Series PositionerPerformance Test ResultsTable I: XL Series Positioner SpecificationsSpecificationInput Signal RangeSupply PressureAmbientTemperature LimitsConnectionsStandard MaterialsLoop LoadNet WeightPneumatic Module3-15 psi / .21-1.0 bar, 2- or 3-way split range;6-30 psi / .41-2.1 bar, 2- or 3-way split range;4-way split range30 psi to 150 psi / 2.1-10.2 barStandard model: -20 F to 185 F /-29 C to 85 CExt. temp. model: -50 F to 250 F /-45 C to 121 CSupply, instrument and output: 1/4-inchNPT; Gauges: 1/8-inch NPTStainless steel, anodized aluminum,epoxy powder-painted steel and Buna-NN/A3 lbs. / 1.4 KgI/P Module4-20 and 10-50 mA with 2 or 3 and4-way split rangeSameStandard model: -20 F to 180 F /-29 C to 82 CExt. temp. model: -40 F to 180 F /-40 C to 82 CSignal: 1/2-inch NPT elect. conduit; M20Output: 1/4-inch NPT; Gauges: 1/8-inch NPTSame5.3 volts 5 ohms (270 ohms at 20 mA)5.5 lbs. / 2.5 KgTable II: NT 3000 I/P (Electro-pneumatic) TransducerHazardousLocation ApprovalsExplosion proof:CLI, Div 1, Grp B, C, D FM / CSAEExd, IIB H2 T6 CENELECExd, IIB H2 T6 SAA / CEPELIntrinsically safe:CLI, II, III, Div 1, Grp A-E FM / CSAEEx ia IIC T4 (Ta 80 C) CENELECEx ia IIC T4 SAA/CEPELTable III: XL Series Positioner PerformanceTESTResponse Level – Average change in input required to cause a change invalve stem position in one directionDead Band – Average change in input required to cause a reversal in valvestem movementResolution – Smallest possible change in valve stem positionIndependent Linearity – Maximum deviation from a best fit straight lineRepeatability – Average variation in position for the same value of input whenapproached from the same direction.Steady State Air Consumption @ 60 psi / 4.1 barSupply Pressure Effect – Position change for a 10 psi / .69 bar supplypressure change.“Open-loop” Gain – Ratio of cylinder pressure unbalance to instrumentpressure change with locked stem @ 60 psi / 4.1 barMaximum Flow Capacity @ 60 psi / 4.1 barFequency Response – (With sinusoidalFrequency of 5% F.S. centered about 50% F.S.)Stroking Speed – Speeds for a 100% stepchange in the input signal-6 dB FrequencyPhase Angle at -6dBopeningclosingXL0.1% F.S.*XL I/P0.1% F.S.0.1% F.S.0.1% F.S.0.1% F.S. 1.0% F.S.0.1% F.S.0.1% F.S. 1.0% F.S.0.1% F.S.0.28 SCFM.47 m3/hr0.2 % F.S.0.34 SCFM.58 m3/hr0.2% F.S.Adjustable400 to 1100:1psi / psi@ 60 psi16.5 SCFM28 m3/hr6.0hz-156.0 1.88 in / sec.3.0 in / sec.Adjustable535 to 1465:1psi / psi@ 60 psi16.5 SCFM28 m3/hr6.0hz-156.0 1.88 in / sec3.0 in / secNOTE: Testing was performed on a Mark One with a 25 square-inch actuator, air-to-open, Teflon packing, 1.0-inch valve with a 0.75-inchstroke. Results may vary depending on valve system configuration. *F.S. Full Scale.6Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
Valtek XL Series PositionerDimensions with Electro-pneumatic (I/P) Transducer(inches / mm)3.64923.9199Output 2(1/4-inch NPT).6717ValtekOutput 1(1/4-inch NPT)XL5.0812945.5-11.5.5 nnection1/2-inch NPT(M20 optional)2.3359Side ViewFront View8.53217.39101.9750.39108.032043x .2 dia. mountingholes for #10 screws2.1354Output 2(1/4-inch NPT)O .80dia.ventscreenOutput 1(1/4-inch NPT)2.0151 3.6292.39102.24573.7595.6617.123Electrical connection1/2-inch NPT(M20 optional)1.79454.28109Top ViewFlowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611Back View7
Valtek XL Series PositionerDimensions with Pneumatic (P/P) Module2.05523.91993.6492(inches / mm).6717Output 2(1/4-inch NPT)5.08129Output 1(1/4-inch NPT)45¡.5-11.5.5 Thru8-inchStroke22.5¡22.533.5Instrument(1/4-inch NPT)4.6817Supply(1/4-inch NPT)Front ViewSide View5.881491.9750.39103x .2 dia.mounting holesfor #10 screws.39102.1354Output 2(1/4-inch NPT)fl .88dia.ventscreenOutput 1(1/4-inch NPT)2.0151.6617.123Top ViewInstrument(1/4-inch NPT).93 24.3910.7619Supply(1/4-inch NPT)1.7945Back ViewFlowserve Corporation has established industry leadership in the design and manufacture of its products. When properly selected, this Flowserve product is designed to perform itsintended function safely during its useful life. However, the purchaser or user of Flowserve products should be aware that Flowserve products might be used in numerous applicationsunder a wide variety of industrial service conditions. Although Flowserve can (and often does) provide general guidelines, it cannot provide specific data and warnings for all possibleapplications. The purchaser/user must therefore assume the ultimate responsibility for the proper sizing and selection, installation, operation and maintenance of Flowserve products.The purchaser/user should read and understand the Installation Operation Maintenance (IOM) instructions included with the product, and train its employees and contractors in the safeuse of Flowserve products in connection with the specific application.While the information and specifications presented in this literature are believed to be accurate, they are supplied for informative purposes only and should not be considered certified oras a guarantee of satisfactory results by reliance thereon. Nothing contained herein is to be construed as a warranty or guarantee, express or implied, regarding any matter with respectto this product. Because Flowserve is continually improving and upgrading its product design, the specifications, dimensions and information contained herein are subject to changewithout notice. Should any question arise concerning these provisions, the purchaser/user should contact Flowserve Corporation at any of its worldwide operations or offices.For more information, contact:For more information about Flowserve and its products,contact www.flowserve.com or call USA 972 443 6500Manufacturing Facilities1350 N. Mt. Springs Prkwy.Springville, UT 84663Phone 801 489 8611Facsimile 801 489 3719Alläe du Quartz 1CH-2300 La Chaux-de-FondsSwitzerlandTelephone (41) 32 925 9700Facsimile (41) 32 926 5422Quick Response Centers5114 Railroad StreetDeer Park, TX 77536 USATelephone 281 479 9500Facsimile 281 479 8511104 Chelsea ParkwayBoothwyn, PA 19061 USATelephone 610 497 8600Facsimile 610 497 66801300 Parkway View DrivePittsburgh, PA 15205 USATelephone 412 787 8803Facsimile 412 787 1944Flowserve and Valtek are registered trademarks of Flowserve Corporation.Rev. 1/99 1999, Flowserve CorporationFlowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
Valtek XL Series Positioner Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611 Figure 2: XL Series Positioner Mounted on Valtek Linear Actuator Figure 3: XL Series Positioner Mounted on Fisher 657 Actuator Calibration is easy using the XL positioner due to minimal interaction between zero and span. Also, the
Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611 55-1 Valtek VL-UHC Spring Cylinder Linear Actuators GENERAL INFORMATION The following instructions are designed to assist in installing, troubleshooting and servicing Valtek VL-UHC spring cylinder actuators. Product users and mainte-nance personnel should thoroughly review .
valve controllers. Valtek control products are also known for handling the most severe services: cryogenic, superheated steam, volatile and corrosive fluids, erosion, high pressure drops, vibration, cavitation, flashing, and high noise levels. Valtek valves are equipped with spring cylinder actuators that provide the thrust and speed necessary .
Valtek Rotary Actuators Performance Torque Producing Capability Valtek spring cylinder rotary actuators produce sub-stantially higher torque than comparable diaphragm actuators because the cylinder operates with supply pressures up to 150 psi. Throttling diaphragm actua-tors are limited to 40-60 psi, thus decreasing their torque-producing .
The Valtek Mark One is the industry choice for a simple, reliable, tough globe valve. The Valtek Mark One TM globe control valve offers superior performance in liquid and gaseous services, while also permitting easy, fast and inexpensive maintenance. Unlike diaphragm-operated control valves, the spring-cylinder actuated Mark One provides .
Valtek's first choice of bellows seals for installation in Valtek Mark One valves. The Guardian can handle temperatures between -320 and 650 degrees Fahrenheit and pressures to 400 psi. The typical cycle life for Valtek's basic design when throttling between 25 and 75 percent open is 200,000 cycles. Figure 3 shows the
Piston / Cylinder Cylinder actuator should be applied when the process requires the following: 1. Double acting 2. Field reversible 3. Light weight, compact design 4. High stiffness (for throttling near seat) 5. Actuation speed 1 sec. 6. High supply pressure 50 to 150 psi 7. Interchangeability with Valtek rotary products (Vald-
Valtek Control Products Spring Cylinder Linear Actuator FCD VLENTB0002-15 – 04/07 flowserve.com The VL series is the standard set of actuators for Valtek control valves, providing precise control and reliable perfor-mance. With decades of experience and reliability, VL actua-tors have been known to be in service for over 30 years.
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