Valtek Extended Bonnets.pdf - PRO-QUIP

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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
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