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byhovalves
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Iron
Maintenance for Valves
byhovalves   4/7/2012 1:37:28 AM
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preventivemaintenanceofthenewvalves.trunnionmountedballvalves,pipelineballvalves,fullweldedballvalves

1:itisveryimportanttochoosethesuitablevalveduringthedesigningstagefortheproject.invalvetechnologybook,theremustbeclearrequirementsofmaterials,accessoriesandteststandards.
2:besurethespecificationandtypeforthesealantjoints,internalsingledirectionvalveandvalvevent(sewageconnector).
3:adequateprotectionshouldbedonebeforeinstallationaswellasbeingafterinstallation.
4:maintenancebeforethevalvesareintooperation
   a:afteractivityofeachtimeduringtheconstructionprocess;
   b:aftertheendofthevalvewelding;
   c:afterhydrostatictest;
   d:aftercompletion;
   e:doonetime'smaintenanceperthreemonthsduringthefirstyear,andduringthesecondyeardoonetime'smaintenanceperhalfyear,andaftertwoyears,doonetime'smaintenanceayear.

maintenancebeforeapplication.
1.visualinspection
alltransportpackagingcomplieswiththerequirementsoftechnicalspecifications;
connector,anti-foulingmaterialandthemoistureofthewoodcover;
weldingendsandflangedendswithacorrosionprotectionlayer;
nosignificantdamageaftervisualinspectionandthebodysurfaceshouldmeetthetechnicalspecificationrequirements.
 
2.supervision
usethemarkedrings;
usetheliftingofthechain,theexternalcoatingforprotectivemeasures;
whenthevalvewithbracketsandtransmission,theslingisfixedinthevalverings,ratherthanthetransmission;
slingsandliftingchaincannotbemetoutintotheheightofthetubeorthetubeasasupport.
 
312289;maintenanceworkofvalveinstallationandwelding:(fullweldedballvalves)

(1)thevalveisinstalledpriortoweldingoperations
makesurethepositionofthevalvewhichshows"open";
toinjectsealweldlubricantsandgreasetoprotectthebodyandsealpipingaccordingtothedifferentbrandsandspecificationsofthevalves;
wipetheprotectionofthevalveballinternalsmeargrease,lubricantsandgreaseappliedintheringandball;
reinforcedvalveport;
rusttreatmentonallthreads;
recognizingthestem,thegreaseportconnectordoesnothaveanypaint;
buriedballvalveisinstalled,confirmthatthemanipulationshaftcoattheballwiththedrivemechanismontheground;
checktheburiedballvalvesuptoanextensionofthegland,holdthecontrolsurfaceofthegroundandmakethelogo.
(2)theprotectionofthevalveweldingjob
confirmvalvepreheatingandweldinginthe"open"position;
valvemustbesupportedinthebaseandcanslidefreelyintheaxialdirection;
welding,ballvalveinternalsealtemperaturedoesnotexceed140°c,theexternalfatinjectionporttemperaturedoesnotexceed80°c;
promptlyaftertheendofweldingaddasmoothfat;
verifythatthevarietyofconnectorsarenotloose;
confirmtheoutfall,thepressurewhichtheportisinthelockedstate;
turnthevalve1/2"open"or"off",toconfirmthesmoothoperation;
aftersolderingiscompletedthepressuretesttoconfirmthevalveingoodcondition.
 
(b)valvepressuretestmonitoringandprotectionofthesealingsystem
 astresstestwhentheoperatingrange
9332;waterpressuretest
whencleaningthepipebeforethepressuretesttodeterminethevalveinfull"on"state;
inthepipelineisfilledwithwater,makesuretheballvalvehalf-openat10°-45°;
pressureinthepipeline,checkalljointsforleaks;
manometryaftertheimplementationofsewageoperationstoclearthebodyofthepressureandimpurities;
valvereplies"on"state;
addlubricantslipid;
correctsupervisionofsitepersonneltooperatethevalve;
supervisionofthepressuretesttomeetthetechnicalrequirements.
 
9333;testpressurestage
pressuretestthecorrectpositionofthefirstcheckvalve;
valveisfullyopenandforthefoamtest;
valveisfullyclosed,andforthefoamtest;
valvetorestorethenormalrunningposition;
addlubricantslipid;
dostemtest.
monitoringvalvewhilepipelineiswithpressure.fixitimmediatelyifleaks;
a:togreaseoperationsforallballvalves.
b:toshutdowntheoperatingforalltheballvalves.
c:checksealingofthevalves.
d:keepallballvalvesbeingfullyopenoperating.
e:closethesewagemouthaftersewagingagain.
f:complementagainthesmoothfattorun.



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