fully lined valves for sulfuric acid services pdfs/chemvalve fully … · fully lined valves for...
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FULLYLINEDVALVESFORSULFURICACIDSERVICES
Applica5onDescrip5on:TheuseofconcentratedsulfuricacidforpHcontrolinwaterandwastewatertreatment,agriculture,bio‐energyandchemicalprocessesiso:enthebestchoiceduetothereadyavailability,lowcostandeffec=venessofthisacid.Forexample,inthepulpandpaperindustry,thesulfuricacidisusedtoadjustthepHofthechlorinedioxidebeinggeneratedforthebleachtowers.Handlingandinjec=onoftheacidrequiressomespecialconsidera=onsforallvalvescurrentlybeingusedintheconcentratedsulfuricacidinjec=onsystems.
IssueswithApplica5on:• Lackof=ghtshutofffromthecheck
valves.Sulfuricacidhasagreataffinityforwater.Itwill“drawthrough”thecheckvalvethewater(orprocessfluid)fromthemixingteesideifthereisnotenough“seatload”toassure=ghtshutoffofthecheckvalve.
• Controlvalvesbeingusedarenotprovidingthebestrangeofcontrolforthisdifficultapplica=on.
ChemValveSolu5ons:• ChemValverecommendsourmodel880SHCfullylinedballcheckvalve
withahighratespringthatrequires10psiofdifferen=alpressureacrossthecheckvalve,inthenormal“flow”direc=on,tocracktheballofftheseat.Thisinsuresthatwhenthecheckvalveintheclosedposi=on,itwillhaveadequate“seatload”topreventthemigra=onofwaterbackintothesulfuricacid.ChemValvealsorecommendsourPFAlinermaterialfortheconcentratedsulfuricacidvalvesduetothepossibleheatbuildupfromthisapplica=on.
• Inchlorinedioxideservice,ChemValverecommendsthatthespringforthecheckvalvesbemadeof=tanium.HastelloyChascannotstandupover=meinthechlorinedioxideservice.ChemValvealsorecommendsthePVDF(Kynar)linermaterialforthedilutesulfuricacidserviceiftheprocessfluidischlorinedioxidetoleachingthroughtheliner.
• Controlvalvesusedintheseapplica=onswillnormallyrequirealargerangeabilityvalve.ChemValvecanhandlethiswithourModel790EB‐150withourV‐Portseatdesign.
MODEL880SHC MODEL790EBV‐PORTSEAT