Valtek VL-UHC Spring Cylinder Linear Actuators
Valtek VL-UHC Spring CylinderLinear ActuatorsGENERAL INFORMATIONUnpackingThe following instructions are designed to assist ininstalling, troubleshooting and servicing Valtek VL-UHCspring cylinder actuators. Product users and maintenance personnel should thoroughly review this bulletinprior to installing, operating or disassembling theactuator. Separate installation, operation and maintenance instructions cover additional features (such ashandwheels, limit stops, fail-safe systems or limitswitches).While unpacking the actuator, check packing list againstmaterials received. Lists describing the actuator andaccessories are included in each shipping container.This publication does not contain information onFlowserve positioners. Refer to the appropriate installation, operation and maintenance instructions forinstalling, maintaining, troubleshooting, calibrating andoperating Flowserve positioners.To avoid possible injury to personnel or damage to valve parts, WARNING and CAUTIONnotes must be strictly followed. Modifying thisproduct, substituting non-factory or inferiorparts or using maintenance procedures otherthan outlined could drastically affect performance, void product warranties and be hazardous to personnel and equipment.WARNING: Standard industry safety practicesmust be followed when working on this or anyprocess control product. Specifically, personalprotection and lifting devices must be used aswarranted.Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 86111. Position the lifting straps and hoist to avoid damageto the tubing and mounted accessories when liftingthe actuator from the shipping container.WARNING: When lifting an actuator with liftingstraps through the yoke legs, be aware thecenter of gravity may be above the liftingpoint. Therefore, support must be given toprevent the actuator from rotating or causingserious injury to personnel or damage tonearby equipment.2. Contact your shipper immediately in the event ofshipping damage.3. Contact your Flowserve representative for anyproblems.InstallationPrior to installation, make sure adequate overheadclearance for the actuator is provided to allow for properremoval from the valve body and for proper maintenance. Refer to Table 1.NOTE: If the actuator is attached to a valve bodyassembly, see Approprate Installation, Operation andMaintence instructions for overhead clearances.55-1
Table 1:Overhead Clearance for DisassemblyActuator Size2550100Minimum Clearance6 inches8 inches9 inches1. Connect the air supply and instrument signal airlines to the two appropriately marked connectionson the positioner. Since both the cylinder andpositioner are suitable for 150 psi (10.3 bar) airsupply, an air regulator should not be used unlessthe supply exceeds 150 psi (10.3 bar).NOTE: In some cases, air supply must be limited to100 psi (6.9 bar) rather than 150 psi (10.3 bar); thiswill be indicated by a sticker found near the upper airport on the cylinder.WARNING: To avoid personal injury or equipment damage, do not exceed recommendedsupply pressure.2. Installation of an air filter on the supply line isrecommended.3. Use a soap solution to make sure all air connectionsare leak free.MAINTENANCEAt least once every six months, check for properoperation by following the preventative maintenancesteps outlined below. These steps can be performedwhile the actuator is in service and, in some cases,without interrupting service. If an internal problem issuspected with the actuator, refer to the “Disassemblyand Reassembly” section. It is reccomended that all softgoods are replaced every four years or 500,000 cycles,whichever comes first.1. Examine the actuator for damage caused bycorrosive fumes and process drippings.2. Clean the actuator and repaint any areas of severeoxidation.3. If possible, stroke the actuator and check forsmooth, full-stroke operation.WARNING: To avoid serious injury, keep hands,hair and clothing away from all moving partswhile operating the actuator.4. Make sure positioner mounting bolts, linkage andstem clamp are securely fastened.5. Ensure all accessories, brackets and associatedbolting are securely fastened.6. If possible, remove air supply and observe actuatorfor correct fail-safe action.7. Check rubber bellows for wear.8. Spray soap solution around the cylinder retainingring, the adjusting screw and the lower actuator55-2stem bushing to check for air leaks through theO-rings and gasket.9. Clean any dirt or foreign material from the actuatorstem.10. If an air filter is supplied, check and replacecartridge as necessary.DISASSEMBLY AND REASSEMBLYDisassembling the ActuatorRefer to Figures 1 through 4 to disassemble the cylinderactuator.1. Shut off air supply. If actuator is installed on a Flowservevalve, remove the valve per the appropiate installation, operation, maintenance instructions.WARNING: To avoid serious injury, depressurize the line to atmospheric pressure and drainall fluids before working on the actuator.2. Disconnect all tubing. Remove stem clamp andstem bellows from the actuator stem.3. Relieve spring compression completely by removing the adjusting screw. Remove adjusting screwO-ring from adjusting screw.CAUTION: Do not use a screwdriver or bar toturn the adjusting screw; instead, use awrench on the flats of the screw.WARNING: To avoid serious personal injury,relieve the spring compression before furtherdisassembly. The cylinder could possibly flyoff the yoke when removing the cylinderretaining ring.4. Remove the cylinder retaining ring from the grooveat the base of the cylinder by using two screwdrivers.Insert one screwdriver in slot found in the ring andpry the ring from the groove. Use the other screwdriver to help work the ring out of the cylinder groove.5. Pull the cylinder off the yoke and piston; someO-ring and quad-seal resistance may be felt.WARNING: To avoid serious personal injury,do not use air pressure to remove the cylinder.The cylinder could possibly fly off the yoke.6. For extended spring designs using a spring cap(see Figure 4), remove the spring cap and capO-ring from the cylinder.7. For air-to-retract configurations, remove thespring(s) and spring button for cleaning and inspection (see Figures 1, 3 and 5). Remove the actuatorstem locknut and slide the piston and stem spacer offthe actuator stem. The spring guide should be removed when using dual or extended spring designs.NOTE: The dual, spring configuration (Figure 3)has two springs, one inside the other. Remove bothsprings during this step.Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
Adjusting ScrewAdjusting Screw O-ring(Item No. 210)(Item No. 248)Cylinder(Item No. 202)Spring Button(Item No. 227)Thrust WasherSize 50 and Larger Only(Item No. 224)Actuator StemLocknutThrust WasherRetainer(Item No. 348)Size 50 Only(Item No. 223)Piston Stem O-ring(Item No. 272)Stem Spacer(Item No. 228)Piston(Item No. 225)Spring(Item No. 229)Upper Stem Bushing(Item No. 253)Piston Quad-seal(Item No. 271)Actuator StemQuad-sealYoke O-ring(Item No. 275)(Item No. 274)Cylinder RetainingRingLower Stem Bushing(Item No. 254)(Item No. 256)Stem BellowsActuator Stem(Item No. 247)(Item No. 211)Stroke PlateStem Clamp(Item No. 213)(Item No. 249)Jam NutStem Clamp Bolting(Item No. 217)(Item No. 240/345)Yoke(Item No. 201)Figure 1: Air-to-retract Cylinder ActuatorNOTE: Item numbers correspond directly to actuator's bill of material. Refer to it for specific part numbers.For air-to-extend configurations, slowly loosen andremove the actuator stem locknut. Be certain thepiston follows the stem locknut up the actuator stemand does not bind on the actuator stem. Removethe actuator stem locknut, spring button, piston,spring and stem spacer.WARNING: To avoid personal injury, be certainthe spring force is completely relieved beforeremoving actuator stem locknut.Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 86118. Remove the piston quad-seal, piston stem O-ringand yoke O-ring.9. Remove the actuator stem quad-seal.NOTE: The upper and lower stem bushings arepressed into the yoke. Removal of the bushings toreplace the actuator stem O-ring is unnecessary.10. Use appropriately sized press to push worn ordamaged bushings out of yoke.55-3
Adjusting Screw(Item No. 210)Adjusting Screw O-ring(Item No. 248)Actuator Stem Locknut(Item No. 348)Cylinder(Item No. 202)Piston(Item No. 225)Spring Button(Item No. 227)Stem Spacer(Item No. 228)Piston Quad-seal(Item No. 271)Actuator Stem Quad-seal(Item No. 275)Piston Stem O-ring(Item No. 272)Yoke O-ring(Item No. 274)Spring(Item No. 229)Cylinder Retaining Ring(Item No. 256)Upper Stem Bushing(Item No. 253)Actuator Stem(Item No. 211)Lower Stem Bushing(Item No. 254)Stem Clamp(Item No. 249)Stem Bellows(Item No. 247)Stem Clamp Bolting(Item No. 240/345)Stroke Plate(Item No. 213)Yoke(Item No. 201)Jam Nut(Item No. 217)Figure 2: Air-to-extend Cylinder ActuatorNOTE: Item numbers correspond directly to actuator's bill of material. Refer to it for specific part numbers.Reassembling the ActuatorTo reassemble the cylinder actuator, refer to Figures 1through 4:1. All O-rings and quad-seals should be replaced andlubricated with a silicone lubricant (Dow Corning 55M or equivalent). Fill the concave grooves on thequad-seals with grease prior to installing theseseals. Silicone O-rings must be lubricated withMagnalube-G lubricant or equivalent. Do not usesilicone lubricant on silicone O-rings.2. Thoroughly clean all internal parts before beginningassembly. Check the cylinder bore for scratches,pitting or worn areas. Lubricate cylinder wall and allinternal surfaces with appropriate lubricant.3. Lubricate the outside of the replacement bushings ifthe stem bushings have been removed. Press a new55-4lower stem bushing into the actuator stem bore inthe yoke until it bottoms out. Press the upper stembushing into the bore until it is flush with the top ofthe yoke (refer to Figures 1 or 2).4. Replace the actuator stem quad-seal and yokeO-ring.5. Reassemble the piston, piston stem O-ring and stemspacer on the actuator stem according to the properair-action (refer to either Figure 1 or 2). Replace thepiston quad-seal. Air-to-extend configurationsrequire the spring button to be stored under actuatorstem locknut. Tighten the locknut firmly.CAUTION: When installing the actuator stemlock nut, do not hold the actuator stem with apipe wrench as the sealing surface may beFlowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
Adjusting Screw O-ringAdjusting Screw(Item No. 248)(Item No. 210)Thrust WasherSize 50 and Larger Only(Item No. 224)Cylinder(Item No. 202)Thrust Washer RetainerSize 50 Only(Item No. 223)Spring ButtonOuter SpringSpring Guide(Item No. 227)(Item No. 229)(Item No. 326)Inner SpringPiston Stem O-ring(Item No. 230)(Item No. 272)Actuator Stem LocknutPiston Quad-seal(Item No. 348)(Item No. 271)PistonCylinder Retaining Ring(Item No. 225)(Item No. 256)Yoke O-ring(Item No. 274)Actuator Stem(Item No. 211)Upper Stem Bushing(Item No. 253)Stem Clamp(Item No. 249)Actuator Stem Quad-seal(Item No. 275)Stem Clamp BoltingLower Stem Bushing(Item No. 240/345)(Item No. 254)Jam NutStroke Plate(Item No. 217)(Item No. 213)YokeStem Bellows(Item No. 201)(Item No. 247)Figure 3: Dual-spring Cylinder ActuatorNOTE: Item numbers correspond directly to actuator's bill of material. Refer to it for specific part numbers.damaged; instead, use a wrench on the flats ofthe actuator stem.NOTE: When reassembling dual or extended,spring- design actuators, the spring guide must befirst inserted under the actuator stem locknut (seeFigures 3 and 4).6. Size 50 through 200 actuators use a thrust washerbetween the spring button and the adjusting screw.Replace the plastic thrust washer, and clean itsgland in the spring button (thrust washer retainer inthe size 50). Lubricate a new thrust washer with DowCorning 55M or equivalent grease on both sidesand insert it into the spring button or thrust washerretainer gland.7. VL-UHC actuators require that the piston be placedinto the cylinder prior to the actuator stem beingFlowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611inserted through the yoke. Place the cylinder on a flatsurface with the open end up. For air-to-retractconfigurations, place the thrust washer (and thethrust washer retainer on size 50) and the springbutton on the bottom of the cylinder centered on theadjusting screw hole. The size 25 actuator does notutilize a thrust washer. Place the spring(s) onto thespring button and place the piston assembly over thesprings in the actuator. With the piston at a slightangle, insert one side of it no more than one inch intothe cylinder bore. Slowly push the rest of the pistoninto the bore until the quad-seal stops the movement. While applying a small amount of pressure tothe piston, carefully push the extruded portion of thequad-seal into the piston gland with a dull, flatscrewdriver until the piston continues its downward55-5
Adjusting ScrewAdjusting Screw O-ring(Item No. 210)(Item No. 248)Spring CapThrust Washer(Item No. 325)Size 50 and Larger Only(Item No. 224)Spring(Item No. 229)Spring Button(Item No. 227)Cylinder(Item No. 202)Cap O-ring(Item No. 270)Spring Guide(Item No. 326)Actuator Stem LocknutUpper Stem Bushing(Item No. 348)(Item No. 253)Piston Stem O-ringActuator Stem Quad-seal(Item No. 272)(Item No. 275)Piston(Item No. 225)Lower Stem Bushing(Item No. 254)Piston Quad-sealCylinder Retaining Ring(Item No. 271)(Item No. 256)Yoke O-ringStem Clamp(Item No. 274)(Item No. 249)Stem BellowsStem Clamp Bolting(Item No. 247)(Item No. 240/345)Stroke PlateActuator Stem(Item No. 213)(Item No. 211)YokeJam Nut(Item No. 201)(Item No. 217)Figure 4: Extended-spring Cylinder ActuatorNOTE: Item numbers correspond directly to actuator's bill of material. Refer to it for specific part numbers.movement into the bore. For air-to-extend configurations, repeat this process without the thrustwashers or springs. Once the piston is installed andleveled, center the spring on the piston.WARNING: Do not pound the piston into thecylinder bore. This could damage or shear thequad-seal. Take extreme care to not damagethe quad-seal with the screwdriver.NOTE: To ensure maximum clamping strengthwhen installing the stem clamp, make sure theslots in the actuator stem will be in line with theinside webs of the yoke when the cylinder andyoke air ports are lined up.8. For extended spring design actuators, assembleper steps 6 and 7 while the cylinder sits on a tableor fixture with a hole sufficient to allow clearance of55-6the spring cap. Be sure to replace the O-ring in thespring cap prior to installation.9. Install the yoke onto the cylinder making sure theyoke is pushed deeply enough into the cylinder toallow the cylinder retaining ring to be installed. Careshould be taken not to scar or cut the yoke O-ring.10. Reinsert the cylinder retaining ring until it snaps inplace. Use a hammer and drift punch to lightly tapthe retaining ring in the groove.WARNING: To avoid personal injury, thecylinder retaining ring must be solidly in place.The cylinder could possibly fly off when pressurized. Be careful not to pinch or cut fingerson the square edges of the retaining ringduring installation.Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
11. Reinstall the adjusting screw using a new adjustingscrew O-ring.NOTE: Be certain the hole in the spring button orthrust washer is directly centered under the adjusting screw hole in the cylinder on air-to-retract configurations. Move as required with a screwdriver.12. Tighten the adjusting screw enough to provide anair seal with the O-ring. Do not overtighten.13. Reinstall the stem bellows and stem clamp.NOTE: To ensure maximum clamping strengthwhen installing the stem clamp, make sure the stemclamp bolting is perpendicular to one of the slotsmachined into the actuator stem.14. Apply air over the piston. Tighten the stem clampbolting with the stem clamp adjusted to point at theclosed position of the stroke plate.NOTE: If the actuator is installed on a Flowservevalve, refer to the appropriate installation, operation, maintenance instructions for correct plugstem thread engagement.Reversing the Air-actionTo change the air action from air-to-retract to air-toextend, or vice versa, refer to Figures 1, or 2 :NOTE: Dual or extended spring actuators are notreversible. Thrust washers are not used on air-toextend actuators.1. Disassemble the actuator according to the “Disassembling the Actuator” section.2. For air-to-retract action, reassemble the actuatorwith stem spacer and spring button over the piston.3. For air-to-extend action, reassemble with springand stem spacer below the piston and with thespring button stored above the piston.4. Reassemble the actuator according to the “Reassembling the Actuator” section.5. The positioner must also be reversed. See theappropriate positioner maintenance instructions.15. Reconnect tubing, supply and signal lines.TroubleshootingProblemHigh air consumption orleakageProbable Cause1. Leaks in the air supply or instrument signal system2. Malfunctioning positioner3. Leaks through O-rings or adjustingscrew O-ringCorrective Action1. Tighten connections and replace anyleaking lines2. Refer to appropriate positionermaintenance bulletin3. Replace O-ringsActuator does not move tofail position upon lossof air supply pressure1. Air pressure in cylinder not ventingbecause of faulty positioner2. Spring failure3. Internal valve problem1. Refer to appropriate positionermaintenance bulletin2. Replace spring3. Refer to valve’s maintenance bulletinJerky or stickingstem travel1. Insufficient air supply pressure1. Check air supply and any filters orregulators; check for leaking O-rings2. Lubricate cylinder wall with DowCorning 55M or equivalent lubricant3. Check actuator stem for damage;replace actuator stem, O-ring, andstem bushings, if necessary4. Disassemble actuator and checkcylinder and piston for damage;reassemble actuator correctly5. Refer to valve’s maintenanceinstructions2. Unlubricated cylinder wall3. Worn or damaged stem bushings4. Improperly assembled spring5. Internal valve problemFlowserve Corporation, Valtek Control Products, Tel. USA 801 489 861155-7
Flowserve Corporation has established industry leadership in the design and manufacture of its products. When properly selected, thisFlowserve product is designed to perform its intended function safely during its useful life. However, the purchaser or user of Flowserveproducts should be aware that Flowserve products might be used in numerous applications under a wide variety of industrial serviceconditions. Although Flowserve can (and often does) provide general guidelines, it cannot provide specific data and warnings for allpossible applications. 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 OperationMaintenance (IOM) instructions included with the product, and train its employees and contractors in the safe use of Flowserve products inconnection with the specific application.While the information and specifications presented in this literature are believed to be accurate, they are supplied for informative purposesonly and should not be considered certified or as a guarantee of satisfactory results by reliance thereon. Nothing contained herein is to beconstrued as a warranty or guarantee, express or implied, regarding any matter with respect to this product. Because Flowserve iscontinually improving and upgrading its product design, the specifications, dimensions and information contained herein are subject tochange without notice. Should any question arise concerning these provisions, the purchaser/user should contact Flowserve Corporationat any of its worldwide operations or offices.For more information, contact:Flowse
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 .
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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
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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 .
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
Valtek MaxFlo 3 Control Valves Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611 Types Double-acting cylinder with fail-safe spring action Sizes Cylinder sizes: 25, 50, 100, 200 Action Air-to-open, air-to-close; Fail-in-place Supply Pressure 150 psig* (maximum) 10.3 barg* (maximum) Auxiliary Declutchable side-mounted;
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