Fisher Control Valve
SEATLESS, HARDSEAT AND UNIT TANDEM
Designed for blow-off service in boiler systems with pressures of 3206 psig
FEATURES
•DesignedaccordingASMEsection1,ASMEB31.1,ASMEB16.34.
•Forboilersystemsupto3206psig.
•Ruggedconstructiontowithstandhighpressureandhighvelocities.
•Excellentresistancetocleaningacidsandwearcausedbyprecipitatedsolids.
Seatless valves
•NoSeat
-willnotscoreorplugwithdirt
-will notleak
•Live-loadedpacking
-willnotleakafterpacking
•Slowopening
-will not rapidly drain boiler drum
Unit tandem valves
•Combinationofhardseatandseatlessvalvesinasinglebody
-eliminates pipejoints
-reduces potentialleaks
-fitsintoaconfinedspace
Hardseat valves
•Stellite seatfaces
-resistswear
provideslongservicelife
GENERAL APPLICATIONof
Blow-offserviceinboilersystemstoremovedirt,sedimentandscaleaswellasmaintainboiler levelsurge.
Sizerange:NPS1,1¼,1½,2,2½
TECHNICAL DATA
[DN25,32,40,50,65]
PressureRating:Up to 3206psiConnection:Flanged, Socketweld, ButtweldMaterials:CastIron,CarbonSteel
GENERAL DESCRIPTIONof
Basicrequirementsforthedesignanduseof blow-offvalvesareestablishedbytheASMEPowerBoilerCode,Sectionl.Thegeneralformofavalve,thematerialsofitsconstruction,allowableboilerpressures,andtheinstallationofthevalvearealldeterminedbythecode.
Yarway blow-off valves are designed inconformance with all coderequirements(ASMESectionl,ASMEB31.1,ASMEB16.34).
Becausetheprimarypurposeofablow-off valveisremovalofdirt,sedimentandscale,theboilercoderequiresthatvalveswhichhavedamsorpocketsinwhichsedimentcanaccumulatecannotbeusedinblow-offservice.Thismeansthatordinaryglobevalvescannotbeusedasblow-offvalves.
are especially designed for the punishment of blow-off service in boilersystems with pressures of 3206 psi.
Theruggedconstructionofthesecansuccessfully withstand the combination of problemsinherentintheservice-aserviceinwhich high pressures result in high velocities whichcancausewiredrawingandcavitationofmetalsurfaces.
Thevalvesmustalsowithstandthecorrosiveenvironmentcreatedbyacidcleaningofboilers,and the potential wear problems caused byprecipitatedsolids.
Thevalvesarealsohelpfulinmaintainingboilerlevel surge within desirable limits during quickstartupofhighpressuresystems.
TwobroadcategoriesofYarwayblow-offvalvesareavailable;thosethatoperateonaslidingprincipleandthosethatoperateonaseat-and-discprinciple.
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