Pentair Keystone Figure 952 NPS 2 Istruzioni per l'installazione

KEYSTONE FIGURE 952 KNIFE GATE VALVES

NPS 2 - 24 DiSaSSembly iNStructioNS

Removal, disassembly and inspection instructions.

RISING SPINDLE VALVES

•Ensureallpartsarecleanandfreeofforeign

material, particularly the chest area between

the gland and valve bore.

•Foroptimumleak-freeservice,gatefaces

andedgesmustbesmooth,andfreeof

gallingorburring.Repairorreplaceif

excessively worn or damaged.

•Seatingfacesinvalveboremustbesmooth

andundamagedotherwiseleakageislikely

tooccur.Replaceifnecessary.

•Checkglandsealingfacesontopof

valve body. They should be smooth and

undamaged.Repairifnecessary.

•Checkthreadsonspindlesandbolts-

repair/replaceifnecessary.

•Replacelocknutsifthreadsarestripped

orweakened.Theseareusedasprotection

against vibration.

•Checkandreplacegateguides(13)ifnecessary.

NOTE:

NPS2-8F952valveillustrated

NOTE:

NPS10-24F952valveillustrated

www.pentair.com/valves PPLBE-0004-US 14/07

REMOVAL AND DISASSEMBLY

1. Ensure pipeline is not pressurized and that

any hazardous medium is drained away.

2.Largevalvesneedachainblockorcraneto

assist.Iflarge,heavycylindersarefitted,they

canberemovedfirstiffeltnecessary:

 •Disconnectactuatorairlinesandpower

supplies etc.

 •Supportactuator,disconnectactuatorrod

fromvalvegate,undobridgeboltsorhold

downbolts,removeactuatorfromvalve.

3.Supportvalvebodyandremoveallflange

bolts.

4.Removevalveandgasketsfromthepipeline.

For NPS 2-8 valves

 •Loosenglandboxnuts(10)toendofpillar

(9)threads.Removeclevisfastener(15).

Removebothbridgenuts(13).

 •Removehandwheel(oractuatorassembly.

Unscrewbothpillars(9)andremove.

For NPS 10-24 valves

 •Removeglandboxnuts(10)andwashers

(11,12).Removeclevisfasteners(19,20).

 •Removeuprightbolts(14)andwashers(15)

atvalvebody(1).Removepillarnut(23)and

washer(22).

5.Withdrawglandbox(3)andgate(2)assembly.

6.Removegateguides(13)fromvalvebody(1).

KEYSTONE FIGURE 952 KNIFE GATE VALVES

NPS 2 - 24 DiSaSSembly iNStructioNS

NON - RISING SPINDLE VALVES

•Ensureallpartsarecleanandfreeofforeignmaterial,particularlythechestareabetweenthe

gland and valve bore.

•Foroptimumleak-freeservice,gatefacesandedgesmustbesmooth,andfreeofgallingor

burring.Repairorreplaceifexcessivelywornordamaged.

•Seatingfacesinvalveboremustbesmoothandundamagedotherwiseleakageislikelytooccur.

Replaceifnecessary.

•Checkglandsealingfacesontopofvalvebody.Theyshouldbesmoothandundamaged.Repair

ifnecessary.

•Checkthreadsonspindlesandbolts-repair/replaceifnecessary.

•ReplaceNylocnutsifthreadsarestrippedorweakened.Theseareusedasprotectionagainst

vibration.

•Checkandreplacegateguides(11)ifnecessary.

REMOVAL AND DISASSEMBLY

1. Ensure pipeline is not pressurized and that any hazardous medium is drained away.

2. Largevalvesneedachainblockorcranetoassist.Iflarge,heavycylindersarefitted,theycan

beremovedfirstiffeltnecessary:

•Disconnectactuatorairlinesandpowersuppliesetc.

 •Supportactuator,disconnectrodfromvalvegate,undobridgeboltsorholddownbolts,

removeactuatorfromvalve.

3. Supportvalvebodyandremoveallflangebolts.

4. Removevalveandgasketsfromthepipeline.

 •Removeglandboxnuts(8)andwashers(21,10).Removeclevisfasteners(13)andwashers

(22).

 •Removeuprightmountingbolts(12)andwashers(14)atvalvebody(1).Removepillarnut(19)

andwasher(9).

5. Withdrawglandbox(3)andgate(2)assembly.

6. Removegateguides(11)fromvalvebody(1).

NOTE:

NPS10-24F952non-risingspindlevalveillustrated.

PENTAIR VALVES & CONTROLS

www.pentair.com/valves

AllPentairtrademarksandlogosareownedbyPentairLtd.Allotherbrandorproductnamesaretrademarksorregisteredmarksoftheirrespectiveowners.

Becausewearecontinuouslyimprovingourproductsandservices,Pentairreservestherighttochangeproductdesignsandspecificationswithoutnotice.

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