Flowserve Limitorque Actuation Systems
Limitorque QXThe Next Generation in Smart Quarter-turn ActuationExperience In Motion
Flowserve Limitorque Actuation SystemsLimitorque is an operating unit of Flowserve, a 4 billionplus/year company strongly focused on automation andsupport of the valve industry. Flowserve is the world’spremier provider of flow management services.Limitorque has evolved over 80 years since its strategicintroduction of a “torque-limiting” design that changedan industry. Flowserve Limitorque offers solutions andautomation choices for customers that provide: Cost savings from field devices such as electric valveactuators Greater operating efficiencies from control-roomperformance sequencing, interlocking and continuousprocess optimization Competitive advantages derived from increasedmanagement visibility of databases and networksLimitorque is one of the primary reasons Flowserve is“Experience In Motion.”2
flowserve.comThe QX speaks yourlanguage, whetherit’s management,technical, financial,operations or service.Limitorque QX Smart Valve ActuatorThe full measure of safety and reliability in thenext-generation smart quarter-turn actuator.The Flowserve Limitorque QX quarter-turn smartelectronic valve actuator continues the legacy of theindustry’s state-of-the-art, non-intrusive, multi-turn MXactuator by including an absolute encoder for trackingposition without the use of troublesome batteries. The QXdesign provides enhanced safety and reduced downtimethrough improved diagnostics, built-in self-test (BIST)features and LimiGard fault protection.The QX design builds on more than 10 years of experiencewith proven Limitorque MX technology—the firstgeneration double-sealed electronic valve actuator fromFlowserve designed to provide control, ease of use andaccuracy. The QX includes all the user-preferred featuresof the MX in a quarter-turn smart actuator package.It is the only non-intrusive, double-sealed quarter-turnactuator to display the Limitorque brand.3
QX: The Next Generation in Smart Quarter-turn ActuationSpeed, Precision and SimplicityThe QX control panel features an improved 32-characterLCD screen that provides actuator status and diagnosticsin an easy-to-use, easy-to-read, graphical format. Theindustry’s first non-intrusive, quarter-turn multilingualactuator is configurable in English, Spanish, German,French, Italian, Portuguese, Mandarin, Russian, BahasaIndonesia and Katakana as standard configurationlanguages. In addition, the LCD can be rotated 180º forbetter field visibility.User friendliness, precision, simplicity, and intuitive setupare characteristics expected of a smart actuator. Users andvalve OEMs demand quick setup and easy-to-understanddialogue in preferred languages. The ability to eitherupload new software or download diagnostics is alsocritical to improving a plant’s efficiency. The QX providescustomers with the essential tools for rapid installationand root-cause diagnostics.Precision is expected in a smart actuator. The MX was thefirst such device developed with an absolute encoder thatdoesn’t require troublesome and unpredictable battery4backup. Flowserve Limitorque’s innovative absolute encodertechnology, developed for the MX, is used in the QX. TheQX encoder employs system-on-chip technology usinga contactless magnet that excites Hall-effect devices toprovide redundant, 12-bit resolution over 360 degrees. Thisredundancy, part of the BIST (built-in self-test) feature,means the device can continue to function reliably until anumber of faults have been accumulated.When a device is designed for BIST, its methodology is suchthat much of the test functionality is embedded in the deviceitself. BIST design enables a critical component’s abilityto communicate its actual state to a CPU for comparisonto the expected state. Any deviation from expected valueswill be reported to the user, with correlation to the failedcomponent or subsystem.Simplicity is expected in a smart actuator. In fact, one ofthe reasons for using an electronic actuator is the simplicityof setup, installation on a valve and acquiring diagnosticinformation. The QX is the simplest and easiest to useelectronic quarter-turn actuator.
flowserve.comLong Life and ProtectionLong life is expected in a smart actuator. There are morethan 1,000,000 Limitorque actuators installed around theglobe, in every conceivable environment. Many have beenfunctioning for over 50 years. This legendary Limitorquelongevity has been carried over into the QX family ofsmart actuators. The QX has been developed with theruggedness and dependability users have come to expectfrom Limitorque actuators for better than 80 years.In order to last a long time in severe environments, smartactuators must have unparalleled protection. The QX’sIP68 enclosure rating is 20M for 168 hours, regardless ofwhether the unit is weatherproof or explosion-proof. Thisis an industry-leading feature. Add other certifications tothe list – NEMA 4, 4X, 6 – and the QX is unsurpassed inunit protection.The QX is double-sealed, which isolates the terminalcompartment from the controls environment. Anyleakage into the terminal compartment is containedin the compartment.The QX is powder coated using a polyester resin inDupont Blue Streak color, not only for aesthetics, butalso for protection in severe corrosive environments.The use of powder coating ensures that each QX canwithstand saliferous conditions without degradation.Quality and CertificationsFlowserve Limitorque is a global leader in qualitymanufacturing. All Limitorque plants are certified to ISO9001 standards, the recognized benchmark for qualityall over the world. The same unexcelled use of certifiedmaterials is found in the QX as in Limitorque’s naval andnuclear-qualified electric actuators. The MX has usedsynthetic gear oils especially optimized for use withworm-gear sets since the first unit was shipped in 1997,and the QX is no exception. All lubrication used in theQX is synthetic, capable of temperature extremes from-60ºC to 70ºC. The MX was the first non-intrusiveactuator to use rolled worms and electronic controlsdesigned and produced using surface-mount technology:the QX uses components manufactured with the sameadvanced technology. A true globally certified device,the QX meets all pertinent European directives includingATEX, EMC, Machinery and Noise, and displays the CEmark associated with such compliance.5
Anatomy of QX Quarter-turn ActuatorsLimitorque QX actuators respond to customer needs with advanced features designed forease of commissioning and use, as well as time- and money-saving operational benefits.What sets the QX apart is the combination of control and reliability enabled by advancedLimitorque technology, plus superior ergonomics and human interfaces for speed,comfort, and ease of use.Brushless DC MotorAdvanced brushless DC motors eliminatesparks, reduce mechanical and electricalnoise, and dissipate heat better than brushedmotors. Unique to the industry, brushlessmotors last longer than conventional motorsand allow for more accurate positioningwhile permitting a global range of voltages(single-phase and three-phase AC and DC)to be used without modification.Terminal ChamberDouble-sealed design provides a terminationchamber that is separate and sealed fromthe control chamber. Control componentsare never exposed to the elements during sitewiring or because of a faulty cable connection.Absolute EncoderThe QX encoder employs system-on-chiptechnology using a non-contacting magnetto excite Hall effect devices, providingredundant, 12-bit resolution over 360 .This redundancy, part of the BIST feature,means the device can continue to functionreliably until a number of faults havebeen accumulated.Worm Gear Set and Motor Gear AttachmentBoth the motor gear reducers and wormgear sets are designed with Limitorqueperformance and longevity in mind. Rolled/ground gears are bearing supported andimmersed in an extended life syntheticgear oil specifically designed to improveefficiency and minimize wear.Drive Sleeve StopDrive sleeve stops are supplied for 90 selections and removed for multi-turnapplications, up to 20 turns maximum.6Cast Aluminum HousingThe QX housing material is cast 356-T6 gradealuminum. This alloy was selected due to itssuperior suitability for corrosion resistance inharsh and eroding environments.Brushless DC MotorTerminal ChamberAbsolute EncoderWorm Gear SetDrive Sleeve StopCast Aluminum Housing
flowserve.comDeclutch LeverDeclutch lever enables the QX actuator to beplaced in manual, handwheel-drive operation.Lever automatically disengages when motoris energized and can be padlocked in themotor position.Torque SensingThe QX continues the Flowserve Limitorquecommitment to fully electronic smartactuators with advanced torque sensing.This method of torque control uses motoramperage to sense the valve load andhas been verified in temperature extremesfrom -60 C to 70 C.Declutch LeverHandwheelQX handwheels are manufactured from anengineered resin and are designed to meetmost minimum rim pull requirements.Locating the handwheel adjacent to the LCDand controls facilitates local configurationand operation.Motor Gear SetHandwheelControl ChamberUtilizing the same electronics packageas the state-of-the-art MX, the QX hasan additional feature - a solid state motorcontroller. This design permits almostall customer supplied voltages, single orthree phase AC or DC, to be connectedwithout modification to the voltage supply.Control ChamberLCD MultiIingual DisplayLocal Control SwitchesLCD MultiIingual DisplayThe control panel display delivers instant,up-to-the-minute actuator status andvalve position in 10 languages. It alsoprovides simple calibration and diagnosticinformation, including motor, identification,and hardware data, as well as torque profileand log reports.Local Control SwitchesLocal control switches make setup andcalibration easy, using “yes” or “no”responses to straightforward questions,plus they provide the ability to open,stop and close the actuator and to selectremote or local preferences. These switchesare magnetically coupled, solid-state Halleffect devices, which eliminate troublesomeand fragile reed switches.7
Control and DiagnosticsControl is expected in a smart actuator. The QXsimplifies valve automation in three critical methodsof control:Switch KnobMagnetic FieldMagnetic Field Calibration/setup Normal operation Diagnostics and troubleshootingThe MX was the first non-intrusive actuator to equip userswith LCD dialogue screens in the language of their choice.The QX has the same language options as the MX and usesa graphical dot matrix display that improves the visibilityof the display. The use of this type of LCD permits thesupport of any language. In fact, in addition to English,Spanish, German, French, Italian and Portuguese, the QXalso includes four character-based languages – Mandarin,Russian, Bahasa Indonesia and Katakana – with a capacityfor even more.Simple “Yes” and “No” responses to dialogue questionsconfirm the setup of the QX via solid-state Hall effectdevices in both knobs. No special tools or remote devicesare required. And the QX is “fit for service”, offering thewidest range of configuration menus of any non-intrusivesmart actuator.8Unit “Opens”NOTE: Illustration forinformation only.Unit “Off”Hall effect devices interlockedto prevent operationDiagnostics should be easy to read and decipher. TheQX diagnostic enhancements now offer a BIST (built-inself-test). The BIST feature is also designed into a stateof-the-art controls platform that verifies and validates theintegrity of its components. The result is a design thataids the user in meeting the SIL (Safety Integrity Level)requirements of IEC 61508. Placing a smart device into anyplant system enhances the ability of a given safety system toachieve its preferred SIL rating. Any device that incorporatesfully developed BIST features provides assurance to the userthat the device has been designed with plant-wide safetyand integrity of operation in mind.
flowserve.comDeclutch LeverThe “View Diagnostics” menu selections now include moredefinitive routines that can isolate troubleshooting to “rootcause” error codes. These root-cause codes can be used inconjunction with BIST. A well-designed BIST-based systemcan do more than just report failures in the electronicsubsystems: it can also determine failures or predict futurefailures in its associated mechanical system.The QX also offers Bluetooth technology as an option,up to 10 meters. When used with the Flowserve Limitorquegraphical software interface, Dashboard , diagnosticinformation can be transferred easily to a PDA withWindows Mobile 5 or greater, laptop computer or smartcell phone. In addition, off-line configuration changes canbe uploaded and actuator configurations transferred fromone device to any number of subsequent actuators.Three conduit openings arestandard with the option ofa fourth.Terminal Compartment with O-ringseals that permit a double-sealedcompartment, isolating the electroniccontrols from the environment.9
Nothing Exceeds Limitorque QX Actuators for Ease andCompatibility with Quarter-turn Valves of All TypesValvesLimitorque QX actuators have been designed toaccommodate today’s wide variety of valve designsand configurations and meet international standardsfor valve and actuator interfaces, including ISO 5210and MSS SP-102.Direct mounting: The QX can be directly coupledwith all quarter-turn valves for position seated ortorque-only applications.CouplingsStandard B4/B4E BaseThe standard QX actuator base includes a mounting base for torque-only or position-seated valves. It also includes a steel torque nut,which may be machined to fit a valve or, if necessary, gearbox. A B4E torque nut can be provided and may be installed to allow forextended stem acceptance.Available QX FlangesFlange 1Flange 210QX-1QX-2QX-3QX-4QX-5ISO 5210F05/F07F07F10F12F12MSS SP-102FA05/07FA07FA10FA12FA12ISO 5210F10F10F12F12F14F14F14FA12FA12FA14FA14MSS SP-102FA10 (STD)FA10 (STD)FA14
flowserve.comIntegrity and Predictable PerformanceSmart actuators should have enabling technologies that ensure integrity and dependability.The QX offers three.Limigard — now with BIST and FDAEnhanced reliability for optimal plant operations andreduced troubleshooting costs are the primary benefits ofLimitorque’s smart actuator monitor, LimiGard.When LimiGard wiring diagrams are followed, LimiGardcontinually monitors the motor controller, internal logiccircuits and external command signals, comparing themto reference conditions. This virtually eliminates thepossibility that an actuator malfunction can occur withoutprompt detection and alarm communication. In the eventof a malfunction, LimiGard takes over and supervises theactuator’s response characteristics, maximizing safety andpredictability.A state-of-the-art electronic actuator, such as the QX,includes means for verifying and validating that itscomponents are designed with built-in self-test (BIST)capabilities. Selecting the QX, which incorporates a highlevel of BIST, can contribute greatly to the integrity andreliability of process applications and enhance the ability ofa safety system to achieve its highest possible SIL rating.LCDKNOBL-O-RDiscreteInputsCustomer plyMotor Speedand TorqueControllerRotator PositionFeedbackBLDCMotorPositionEncoder11
Absolute position encoderLimitorque was the first to use absolute encoders insmart electronic actuators. An absolute encoder simplifiesvalve automation from configuration and setup intonormal operations, diagnostics and troubleshooting. TheQX encoder employs system-on-chip technology usinga contactless magnet that excites Hall-effect devices toprovide redundant, 12-bit resolution over 360 degrees. Thisredundancy, part of the BIST features, means the device cancontinue to function reliably until a number of faults havebeen accumulated.As the actuator turns, a mechanical coupling rotates themagnet about an array of several Hall-effect devices. Whenthe magnet passes over a Hall-effect device, it causes achange in the electromagnetic field, and a digital signature(on-off) is developed. This signature is duplicated across thearray of Hall-effect devices at specifically timed intervals,resulting in digital values that calculate the position of thevalve via the electronic actuator.Torque sensingTorque limiting has been a Limitorque feature for betterthan 75 years. In fact, the name Limitorque was coined toidentify the ability of an electric actuator to “limit torque”to a valve. In the past, electromechanical actuators havesensed torque using a complicated system of springs,switches and cams. The QX senses torque electronicallyfor use in valve control, overload protection and torquetrending. In conjunction with the Limigard feature, torque issensed from motor current, with compensation performedfor voltage and temperature variations. The result is highlyreliable and predictable torque sensing without the need forthe extra components associated with electromechanicaltorque switches. The QX is a true smart que decision
flowserve.comQX Control, Indication, Protection and Optional FeaturesStandard features Direct-wired remote control – Wiring flexibility includesthe following standard alternatives to open-stop-close theactuator:– Four-wire – Valve can be opened, closed or stopped.– Two-wire switched – Single open or closed contact;valve can be opened or closed but not stopped.– Three-wire maintained – Two momentary contacts forself-maintained control. Valve can be opened or closedbut not stopped in mid-travel.– Three-wire inching – Two “push-to-run” contacts; valvecan be opened, closed and stopped in mid-travel. Multi-mode Control – Three modes of remote control arepermitted when the QX is configured for multi-control:digital (discrete) control, analog control or network(fieldbus) control. The QX will respond to the last commandreceived. However, analog (modutronic) control is initiatedby either toggling QX User Input 2 (configured for CSEinput) or removing and reapplying the 4-20 mA analogsignal. Refer to LMENTB2300 for further information. Monitor relay – Provides a N/O and N/C contact representing“Actuator available for remote operation.” Emergency Shutdown (ESD) – Up to three remote, externalESD signals may be applied to the actuator to movethe valve to a predetermined, user-configured shutdownposition, overriding existing control signals. User-defined inputs – Three user-defined inputs are supplied. Inhibit signals – External signals may be used to inhibitactuator opening, closing or both. Control signals – The control signal can be either 24 VDCor optional 110 VAC; it can be sourced from the actuator orcustomer supply. Status contacts (two pairs) – May be set to represent up to25 actuator conditions. Alternate speeds – The QX can be configured to permitdiffering speeds for Open or Close direction.Protection features Autophase protection and correction – Ensures properopen/close directions and monitors and corrects phasing ifconnected improperly. Prevents operation if a phase is lost. Jammed valve – Automatically initiates a forward/reversecycle to free jammed valves. Instantaneous reversal protection – Incorporates a timedelay between the motor reversals to reduce current surges. Motor thermal protection – A thermistor, placed within themotor, protects against overheating. LimiGard circuit protection – QX actuators includeLimiGard circuit protection. LimiGard consists of dedicatedcircuitry that continually monitors the motor controller,control relays, internal logic circuits and external commandsignals. When the recommended wiring connections aremade, it virtually eliminates unexpected, erroneous actuationcaused by internal electronic failures and erratic externalcommand signals. Additionally,
Flowserve Limitorque is a global leader in quality manufacturing. All Limitorque plants are certified to ISO 9001 standards, the recognized benchmark for quality all over the world. The same unexcelled use of certified materials is found in the QX as in Limitorque’s naval and nuclear-qualified electric actuators. The MX has used
Limitorque is an operating unit of Flowserve, a 4 billion-plus/year company strongly focused on automation and support of the valve industry. Flowserve is the world's premier provider of flow management services. Limitorque has evolved over 80 years since its strategic introduction of a "torque-limiting" design that changed an industry.
The Flowserve Limitorque QX quarter-turn and MX multi-turn electronic valve actuators lead the industry in quality, safety and ease of use. Both models provide the user with predictable, reliable and safe operation plus extended service life, in the most rigorous applications and extreme environments. Limitorque Electric Actuators
Flowserve brands for most common control accessories: Flowserve Solutions In addition to providing actuators and controls designed to meet or exceed all of today’s rigorous requirements, Flowserve and Limitorque lead the industry with all of the essential related solutions that our customers need to maintain peak efficiency and productivity.
Flowserve Corporation has established industry leadership in the design and manufacture of its products. When properly selected, this Flowserve product is designed to perform its intended function safely during its useful life. However, the purchaser or user of Flowserve products should be aware that Flowserve products might be used
L120 Installation & Maintenance Manual 120-11000 Revision E September 2002 1-1 Flow Control Division Limitorque Actuation Systems 1 Introduction 1.1 Purpose This Installation and Maintenance Manual explains how to install and maintain the L120-10, L120-20, and L120-40 actuators.
manual overrides and control panels, like hydraulic power units, accumulator racks, self-contained units and other electro-hydraulic solutions. Limitorque also provides engineering design services for mounting hardware, ensuring that your actuation solution is ready to handle the toughest challenges. * For higher torque ranges, consult factory.
9 Hex Nut Carbon Steel Spring Rod 10 End Flange Carbon Steel Spring 11 Guide Ring PTFE Graphite 12 O-Ring NBR 13 Split collar Alloy steel. LHS Standard aterials of Construction. Hex Nut 15 O-Ring. Anatomy of Limitorque LDG Actuator. The LDG range of Limitorque Gas Powered actuators is a robust, modular Scotch yoke design, available in both
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