Limitorque - Flowserve
flowserve.comLimitorque LRPLimitorque Rack & Pinion Pneumatic Actuator1
LRP Limitorque Rack and Pinion Actuator SeriesLimitorque is the brand customers trust when safe, reliable and robust valve automation is demanded in the most arduous operatingconditions. Used in a vast range of industries, including oil and gas, petrochemical, power generation, pharmaceutical, and steel production, the Limitorque range of electric, scotch yoke and rack and pinion actuators guarantee precision valve control in challengingapplications.The Limitorque LRP provides durable functionality and prolonged service life through unique features such as piston support rodswithin the actuator, ensuring that side loads generated by the pistons are transmitted through bearings in the end cap and not thebody. This eliminates the need for the body to be used as a loadbearing surface and promotes longer service life. The support roddesign of the Limitorque LRP actuator distinguishes it from the standard rack and pinion design and offers reliable operation, performance stability and longer service life.In addition to offering improved operational safety and ease of maintenance, the modular LRP design provides greater applicationflexibility for easy fitting and interchangeability of ancillary equipment, making it one of the finest pneumatic actuators available today.Key BenefitsRobust design for durable functionality and maximum ease of use Balanced double rack and pinion provides a linear torque curvewith a large range of sizes for efficient torque matching Mounting to ISO 5211 pattern and DIN 3337 female star driveprovides common and simple actuator to valve attachment Position indicator - provides highly visible external indication ofvalve position Foolproof location pin for correct assembly Multi-spring concept - allows variable torque/air pressure requirements from the same actuator by changing spring quantity Namur VDI/VDE 3845 top mounting pattern - for easy fitting andinterchangeability of switches, positioners, etc Namur VDI/VDE 3845 end-cap solenoid mounting pattern - facilitates interchangeability of solenoids or direct port connections Compact fail-safe size as per double-acting - minimizes spacerequirementsReduced maintenance and Longer Service life Anodised aluminium construction - for anti-corrosion and superior wear performance on internal surfaces, plus stainless steelfasteners and corrosion-protected springs One piece steel pinion drive with full width piston tooth engagement - for greater operational lifeIncreased plant and personnel safety For fail-safe operation in a fire, polished support rods retain firesafe capability even if bearings are fire damaged Blow-out proof pinion - eliminates risk of pinion ejection evenafter pinion retaining ring is removed Unique unrestricted air flow through support rods gives fastoperation speeds as standard - and also provides greater safety(center chamber cannot be pressurized with end cap removed) Long end cap screws allow complete release of spring energy forsafe removal of end caps.2
flowserve.comOperating PrincipleThe LRP pneumatic actuator is based on the opposed double rack and pinion principle but utilises unique support rods to transferair between the chambers of the actuator and minimise friction and wear between pistons and body boreDouble Acting ActuatorsIn the double acting model, compressed air is applied to Port 1,which is fed via the large bore support rod into the centrechamber. This forces the pistons apart and turns the actuator's output drive anti-clockwise (seen from above) for valveopening, simultaneously venting the air in the end chambersvia the second support rod through Port 2. This operationcan be reversed by supplying air into Port 2 for clockwiserotation (valve closing).Spring Return ActuatorsWith the fail-safe spring return model, air is applied in a similar way to Port 1 for anti-clockwise operation (valve opening)and the movement of the pistons compresses the springsheld in the end chambers of the actuator. This position willbe maintained until air pressure is released when the springforce closes the pistons together for clockwise operation(valve closing).Spring Return ActuatorsDouble Acting ActuatorsDOUBLE-ACTING ACTUATOR F39TOP VIEWTOP VIEWPort 1PORT 1SUPPLYAIRAIRSUPPLYSPRING-RETURN ACTUATOR F39STOP VIEWTOP VIEWPORT22PortVENT OUTAIR EXHAUSTOPENING STROKETOP VIEWTOP VIEWPORT 2Port2VENT OUTAIR EXHAUSTOPENING STROKEPort1PORT 1EXHAUSTAIRAIREXHAUSTTOP VIEWTOP VIEWPORT 2PortVENT2INAIR SUPPLYCLOSING STROKEPort 1PORT1AIRSUPPLYAIR SUPPLYPort 1PORT 1AIREXHAUSTAIR EXHAUSTPORT 2Port2VENT INVENT INCLOSING STROKEParts List/Material SpecificationsPosition IndicatorSupport RodsSpringsEnd CapsPistonsThread SealsNote: Product label is attached toopposite side of body.BodyPinionLimit StopsEnd Cap nd CapsSupport rodsBearingsO-RingsEnd Cap ScrewsSpringsPosition IndicatorLimit StopsThread SealsMaterial/FinishAluminium (extrusion) anodisedCarbon Steel (corrosion resistant coated)AluminiumAluminium anodisedStainless SteelAcetalNitrile RubberStainless SteelChrome Silicon Steel (corrosion resistant coated)PolyethyleneStainless Steel (Sizes 40 to 50 carbon steel plated)Bonded Nitrile and Steel (corrosion resistant coated)3
Additional InformationWorkingPressure8.3 bar (120 psig) Maximum. For higherpressures contact our sales office.MediaAir or non-corrosive fluidStandard -20 C to 100 CTemperatureLow temperature variant -40 C to 85 C*RangeHigh temperature variant -20 C to 150 CATEXConforms to ATEX 2014/34/EU under equipment group II, category 2 (non-mining)SILCertified to IEC61508 to SIL level 3 capabilityRotationWhen viewed from top, piston rotates anti-clockwise whencentre chamber supply port 1 is pressurised (see page 3)Limit Stop: Nominal 96 total travel including nominal 3 adjustable overtravel and adjustable 10 undertravelboth clockwise and anti-clockwise.Mounting ConfigurationsSolenoid: EN15714-3 VDI/VDE 3845 mounting patternTop Mount Interface: EN15714-3 VDI/VDE 3845 mounting patternActuator/Valve Interface: ISO 5211 pattern with DIN3337 Star drivepinion (female)* Please contact Technical Sales for options down to -40 CActuator SizingThe torque tables detailed below provide actual torque values for the range of actuators at typical pressure and springconfigurations. When sizing a valve, we recommend that a factor of safety is applied to its nominal torque. Please contactTechnical Sales for further advice.Double Acting ActuatorsFor a given air supply pressure the double acting actuator provides a linear (constant) torque output throughout its rotation (seechart below).Double Acting Actuator Output Torque Nm (lbf/in)Size RP-404Operating Pressure barg 433921867767310639408169715018
flowserve.comSpring Return ActuatorsThe table below shows actuator start and end torque by air and by spring, valid for both fail open and fail close configurations.During sizing, ensure that the actuator has sufficient torque to open and close the valve.Spring return Actuator Output Torque Nm (lbf/in)Size /SeriesSpringNumberStrokeofSprings Start 37352.5 bar (g)29 psi (g)Start .0 bar (g)36 psi (g)Start 3.5 bar (g)44 psi (g)Start End4.0 bar (g)51 psi (g)Start EndAir Stroke4.5 bar (g)58 psi (g)Start 6407756641251106762171503127447416807085.0 bar (g)65 psi (g)Start End5.5 bar (g)80 psi (g)Start End6.0 bar (g)87 psi (g)Start End7.0 bar (g)102 psi (g)Start 13111982988677364653469114100969611130115184743163 1151443 101810592972637157138998867184 1231628 108916391190 116 217 141 270 1921443 805 1682 1027 1920 1248 2390 1699171 113 224 1631513 1000 1982 144317896231 145 283 1951575 850 2044 1283 2505 1726238 127 290 177 3432106 1124 2567 1566 30362972628217 149 281 2101920 1319 2487 1859228 132 293 193 357 2542018 1168 2593 1708 3159 2248304 176 369 237 4332690 1558 3266 2097 38323813372345 219 447 3163053 1938 3956 2797363 184 465 281 568 3773213 1628 4115 2487 5027 3336483 245 586 342 6894275 2168 5186 3027 609860453452262000159 250 209 402 258 510 3571407 2213 1850 3558 2283 4514 31592982637220 445 281 509 342 638 4631947 3938 2487 4505 3027 5646 40984393885306 707 403 810 500 1015 6942708 6257 3567 7169 4425 8983 61425
Dimensions Size 10 to 40 (mm)S80.030.0U HOLES4 POSITIONSM5 x 6.0 DEEP4 POSITIONSM6 x 14.0 DEEPFrom TOP FACENAMUR SLOT14.0 M6 REF.NAMURSLOTEN 15714-3 NAMUR TOP ACCESSORY MOUNTINGG1/8 (Size 10)G1/4 (Sizes 15-50)MIN./FRA TNUSTAR DRIVEEN ISO 5211QHE A/FX.KEYVENT PLUG(SPRING RETURNACTUATORS)THIS HOLE ONLYEN 15714-3 NAMURINLET ENDCAPLIMIT STOP ENDCAPEN ISO 5211 F PATTERNG PCD H HOLESI REF.J A/F*I REF.SEN TARIS DRO IV52 E11U HOLES4 POSITIONSACTUATOR MOUNTINGATTACHMENT EN ISO 5211Size /SeriesBasic DimensionsABCDBottom ISO Mounting DimenionsEFGLRP-10 155,3 77,7 76,8 85,5 42,8F04 42,0LRP-15 195,3 97,7 94,0 104,0 52,0F05 50,0LRP-20 235,4 117,7 116,0 125,0 62,5F07 70,0LRP-25 271,0 135,5 135,5 146,6 73,5F07 70,0LRP-30 325,1 162,6 155,0 167,5 83,8F10 102,0LRP-33 398,7 199,4 206,0 214,0 107,0 F12 125,0LRP-35 423,9 212,0 213,0 217,0 108,5 F12 125,0LRP-40 511,8 255,9 244,9 276,0 149,0 F14 140,0Dimensions in mm6HM5 x 0.256.25 DPM6 x 0.307.5 DPM8 x 0.4010.0 DPM8 x 0.4010.0 DPM10 x 0.5012.5 DPM12 x 0.7018.0 DPM12 x 0.6316.0 DPM16 x 0.9524.0 DPIJTop PinionKNLimit StopLMO29,7 11,0 12,015,09,020,0 16,035,4 14,0 16,0PQAncillary HoleRST10,0 4,0 13,073,031,816,0 12,6 20,0 13,911,0 4,0 13,073,031,849,5 17,0 19,020,3 12,6 20,0 13,815,0 5,0 17,0107,2 49,249,5 17,0 19,019,0 19,0 30,0 22,221,0 6,0 19,0107,2 49,272,1 22,0 24,022,1 22,1 30,0 21,923,0 6,0 19,0161,1 73,088,4 27,0 29,028,5 28,5 30,0 21,223,0 8,0 24,0161,1 86,088,4 27,0 29,028,5 28,5 30,0 20,930,0 8,0 24,0212,7 101,699,0 36,0 40,034,9 34,9 50,0 37,027,0 10,0 30,0243,6 117,5UM5 x 0.256.3 DPM5 x 0.246.0 DPM6 x 0.277.0 DPM6 x 0.410.0 DPM6 x 0.410.0 DPM8 x 0.513.0 DPM8 x 0.614.0 DPM10 x 0.615.0 DP
flowserve.comLRP Actuator Selection TableA - NBR BunaU - VITON R - Low Temp. NitirileZ - SPECIALFC 10-FC - FAIL CLOSE (SPRING CW)FO - FAIL OPEN (SPRING CCW)D2 - DOUBLE ACTINGLZ Example model no10LZ - epoxy paint8LG - Limiguard anodization6430Optionen2025-N. of SpringsFrame Size1510AFail Action10-Seal MaterialLRPLP - PVC coatedLQ - Quick actingLB - BSPP ports333540Technical InformationSize / SeriesOperating Speed (Seconds) Actuator with noload using Namur solenoid at 5.5 bar (g)Actuator Free InternalVolume LitresWeights(Kg)Double ActingSpring Return(Open)Spring Return(Close)OpenClose(DA only)Double ActingSpring pecial OptionsFinishesThe LRP actuator is available in a variety of special finishes to meet specific application needs. The Limiguard coating provides aspecial anodised finish for enhanced protection in highly corrosive or salt water atmospheres. Flowserve also offer epoxy paintfinishes and colours to customer requirements.Fast ActingA fast acting version can be achieved by providing direct air feed to the centre chamber and adding dump valves for air exhaust.On size 40 a large Namur solenoid mounting can be specified and mounted to the end cap.7
ItalyFlowserve Limitorquevia Rio Vallone 17208 B 3 Mezzago (IM 18)1 ItalyPhone: 39 039 6 2060 1Fax: 39 039 6 2060 213Email: lfpsinfo@flowserve.comChinaFlowserve Suzhou Operations49 Weixin Road, SuzhouChina, 215000Phone: 86-512-62881711Fax: 86-512-62888737FCD LFENBR0009-00-A4 02/17Contact:For more information about Flowserve Corporation, visitwww.flowserve.com or call USA 1-800-225-6989.USAFlowserve US, IncValve Automation Center14219 WestfairWest I Houston, Texas 77041Phone: 281-671-9209Email: VACHouston@flowserve.comFlowserve Corporation has established industry leadership in the design and manufacture of its products. When properly selected, this Flowserve product is designed toperform 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 innumerous applications under a wide variety of industrial service conditions. Although Flowserve can (and often does) provide general guidelines, it cannot provide specific dataand warnings for all possible applications. The purchaser/user must therefore assume the ultimate responsibility for the proper sizing and selection, installation, operation, andmaintenance of Flowserve products. The purchaser/user should read and understand the Installation Operation Maintenance (IOM) instructions included with the product, andtrain its employees and contractors in the safe use of Flowserve products in connection with the specific application.While the information and specifications contained in this literature are believed to be accurate, they are supplied for informative purposes only and should not be consideredcertified or as a guarantee of satisfactory results by reliance thereon. Nothing contained herein is to be construed as a warranty or guarantee, express or implied, regarding anymatter with respect to this product. Because Flowserve is continually improving and upgrading its product design, the specifications, dimensions and information containedherein are subject to change without notice. Should any question arise concerning these provisions, the purchaser/user should contact Flowserve Corporation at any one ofits worldwide operations or offices. 2017 Flowserve Corporation, Irving, Texas, USA. Flowserve and Limitorque are registered trademarks of Flowserve Corporation.8
End Cap Screws Operating Principle Double Acting Actuators In the double acting model, compressed air is applied to Port 1, which is fed via the large bore support rod into the centre chamber. This forces the pistons apart and turns the actua-tor's output drive anti-clockwise (seen from above) for valve
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.
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.
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 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
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
- Engineering (hydraulic calculations, design, Flowserve) - Delivery of two new pumps, with modified hydraulics, as per API 610, 12th edition, ATEX certified (Flowserve) - Delivery of two API 53B/23 seal support systems (Flowserve) - Delivery of two dual, metal bellow mechanical seals (Flowserve) - Delivery of new couplings (John Crane)
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.
