Valtek Extended Bonnets.pdf - PRO-QUIP

More documents

Recommendations

Info

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
Page 6 and 7: Gland Flange(Item No. 80)Upper Stem
Page 8: Troubleshooting Extended BonnetsFai

Valtek Extended Bonnets.pdf - PRO-QUIP

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?