AIR REDUCING VALVE船用减压阀

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1、INSNo.D-12E(Rev.O)NS5O3SeriesNAKAKITASEISAKUSHOCO-LTD.PilotOperatedTypeReducingValve1-1FukonominamLmachi,Daito-shi,Osaka,JAPANN]TEL(072)87'I-1341HAKAKITAlnstructionManual@72)A71-7471IFAx

2、.o7A874-75011.ConfigurationandFunctionThisreducingvalveiscomposedofamai

3、nvalveandapistonforFig.1NS503GFig.2NS5O3Sthrottling,andadiaphragm,apilotvalveandanadiustingspringforsecondarypressuredetection.Thesecondarypressureworkingonthediaphragmthroughthepressuredetectingportisbalancedwiththeforceoltheadiustingspring,andthechangeinthe

4、balanceoftheforcesisusedtocontrolthedegreeofopeningofthepilotvalve.Thepilotvalveusestheprimarypressureasthecontrolpowersource'andadjuststhepressureontheupperportionofthepistontocontrolthedegreeofopeningoflhemainvalve.Thischainofoperations-isrepeatedinaverysho

5、rttimetoachiveautomaticcontrolofthe-secondarypressurewithinaspecifiedrange.Settingofthesecondarypressureisetfectedthroughtheadjustscrew.Turningitclockwiseraisesthesetpressure.Counterclockwiseturninglowersthesetpressure.2.lnstallationa.Installthereducing.ralv

6、everticallyonahorizontalrunolpiping.Provideasufficientoverhaulspacearoundthevalve.Wesuggestuseofadrainvalveandastrainer.b.ThepipingarrangementisasshowninFig.3.AlwaysobservethespecifieddimensionsAandBofthestraightrunsoftheinletandoutletofthereducingvalve.Fig.3

7、-l-i;;--f-nsecondarypressure:P1:primarypressuresetoressureT:11T:rLlfU=StopvalveStopvalve(d:nominalsizeofthereducingvalve)-rI/3.OperationandAdjustmenta.Theprocedureofoperationandadlustmentisasfollows:(1)Slightlyopenthestopvalveontheoutletsideofthereducingvalve

8、'(2Graduallyopenthestopvalveontheinletsideotthereducingvalvetothefull.(3)Openthedrainvalveofthestrainertoblowdownthedrain'(4)MakesuretheprimarypressureiSatthespecifiedvalue,thenadiustthepressurewiththeadjustscrew.(5)Graduallyopenthestopvalveontheoutletsideto

9、thefuh'(6)Asthesecondarypressureorsetpressurewilldropsilghtly,readiustit.pressureoftheapparatusincludingtheb.Asthereducingvalvehasaslightleakage,payduecarewhenraisingthereducingvalve.4.Di