Valtek ChannelStream Control Valves.pdf - PRO-QUIP

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Bonnet(Item No. 40)BonnetFlangeBolting(Item No. 108/114)BonnetGasket(Item No. 58)Plug(Item No. 50)BonnetFlange(Item No. 70)Channel-StreamCartridge(Item No. 30)Seat Ring(Item No. 20)Seat RingGasket(Item No. 20)Bonnet(Item No. 40)SleeveGasket(Item No. 56)Sleeve(Item No. 31)Plug Seals(Item No. 65)Plug(Item No. 50)Plug VentBody(Item No. 1)Bonnet FlangeBolting(Item No. 108/114)BonnetFlange(Item No. 70)BonnetGasket(Item No. 58)ChannelStreamCartridge(Item No. 30)Seat Ring(Item No. 20)FLOWFLOWBody(Item No. 1)Figure 1: Unbalanced TrimSeat RingGasket(Item No. 55)Figure 2: Pressure-balanced TrimNOTE: Item numbers refer to the valve's bill of material. Refer to it for specific part numbers.NOTE: If cartridge must be disassembled to cleanindividual channels and expansion holes, carefullygrind away the small bead welds located near thetop of the cartridge. This will loosen pins located incounter-drilled holes. The pins can now beremoved and the stages separated.WARNING: To avoid personal injury, use eyeand face protection when grinding or usingsolvents.Reassembly of Unbalanced ChannelStreamRefer to Figure 1 and proceed as follows:1. If the cartridge has been disassembled for cleaning,realign vent holes at the top of retainer and replacepins. Pins should be placed 180 degrees from eachother and tack welded using a 1 /8-inch bead weld toretain the pin.Caution: Do not weld any more than the approved1 /2 inch. Excessive heat from bead weldsthat are too large can disturb critical plug /cartridge tolerances. Use an appropriate weldrod which is compatible with the cartridgematerial (if uncertain, contact factory).2. Install a new seat ring gasket and reinstall seat ring.NOTE: Bonnet and seat ring gaskets should bereplaced every time the valve is disassembled.3. Install the cleaned cartridge, making sure the endwith pins is at the top (toward the bonnet). Visuallyposition the cartridge concentric with seat ring bore.4. Install a new bonnet gasket.5. Fully retract plug (stem clamp indicator pointing tothe open position) and lower actuator, bonnet andplug squarely into body and cartridge.WARNING: Failure to return plug to mid-strokeposition on mechanical / hydraulic actuatorswill cause damage to actuator and / or valveduring bonnet tightening sequence. This is dueto the inability of most mechanical / hydraulicactuators to accommodate the 1 /16-inch backdrivingduring tightening sequence.CAUTION: The bonnet aligns closely to thebody and the plug aligns closely with the cartridge;therefore, caution should be used tomake sure they are installed squarely.6. Once bonnet is resting on the body, tighten bonnetflange bolting to finger-tightness.7. Seat the plug two or three times to center the seatring. This is done by applying air to the actuator.NOTE: Step 8 applies only to valves with pneumaticactuators. If a hydraulic or mechanical operator isused, leave the plug in mid-stroke and proceed tostep 9.25-2 Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
8. With plug in the extended (or closed) position, begintightening bonnet flange bolting (keep the bonnetsquare with the valve). Tighten the first bolt 1 /6 turn,then tighten the bolt directly opposite 1 /6 turn.9. Continue tightening all bolts until the bonnet isfirmly seated, metal-to-metal, in the body. This caneasily be felt through the wrench.10. Slowly stroke the plug up and down to check thealignment of the plug with the cartridge.CAUTION: If erratic jerking of stroke indicatoror scraping is detected, stop stroking the valveimmediately. This may indicate misalignment.Remove the bonnet and actuator and realignthe cartridge by repeating steps 3 through 10 ofthis section. If either or both the plug orcartridge bore are damaged, consult factory.Disassembly of Pressure-balancedChannelStreamRefer to Figure 2 and proceed as follows:WARNING: Depressurize line to atmospheric pressureand drain all fluids before working on thevalve. Failure to do so can cause serious injury.1. Fully retract plug until stem clamp indicator is pointingto open position.2. Remove bonnet flange bolting and lift actuator,bonnet and plug out of valve body. A hoist may benecessary for larger valves.WARNING: Danger exists in removing actuator,bonnet and plug – especially if PTFE pressurebalancedseals are used. The pressurebalancedsleeve may stick to the plug and fallduring disassembly, causing possible seriousinjury and / or damage to the valve or nearbyequipment. Steps 3 through 6 should be consultedbefore attempting to remove the plug fromthe sleeve.3. If the sleeve is observed sticking to the plug duringremoval, do not attempt to lift plug and sleeve out ofthe body.4. Fully extend the plug, allowing the bonnet to riseabove the body.5. Place equally thick, wooden blocks in at least threeplaces between the sleeve and bonnet. Retractplug until seals are freed from sleeve.6. Lift actuator, bonnet and plug assembly from body,taking care not to damage sleeve bore of plug head.7. Remove the sleeve, cartridge, seat ring and gasketsfrom body. In larger sizes, the cartridge orsleeve may be too heavy to lift without a hoist.Therefore, tapped holes are machined into the topof cartridge and sleeve for installation of lifting rings.8. The cartridge may now be cleaned according toestablished industry methods. If a degreasingsolvent is used, make sure it will not dissolve metaland increase the tolerances between stages. Contactthe factory if uncertain about which methods touse with a particular ChannelStream cartridge andapplication.NOTE: If the cartridge must be disassembled toclean the individual channels and expansion holes,carefully grind away small bead welds located nearthe top of the cartridge. This will loosen pins locatedin counter-drilled holes. The pins can now be removedand the stages separated.Reassembly of Pressure-balancedChannelStreamRefer to Figure 2 and proceed as follows:1. If the cartridge has been disassembled for cleaning,realign vent holes at top of retainer and replacepins. Pins should be placed 180 degrees from eachother. The pins must then be tack welded using a1/8-inch bead weld to retain the pin.CAUTION: Do not weld any more than the approved1 /8 inch. Excessive heat from bead weldsthat are too large can disturb critical plug /cartridge tolerances. Use an appropriate weldrod which is compatible with the cartridge material(if uncertain, contact factory).2. Install new seat gasket and reinstall seat ring.NOTE: All gaskets should be replaced wheneverthe valve is disassembled.3. Install new bonnet and sleeve gaskets. Installcartridge and sleeve. Use lifting rings and hoistwhen installing cartridges and sleeves machinedwith tapped holes.4. Lower actuator, bonnet and plug assemblysquarely into sleeve bore. If PTFE seals are used,the plug may remain retracted. Care should betaken with PTFE seals to avoid scoring or gallingsealing surfaces while fitting the plug into the sleevebore. With metal piston ring seals, the plug must beextended a few inches to allow the use of a ringcompressor on metal rings. A suitable sized screwtypehose clamp will also serve to compress therings for reassembly.WARNING: Failure to return plug to mid-strokeposition on mechanical / hydraulic actuatorswill cause damage to actuator and / or valveduring the bonnet tightening sequence. This isdue to the inability of most mechanical / hydraulicactuators to accommodate the 1 /16-inchback-driving during tightening sequence.5. Once the bonnet is resting on the body, reinstall andtighten bonnet flange bolting to finger-tightness.6. Seat the plug two or three times to center the seatring. This can be done using the actuator.Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 861125-3
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