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