Watson McDaniel 455 SERIES Manual

SERIES455-SCREWED
DIAPHRAGMASSY
DIAPHRAGM*
DIAPHRAGMWASHER
DIAPHRAGMCASE NUTS
&BOLTS
PACKINGASSY
PACKING*
PACKINGNUT
SPRING
BOTTOMPLUG
VALVE BODY
MAINVALVEASSY
MAINVALVE
MAINVALVESEAT
PILOTVALVE&STEM
PILOTVALVESTEMNUT
DIAPHRAGMSTEM
STEM
BOTTOMDIAPHRAGMCASE
REGULATINGSPRING
TOPDIAPHRAGMCASE
VALVE BRACKET
BRACKETLOCKNUT
VALVE BONNET
FLOW
SERIES 455-FLANGED TOPDIAPHRAGMCASE
DIAPHRAGMASSY
DIAPHRAGM*
DIAPHRAGMWASHER
DIAPHRAGMCASENUTS
&BOLTS
BOTTOMDIAPHRAGMCASE
REGULATINGSPRING
SPRINGYOKE
PACKINGASSY
PACKING*
PACKINGNUT
PACKINGGLAND
STEMLOCKNUT
STUDS&NUTS
TOP
PLATE
TOP
PLATE
GASKET*
REGULATINGNUTS
DIAPHRAGMSTEMASSY
DIAPHRAGMSTEM
DIAPHRAGMWASHER
MAINVALVEASSY
MAINVALVE
MAINVALVE SEAT
PILOTVALVE &STEM
PILOTVALVESTEMNUT
BOTTOMPLUG
VALVEBODY
BY-PASS
RELIEF
VALVE
TYPICALINSTALLATION
10 PIPE DIAMETERS MIN.
455
REGULATING
VALVE
LINE
NEEDLE
VALVE
STRAINER
STEAM
SUPPLY
INSTALLATION AND OPERATION
Beforeinstallingthepressureregulatingvalve,besuretoblowoutthe
pipelinetoremoveall dirt,pipescale,pipechips,etc.
WatsonMcDanielrecommendsa'Y'typestrainerbeplacedinthelineon
theinletsideofthepressureregulatingvalve.Abypasslineandhand
shutoff valvesandgaugesshouldbeinstalledoneithersideofthe
regulatingvalveasshowninsketch.
Install theSeries455 pressureregulatingvalveinastraighthorizontal run
ofpipeawayfrom any meters,tees,elbows,etc.whichwouldcauseflow
turbulenceandeffectregulation.Theflowshouldbeinthedirectionof
thearrowonthebodywiththediaphragm chamberabovethecenterline
ofthepipe.However, ifheadroomisscarce,thesecondbestpositionis
toinstallthevalveinaninvertedorientationwiththediaphragm chamber
belowthecenterlineofthepipe..
WARNING:TheSeries455 valveshouldnotbeinstalledinavertical run
ofpipeastheweightofthepartswill causeincreasedwearand
subsequentlyshortenthelifeofthevalve.
Connectacontrollinefrom thetopofthediaphragm chambertothetop
ofthepipingonthedownstream sideofthevalve.Thecontrollineshould
beinstalledapproximately10 pipediametersdownstream ofthevalveina
straightrun ofpipeawayfrom any flowturbulence.Aneedlevalveshould
beinstalledinthiscontrollineforthepurposeofdampeningtheresponse
ofthevalveifrequired.
Onstart-upchecktosee thattheby-pass valveisclosedandthe
downstream pressuregaugeisreadingzero.Theupstream pressure
gaugeshouldindicatethelinepressure,andthehandvalve
son
theinletandoutletsideofthepressureregulatingvalveshould
befull openbeforeadjustingdownstream pressure.
TheSeries455 pressureregulatingvalvesarediaphragm
actuated,springloadedandarenormallyopen.Increasingthe
springcompressionresultsinahigherdownstream pressure,
whiledecreasingthespringcompressionreducesthedown
stream pressure.Onstartup,slowlyincreasedownstream
pressure(onsteamwaitforthepipetoheatandexpand)until
thedesiredpressureisreached.
Thisinstructionsheetisintendedasgeneral informationandis
nottobeinterpretedasspecificinformationonany particular
application.If,afterreadingtheaboveinstructions,youare
uncertainastotheproduct's adaptabilityforyourapplication,
pleasecall factoryorauthorizedrepresentativebeforeinstalling
orusingproduct.
*RecommendedSpareParts
*RecommendedSpareParts
428 JonesBoulevard
LimerickAirportBusiness Center
Pottstown,PA19464
Phone:(610)495
-
5131
Fax:[phone]
www.watsonmcdaniel.com
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INSTRUCTIONPARTNO.2227900REVISION3
EachWatsonMcDanielCompany Productiswarrantedagainstdefectsinmaterialand workmanshipforoneyearfromdateofshipment.Thiswarranty
extendstothefirstretail purchaseronly. All defectivematerialmustbereturnedtothepersonfrom whom youpurchasedtheProduct, transportationprepaid,
free ofany liensorencumbrances,and iffound tobedefectivewill berepairedfreeofchargeorreplaced,atthewarrantor'sorseller'soption.If thematerial
isreplaced,any replacementwillbeinvoicedintheusualmannerand afterinspectionofallegeddefectivematerialanadjustmentwillbemadefor
depreciationcausedby purchaser'suse.Innoeventwill WatsonMcDanielCompany beliabletodomorethanrefund theoriginalcontractprice.Incidental
and consequentialdamagesareexcluded,whetherunderthiswarrantyorotherwise.All impliedwarranties,including warrantiesofmerchantability and
fitnessforaparticularpurpose, aredisclaimedand excluded.
PAGE3
7

OPERATING CONDITIONS:
MAX. INLETPRESSURE250PSIG
MIN. INLET PRESSURE5PSIG
MAX. DIFF.PRESSURE125PSIG
MIN. DIFF. PRESSURE 20%ofinletpressure
1/2" -11/2" SERIES455 INSTRUCTIONS: STEM PACKING REPLACEMENT
1.)IsolateSeries455 fromallsystempressure. It will be necessarytoremovethe
bracket becausethe packing isendless. Back off thebracket locknutand unscrew
stemfromend ofdiaphragmstem.
2.)Removethe actuator-bracket assemblyfromthe valve.
3.)Reachdownalong the Stemwithapicking devicetopullout all the oldPacking
Rings. Becarefulnot toscratchorgouge anyof the sealing surfaces.
4.)Pushthe newPackingRingsintoplace.
5.)Slide Spring intoplaceandhand tighten the Packing Nut.
6.)Reinstall the bracket-actuatorassemblytothe stemand valve.
7.)Bring the regulatorbackon line.
2227900
REV3
PAGE37a

2227900Rev3Page37b