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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