Kitz B Series - Periodic Inspections and Maintenance

DocumentNo.:KE-4025-06                                           19/50
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12PeriodicInspectionsandMaintenanceofValvesandActuators
Periodicinspection(atleasttwiceaweek,dependingontheserviceconditions)mustbecarriedoutforsafe
andtrouble-freeoperation.
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12.1ValveOperation
(1)Open-CloseOperation
CheckthatthevalvecanbefullyopenedandclosedaccordingtotheON-OFFcontroloftheactuator.
Ensure that the valve opening or closing degree is adequately maintained in response to the signal
pressureorsignalcurrencyoftheactuatorandtheaccessories.
(2)NoiselessandVibration-FreeOperation
Ifanabnormalnoiseisdetected,airpassagethroughtheactuatorandthetubingorfluidthroughthevalve
bore might have been disturbed by dusts or other foreign objects. Find the source of the noise and
vibration,andtakeappropriatepreventivemeasures.
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12.2SealingFunctions
(1) ExternalLeakage
Applysoapsolutionoverthesealingareasofvalve,actuatorandairtubingjoints.Externalleakagemay
resultinthereplacementofOrings,gasketsand/orpackingrings.
(2) InternalLeakage
Checktheairexhaustportofthesolenoidvalveortheairsupplyportoftheactuatortoensurethatthe
airpressureissatisfactorilysealedwithintheactuator.Internalleakagemayresultinthereplacementof
Oringsoftheactuator.
(3) FirmlyTightenedBolting
Boltsandnutsusedtoassemblethevalve, actuator and accessories must beperiodicallyretightened,
becausetheymaybecomelooseduringoperation.
(4) Many pieces of O rings are used for the critical sealingareas of the B Seriesactuators.O rings are
subject to frictions with moving parts such as pistons, which reduce the life of O rings and the
consumables.WerecommendaperiodicreplacementofOrings.RefertoChapter17Consumablesin
thisoperationmanualfororderingspecifications.
(5) Sealwasherisusedforthestopperboltsofthecylinder.Leakagemayoccurfromthesealwasheraftera
longtermuse.Retightenthenutasrequiredorreplacethesealwasher.
(6) Leakagetestfromthebreathingportshouldbedonein15to30minutsafterpressurizingtheactuator.
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12.3PartialStrokeTest
Apartialstroketest(PST)shallbecarriedoutontheautomatedvalvesequippedwithapartialstroketest
deviceperiodicallytokeeptherequiredsafetylevel.Seetheoperationmanualofthepartialstroketestdevice
fordetailsoftheprocedures.
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