Valtek Extended Bonnets.pdf - PRO-QUIP

Extended Twin "V"Extended Twin SquareExtended Twin "V"With PurgeExtended Twin SquareWith PurgeExtended "V"Extended SquareFigure 3: Packing ConfigurationsVacuum Seal Twin "V"With Purge14-4 Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611IM014 Extended Bonnets.p6548/21/01, 2:14 PM

ExtensionBonnet(Item No. 41)Bolting(Item no. 110)BonnetExtensionGasket(Item No. 60)Bonnet(Item No. 40)Extension Bonnet(Item No. 41)Bolting(Item no. 110)BonnetExtensionGasket(Item No. 60)Half Ring(Item No. 13)Flange(Item No. 73)Bonnet(Item No. 40)Figure 4: Bolted ExtensionFigure 5: Bolted Flange ExtensionNote: Item numbers correspond directly to the valve's bill of material. Refer to the bill of material for specific part numbers.CAUTION: Do not overtighten packing. This cancause excessive packing wear and stem frictionwhich may impede stem movement.7. After installing a new seat gasket, the seat ring, seatretainer and a new bonnet gasket, lower the actuator/bonnetassembly squarely into body. Be carefulto not scratch or gall plug as it enters the body.8. Install bonnet flange bolting to finger-tightness.Apply air pressure above the piston to seat the plugin the seat ring. Tighten each bonnet bolt about 1 /6(one flat) of a turn at a time in a clockwise directionaround the bonnet flange. Firmly tighten all boltsevenly and completely to compress the bonnetgasket until the bonnet is seated metal-to-metal inthe body. Proper tightness is achieved when metalto-metalresistance can be felt with the wrench.CAUTION: If the bolting is insufficiently tightened,the seat ring gasket will not have enoughcompression, resulting in leakage. Overtighteningbeyond the point of metal-to-metal resistancemay damage interior valve parts.9. The amount the plug stem is screwed into theactuator stem is not particularly important on air-toclosevalves as long as the plug fully contacts theseat when the valve is closed. It is necessary only toleave two to three threads exposed. For correct plugengagement on air-to-open valves, screw the plugstem into the actuator stem as far as possible. Applyair pressure above the piston to drive it to the bottomof the actuator cylinder. Back the plug stem out ofthe actuator stem until the plug just touches the seatring. Apply air under the piston to lift the plug off theseat and back the plug stem out of the actuator stemexactly one complete turn.Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 861110. Apply air over the piston to seat the plug. With thestem clamp adjusted to the “closed” position of thestroke indicator plate, tighten stem clamp bolting.Disassembling Bonnet ExtensionsTo disassemble valves equipped with bonnet extensions,refer to Figures 4, 5, 6 and 7 then proceed as follows:WARNING: Depressurize line to atmospheric pressure,drain all fluids and decontaminate the valve (ifcaustic or hazardous materials are present). Failureto do so can cause serious injury.1. Remove bonnet flange bolts or nuts.2. Remove the entire actuator/bonnet extension assembly– including the bonnet and plug – by lifting itstraight out of the body.CAUTION: Heavy assemblies may require ahoist. Attach lifting straps to actuator yoke legs.3. Loosen the actuator stem clamp.4. Remove packing box bolting.5. Remove the yoke bolting, clamps and half rings (ifpresent).6. Remove the actuator by unscrewing the plug andbonnet in unison from the actuator stem. Unscrewingthe plug and bonnet together prevents damageto the plug stem and packing box wall.WARNING: Do not allow the plug or bonnet to fallduring removal from the actuator. Serious personalinjury or valve damage may result.7. Pull the plug carefully through the packing box andbonnet.WARNING: Process fluid may be trapped in thebonnet extension; therefore, be extremely cautiouswhen removing the plug from the bonnetand bonnet extension.14-5IM014 Extended Bonnets.p6558/21/01, 2:14 PM

Gland Flange(Item No. 80)Upper Stem Guide(Item No. 87)Packing(Item No. 88)Bonnet Flange(Item No. 70)Bonnet Gasket(Item No. 58)LowerStem Guide(Item No. 83)Seat Retainer(Item No. 30)Seat Ring(Item No. 20)Bonnet Extension Clamp(Item No. 72)Bonnet ExtensionGasket(Item No. 60)Bonnet Flange Bolting(Item No. 108/114)Yoke Clamp(Item No. 76)Yoke Clamp Bolting(Item No. 107/118)Yoke Half Rings(Item No. 12)Bonnet Extension(Item No. 41)Packing Spacer(Item No. 95)Clamp Bolting(Item No. 110/120)Joint Packing Spacer(Item No. 94)Bonnet(Item No. 40)PackingSpacer(Item No. 93)Plug(Item No. 50)Body(Item No. 1)Seat RingGasket(Item No. 55)Figure 6: Clamped Bonnet ExtensionNote: Item numbers correspond directly to the valve's bill of material. Refer to the bill of material for specific part numbers.8. Remove the bonnet connecting bolts, extensionclamps or flanges and half-rings (see Figures 4, 5,6 and 7) and associated bolting. The bonnet flangemay now be removed, if desired.9. Pull apart the bonnet and bonnet extension andremove stem guides, packing, and packing spacersfrom both halves of the packing box.10. Remove the bonnet extension gasket from gasketgroove on the bottom face of the bonnet extension.Reassembling Bonnet ExtensionsTo reassemble valves equipped with bonnet extensions,refer to Figures 3, 4, 5, 6 and 7 then proceed asfollows:1. Clean the gasket seating surfaces on the bonnetand bonnet extension.2. Insert lower stem guide and packing spacer into thebonnet.3. In clamp-on extensions, place a joint packingspacer in the bonnet. This spacer should be centeredat the joint between the bonnet and bonnetextension.NOTE: Late model extensions do not have jointpacking spacers. Packing spacers only need to beinstalled up to the packing.4. Making sure the new bonnet extension gasket isproperly seated in the gasket groove on the bottomface of the bonnet extension, slip the bonnet exten-14-6 Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611IM014 Extended Bonnets.p6568/21/01, 2:14 PM

Bonnet Extension(Item No. 41)Upper Flange(Item No. 72)Flange Half Rings(Item No. 13)Bolting(Item No. 110)Bonnet ExtensionGasket(Item No. 60)Lower Flange(Item No. 73)Bonnet(Item No. 40)Figure 7: Bolted Double-flange and Clamp DesignNote: Item numbers correspond directly to the valve's bill of material. Refer to the bill of material for specific part numbers.sion over the joint packing spacer and mate thebottom face of the bonnet extension with the topface of the bonnet.5. After making sure the bonnet flange is in place,reinstall the connecting bolts, extension clamps orflanges and associated bolting. When usingflanges, make sure the flange half-rings are positionedas shown in Figure 5 or 7, depending on theextension configuration. At this point, the boltingshould only be just more than finger-tight.6. Reinstall remaining packing spacer(s), new packing,and upper stem guide. Install lubricator, ifrequired.7. Insert plug stem through bonnet and bonnet extension,being careful not to score the stem or guides.8. After reinstalling the two yoke half-rings on thebonnet extension and making sure the gland flangeis in place, turn the actuator back onto the plug.Leave approximately two or three plug stem threadsexposed.9. Attach the yoke clamps and gland flange bolting.Tighten packing box nuts to slightly over finger-tight.CAUTION: Do not over-tighten packing. Thiscan cause excessive packing wear and stemfriction which may impede stem movement.10. After installing new seat and bonnet gaskets, lowerthe actuator/bonnet assembly squarely into thebody. Be careful not to scratch or gall the plug as itenters the body.11. Install bonnet flange bolting to finger-tightness.Apply air pressure above the piston to seat the plugFlowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611in the seat ring. Tighten each bonnet bolt about 1 /6(one flat) of a turn at a time in a clockwise directionaround the bonnet flange. Firmly tighten all boltsevenly and completely. Compress the bonnet gasketuntil the bonnet is seated metal-to-metal in thebody. Proper tightness is achieved when metal-tometalresistance can be felt with the wrench.CAUTION: If the bolting is insufficiently tightened,the seat ring gasket will not have enoughcompression, resulting in leakage. Overtighteningbeyond the point of metal-to-metal resistancemay damage interior valve parts.12. The amount the plug stem is screwed into theactuator stem is not particularly important on air-toclosevalves. It is necessary only to leave two tothree threads exposed. For correct plug engagementon air-to-open valves, screw the plug stem intothe actuator stem as far as possible. Apply airpressure above the piston to drive it to the bottom ofthe actuator cylinder. Back the plug stem out of theactuator stem until the plug just touches the seatring. Apply air under the piston to lift the plug off theseat and back the plug stem out of the actuator stemexactly one complete turn.13. Apply air over the piston to seat the plug. With thestem clamp adjusted to the “closed” position of thestroke indicator plate, tighten stem clamp bolting.14. After the bonnet flange bolting has been tightenedand the plug adjusted, tighten the extension clampor flange bolting so that even pressure on the gasketand proper alignment of the bonnet and bonnetextension are maintained.14-7IM014 Extended Bonnets.p6578/21/01, 2:15 PM

Troubleshooting Extended BonnetsFailure Probable Cause Corrective ActionLeakage through 1. Insufficient compression of 1. Tighten flanges or clamps until leakage stopsclamps or flanges bonnet extension gasket2. Worn or damaged bonnet extension gasket 2. Disassemble and replace gasket3. Faulty clamp 3. Replace with bolted or bolted flange extension orextended bonnet4. Side loading of the bonnet extension 4. Install valve with extension as vertical as possibleLeakage through 1. Loose packing box bolts 1. Tighten packing box bolts sufficiently to stop leakagepacking box 2. Worn or damaged packing 2. Disassemble and replace packing3. Dirty or corroded packing box 3. Clean body bore and plug stem, replace packingStem motion 1. Overtightened packing 1. Adjust packing box nuts to slightly more than finger-tightimpeded 2. Service temperature is beyond operating 2. Reconfirm service conditions and contact factoryparameters of trim design3. Inadequate air supply 3. Check for leaks in air supply or instrument signal system;tighten loose connections and replace leaky lines4. Malfunctioning positioner 4. Refer to positioner maintenance instructionsExcessive leakage 1. Improperly tightened bonnet flange 1. Refer to Maintenance Instructions 1 for correct tighteningboltingprocedure2. Worn or damaged seat ring 2. Disassemble valve and replace or repair seat ring3. Worn or damaged seat or bonnet gasket 3. Disassemble and replace gaskets4. Inadequate actuator thrust 4. Check for adequate air supply to actuator; if supply isadequate, reconfirm service conditions, contact factory5. Incorrectly adjusted plug 5. Refer to appropriate step for plug adjustment containedearlier in this maintenance instructions6. Improper flow direction 6. Make sure flow direction is always over plug; if incorrect,change to flow-overInadequate Flow 1. Improper plug adjustment limiting stroke 1. Refer to appropriate step for plug adjustment containedearlier in this maintenance instructions2. Malfunctioning positioner 2. Refer to positioner maintenance instructions3. Service conditions exceeding trim design 3. Verify service conditions and consult factorycapacityPlug slams 1. Incorrect plug adjustment allowing 1. Refer to appropriate step for plug adjustment containedimproper cushion of air between actuator earlier in this maintenance bulletinpiston and yoke2. Trim sized too large for flow rate 2. Install reduced trim3. Inadequate air supply 3. Check air supply to actuator; repair leaks and remove anyrestrictions in supply lineFlowserve Corporation has established industry leadership in the design and manufacture of its products. When properly selected, this Flowserve product is designed to perform its intendedfunction safely during its useful life. However, the purchaser or user of Flowserve products should be aware that Flowserve products might be used in numerous applications under a widevariety of industrial service conditions. Although Flowserve can (and often does) provide general guidelines, it cannot provide specific data and warnings for all possible applications. Thepurchaser/user must therefore assume the ultimate responsibility for the proper sizing and selection, installation, operation and maintenance of Flowserve products. The purchaser/usershould read and understand the Installation Operation Maintenance (IOM) instructions included with the product, and train its employees and contractors in the safe use of Flowserve productsin 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 change withoutnotice. 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:Regional Headquarters1350 N. Mt. Springs Prkwy.Springville, UT 84663Phone 801 489 8611Facsimile 801 489 371912 Tuas Avenue 20Republic of Singapore 638824Phone (65) 862 3332Facsimile (65) 862 494012, av. du Québec, B.P. 64591965, Courtaboeuf Cedex, FrancePhone (33 1) 60 92 32 51Facsimile (33 1) 60 92 32 99Quick Response Centers5114 Railroad StreetDeer Park, TX 77536 USAPhone 281 479 9500Facsimile 281 479 8511104 Chelsea ParkwayBoothwyn, PA 19061 USAPhone 610 497 8600Facsimile 610 497 66801300 Parkway View DrivePittsburgh, PA 15205USAPhone 412 787 8803Facsimile 412 787 1944Flowserve and Valtek are registered trademarks of Flowserve Corporation. For more information about Flowserve, contact www.flowserve.com or call USA 972 443 6500FCD VLAIM014-08 © 2001 Flowserve Corporation. Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611IM014 Extended Bonnets.p6588/21/01, 2:15 PM