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1、ActuatorDeviceusedtooperateavalveusingelectric,pneumaticorhydraulicmeans.Oftenusedforremotecontrolorsequencingofvalveoperations.AlloysteelAsteelconsistingprimarilyofironwithsomepercentageofoneormoreotherelementssuchaschromium,nickel,manganese,orvanadiumdelibe
2、ratelyaddedtoenhanceitsproperties.AmbienttemperatureTheprevailingtemperatureoftheenvironmentimmediatelysurroundinganobject-generallyconsideredtobe-20°Fto+100°F.AusteniticstainlesssteelThecommonstainlesssteel,wheretheprimarymicrostructureisausteniteandthecompo
3、sitionprimarilyironbutalsoincludesbothchromiumandnickel.Thesteelsaredesignatedas300seriessuchas304,316,CF8M,etc.BevelgearoperatorDevicefacilitatingoperationofagateorglobevalvebymeansofasetofbevelgearshavingtheaxisofthepiniongearatrightanglestothatofthelargerr
4、inggear.Thereductionratioofthisgearsetdeterminesthemultiplicationoftorqueachieved.BackseatAshoulderonthestemofagateorglobevalvewhichsealsagainstamatingsurfaceinsidethebonnettopreventleakageofmediathroughthebonnetstuffingboxwhenthevalveisfullyopened.BallTheclo
5、sureelementofaballvalve.BallvalveAvalveusingasphericalclosureelementwhichisrotatedthrough90°toopenandclosethevalve.BodyTheprinciplepressurecontainingpartofavalveinwhichtheclosureelementandseatsarelocated.BoltedbonnetAbonnetwhichisconnectedtoavalvebodywithbolt
6、sorstudsandnuts.BoltedconstructionDescribesavalveconstructioninwhichthepressureshellelements(suchasbodyandclosuresofatrunnionballvalve)areboltedtogetherandsocanbetakenapartandrepairedinthefield.BonnetThetoppartofavalve,attachedtothebody,whichcontainsthepackin
7、ggland,guidesthestem,andadaptstoextensionsoroperators.Bore(orport)Theinsidediameterofthesmallestopeningthroughavalve,e.g.,insidediameterofaseatring,diameterofholethroughballinaballvalve.ButtweldendTheendconnectionofavalvesuitablypreparedforbuttweldingtoaconne
8、ctingpipe.CarbonsteelIroncontainingcarbonintheformofcarbides,about0.1to0.3percentcarbonwithnootheralloyingelementsotherthanthesulfur,phosphorus,andotherelementspresentinalmostallsteels.Ca
