Valve soj ntsuam ib ntus thiab ceev faj ua ntej thiab tom qab kev teeb tsa valve khoom siv cov lus piav qhia nruab nrab

Kev tshuaj xyuas lub cev thiab kev ceev faj ua ntej thiab tom qab kev teeb tsa valve cov khoom siv nruab nrab piav qhia Lub plhaub ntsuas lub siab ntawm lub valve yog 1.5 npaug ntawm qhov kev tso cai loj dua thaum lub valve nyob ntawm 20 ℃, thiab qhov kev sib khi yog 1.1 npaug ntawm kev ua haujlwm loj dua. siab thaum lub valve nyob ntawm 20 ℃. Lub sijhawm xeem yuav tsum tsis pub tsawg tshaj 5 feeb. Qhov ntsuas kub yog 5 ~ 40 ℃. (4) Kev pov thawj ntawm kev ruaj ntseg valve yuav tsum ua raws li cov kev cai ntawm lub teb chaws tam sim no cov qauv thiab cov ntaub ntawv tsim qauv rau kev teeb tsa kev hloov siab thiab kev ntsuas kev sib khi. Kev nyab xeeb valve yuav tsum tau sau zoo, kaw, muab ib daim ntawv txheeb xyuas. (1) Lub valve yuav tsum raug tshuaj xyuas kom pom qhov zoo ua ntej kev teeb tsa, lub valve lub cev yuav tsum tsis tu ncua, lub tshuab qhib yuav tsum hloov pauv, lub qia valve yuav tsum tsis txhob skewed, deformed, jammed, thiab kos npe yuav tsum ua kom tiav. (2) Valve lub plhaub siab ntsuas thiab ntsuas kev sib khi yuav tsum tau ua tiav, lub plhaub valve lub siab ntsuas thiab ntsuas kev sib khi yuav tsum yog cov dej huv raws li qhov nruab nrab, stainless hlau valve kuaj, cov ntsiab lus ntawm chloride ion hauv dej yuav tsum tsis pub tshaj 25ppm. (3) lub plhaub ntsuas lub siab ntawm lub valve yog 1.5 npaug ntawm qhov loj dua qhov tso cai ua haujlwm siab thaum lub valve nyob ntawm 20 ℃, thiab qhov kev sib khi yog 1.1 npaug ntawm qhov loj dua qhov tso cai ua haujlwm siab thaum lub valve nyob ntawm 20 ℃. Lub sijhawm xeem yuav tsum tsis pub tsawg tshaj 5 feeb. Qhov ntsuas kub yog 5 ~ 40 ℃. (4) Kev pov thawj ntawm kev ruaj ntseg valve yuav tsum ua raws li cov kev cai ntawm lub teb chaws tam sim no cov qauv thiab cov ntaub ntawv tsim qauv rau kev teeb tsa kev hloov siab thiab kev ntsuas kev sib khi. Kev nyab xeeb valve yuav tsum tau sau zoo, kaw, muab ib daim ntawv txheeb xyuas. Valve cov khoom siv nruab nrab cov lus piav qhia valve cov khoom siv nruab nrab cov lus piav qhia: 1, valve feem ntau siv cov khoom ua haujlwm (1) Hlau (1) Grey cam khwb cia hlau: xws li HT200, HT250, thiab lwm yam., haum rau PN≤16, kev ua haujlwm kub ntawm -10 ℃ ~ 100 ℃ roj, cov kua nruab nrab (dej, chav, roj av, thiab lwm yam); PN≤10, ua haujlwm kub ntawm -10 ℃ ~ 200 ℃ chav dej, qhov dav dav ntawm cov pa roj, roj, ammonia thiab lwm yam xov xwm (ammonia, cawv, aldehyde, ether, ketone, ester thiab lwm yam xov xwm corrosive tsawg). Nws tsis haum rau hydrochloric acid, nitric acid thiab lwm yam xov xwm. Tab sis nws tuaj yeem siv tau rau hauv cov concentrated sulfuric acid, vim hais tias cov concentrated sulfuric acid tuaj yeem tsim cov purified zaj duab xis ntawm nws cov hlau los tiv thaiv corrosion ntawm cam khwb cia hlau los ntawm concentrated sulfuric acid. (2) malleable cam khwb cia hlau: xws li KTH350-10, KTH450-06, thiab lwm yam., haum rau PN≤25, ua hauj lwm kub ntawm -10 ℃ ~ 300 ℃ ntawm chav dej, cov khoom dav dav ntawm roj thiab kua, roj thiab lwm yam xov xwm. Nws corrosion kuj zoo ib yam li grey cam khwb cia hlau. ③ Nodular cam khwb cia hlau: xws li QT400-15, QT450-10, thiab lwm yam, haum rau PN≤25 ua haujlwm kub ntawm -10 ℃ ~ 300 ℃ chav, roj thiab roj thiab lwm yam xov xwm. Nws corrosion kuj muaj zog, muaj peev xwm ua hauj lwm nyob rau hauv ib tug tej yam concentration ntawm sulfuric acid, nitric acid, acid ntsev. Tab sis tsis resistant rau fluoric acid, muaj zog alkali, hydrochloric acid thiab ferric chloride kub tov corrosion. Siv kom tsis txhob muaj cua sov tam sim ntawd, txias txias, txwv tsis pub nws yuav tawg. (4) nickel cam khwb cia hlau: alkali tsis kam tshaj grey cam khwb cia hlau, nodular cam khwb cia hlau valve; Nickel cam khwb cia hlau yog cov khoom siv zoo tagnrho rau dilute sulfuric acid, dilute hydrochloric acid thiab caustic soda. (2) carbon steel Carbon steel muaj WCA, WCB thiab WCC, haum rau chav, tsis-corrosive gas, roj thiab lwm yam khoom thiab lwm yam xov xwm nrog ua hauj lwm kub ntawm -29 ~ 425 ℃. (3) stainless hlau Lub 304 series ntawm stainless hlau feem ntau yog siv rau kev ua hauj lwm kub ntawm -196 ℃ ~ 650 ℃ chav, tsis-corrosive gas, roj thiab lwm yam khoom thiab lwm yam xov xwm; Corrosive media nrog kev ua haujlwm kub ntawm -30 ℃ thiab 200 ℃. Nws muaj cov pa roj zoo heev, tiv thaiv nitric acid thiab lwm yam oxidizing media, tab sis kuj alkali, dej, ntsev, organic acid thiab lwm yam organic compounds corrosion. Tab sis nws tsis resistant rau sulfuric acid, hydrochloric acid thiab lwm yam uas tsis yog-oxidizing acid corrosion, kuj yog tsis resistant rau qhuav hydrogen chloride, oxidizing chloride thiab oxalic acid, lactic acid thiab lwm yam organic acids. ② Raws li 304 nrog 2% ~ 3% molybdenum 316 series stainless hlau, nws cov corrosion kuj zoo dua li 304 series stainless hlau, nws zoo dua chromium nickel stainless hlau nyob rau hauv non-oxidizing acid thiab kub organic acid, chloride corrosion kuj. dua li chromium nickel stainless hlau, corrosion kuj zoo. 321, 347 series stainless hlau uas muaj titanium los yog niobium muaj zog tiv thaiv intergranular corrosion. ④ Muaj cov chromium siab, siab nickel 904L series stainless hlau, nws cov corrosion kuj yog siab dua li cov hlau tsis huv, tuaj yeem siv los daws cov sulfuric acid, phosphoric acid, tov kua qaub, sulfite, organic acid, alkali, ntsev tov, hydrogen sulfide, thiab lwm yam, thiab txawm tuaj yeem siv rau qee qhov kev xav tau ntawm qhov kub thiab txias. Tab sis tsis resistant rau concentrated los yog kub hydrochloric acid, ntub fluorine, chlorine, bromine, iodine, aqua regia corrosion. (4) Copper alloy Copper alloy yog tsim rau PN≤25, kev khiav hauj lwm kub ntawm -40 ℃ ~ 180 ℃ oxygen, seawater yeeb nkab li qub, nws muaj corrosion kuj zoo rau dej, seawater, ntau yam ntsev tov, organic teeb meem. Nws muaj kev tiv thaiv zoo rau sulfuric acid, phosphoric acid, acetic acid thiab dilute hydrochloric acid tsis muaj oxygen lossis oxidant, thiab muaj kev tiv thaiv zoo rau alkali. Tab sis nws tsis resistant rau corrosion ntawm nitric acid, concentrated sulfuric acid thiab lwm yam oxidizing acids, thiab nws tsis resistant rau corrosion ntawm molten hlau, sulfur thiab sulfide. Tsis txhob sib cuag nrog ammonia, uas tuaj yeem ua rau muaj kev ntxhov siab corrosion ntawm tooj liab thiab tooj liab alloy. Kev saib xyuas yuav tsum tau them rau kev xaiv ntawm tooj liab alloy, nws cov corrosion kuj muaj qee qhov sib txawv. (5) Aluminium alloy muaj qhov zoo corrosion tsis kam rau oxidizing concentrated nitric acid thiab tuaj yeem tiv taus cov organic acids thiab cov kuab tshuaj. Tab sis nyob rau hauv txo nruab nrab, muaj zog acid, muaj zog puag corrosion kuj. Cov ntshiab txhuas ntau dua, qhov zoo dua yog tiv thaiv corrosion, tab sis nws lub zog txo qis thiab tsuas yog siv tau rau lub siab tsis tshua muaj siab lossis valve linings. (6) Titanium alloy Titanium alloy yog tsim rau PN≤25, kev khiav hauj lwm kub ntawm -30 ℃ ~ 316 ℃ dej hiav txwv, chloride, oxidizing acid, organic acid, alkali thiab lwm yam xov xwm. Titanium yog cov hlau nquag thiab tuaj yeem tsim oxide zaj duab xis nrog corrosion kuj zoo ntawm chav tsev kub. Nws muaj peev xwm ntawm seawater, ntau yam chloride thiab hypochlorite, chlorine, oxidizing acid, organic acid, alkali thiab lwm yam corrosion. Tab sis nws tsis yog resistant rau ntau ntshiab txo acid, xws li sulfuric acid, hydrochloric acid corrosion, tab sis kuj rau oxidizing acid corrosion. Titanium valve muaj kev tiv thaiv zoo rau qhov erosion. Tab sis nyob rau hauv cov pa luam yeeb liab nitric acid, chloride, methanol thiab lwm yam xov xwm yuav tsim kev ntxhov siab corrosion. (7) Zirconium alloy Zirconium kuj belongs rau cov hlau nquag, nws tuaj yeem tsim cov oxide zaj duab xis, nws muaj corrosion kuj zoo rau nitric acid, chromic acid, alkali, molten alkali, ntsev kua, urea, seawater, tab sis tsis hydrofluoric acid, concentrated. sulfuric acid, aqua regia corrosion, kuj tsis resistant rau ntub chlorine thiab oxidizing hlau chloride corrosion. (8) Ceramics Ceramic valve yog muab qhov tseem ceeb rau nrog silicon dioxide fusion sintering, xws li zirconia, alumina, silicon nitride, thiab lwm yam., ntxiv rau muaj qhov hnav tsis kam, kub tsis kam, rwb thaiv tsev kev ua tau zoo, kuj muaj kev tiv thaiv corrosion siab heev. muaj peev xwm, ntxiv rau tsis muaj oxygen fluorine acid, fluosilicic acid thiab alkali resistant, muaj peev xwm ua kom sov concentrated nitric acid, hydrochloric acid, aqua regia, ntsev tov thiab organic solvents xws li nruab nrab, feem ntau siv rau PN nyob rau hauv kab 6 los yog tsawg dua. Qhov no valve xws li kev siv lwm yam ntaub ntawv, thaum xaiv, yuav tsum xav txog cov corrosion kuj ntawm lwm yam ntaub ntawv. (9) iav fiber reinforced yas Lub corrosion kuj ntawm FRP nws txawv nrog nws cov nplaum. Epoxy resin FRP tuaj yeem siv rau hauv hydrochloric acid, phosphoric acid, dilute sulfuric acid thiab qee cov organic acids; Lub corrosion kuj ntawm phenolic fiber reinforced yas yog zoo dua. Furan FRP muaj qhov zoo alkali tsis kam, acid tsis kam thiab kev tiv thaiv corrosion, uas feem ntau haum rau PN≤16 pipeline. (10) Cov yas yas li qub yog cov yam ntxwv ntawm kev tiv thaiv corrosion, thiab txawm tias cov hlau li qub tsis tuaj yeem muaj qhov zoo. Feem ntau siv tau rau PN≤6 cov kav dej, nrog rau ntau hom yas, nws qhov sib txawv corrosion kuj zoo heev. (1) Nylon, tseem hu ua polyamide, nws yog cov thermoplastic, muaj kev tiv thaiv corrosion zoo. Nws tuaj yeem tiv thaiv corrosion ntawm dilute acid, ntsev thiab alkali, thiab muaj corrosion kuj zoo rau hydrocarbon, ketone, ether, ester thiab roj. Tab sis tsis resistant rau muaj zog acid, oxidizing acid, phenol thiab formic acid corrosion. (2) POLYvinyl chloride: polyvinyl chloride yog cov yas thermoplastic, muaj kev tiv thaiv corrosion zoo heev. Acid, alkali, ntsev, organic teeb meem. Tsis resistant rau concentrated nitric acid, fuming sulfuric acid, acetic anhydride, ketone, halogenated, aromatic thiab lwm yam corrosion. (3) POLYETHYLENE: polyethylene muaj corrosion kuj zoo heev, nws muaj corrosion kuj zoo rau hydrochloric acid, dilute sulfuric acid, hydrofluoric acid thiab lwm yam non-oxidizing acids nrog rau dilute nitric acid, alkali, ntsev tov thiab organic solvent nyob rau hauv chav tsev kub. Tab sis tsis resistant rau concentrated nitric acid, sulfuric acid thiab lwm yam muaj zog oxidant corrosion. (4) polypropylene: polypropylene yog cov thermoplastic, nws cov corrosion kuj zoo ib yam li polyethylene, me ntsis zoo dua polyethylene. Nws tuaj yeem tiv taus cov organic acid feem ntau, inorganic acid, alkali, ntsev, tab sis kom muaj zog nitric acid, fuming sulfuric acid, chlorsulfonic acid thiab lwm yam muaj zog oxidizing acid corrosion kuj tsis zoo. ⑤ Phenolic plastics: phenolic plastics tuaj yeem tiv taus corrosion ntawm hydrochloric acid, dilute sulfuric acid, phosphoric acid thiab lwm yam uas tsis yog-oxidizing acid, ntsev tov. Tab sis tsis tiv taus nitric acid, chromic acid thiab lwm yam muaj zog oxidizing acid, alkali thiab qee cov organic solvents corrosion. ⑥ Chlorinated polyether, tseem hu ua polychlorinated ether, yog linear, siab crystallinity ntawm thermoplastics. Nws muaj kev tiv thaiv corrosion zoo heev, * qis dua cov fluorine plastics. Nws muaj peev xwm ntawm concentrated sulfuric acid, concentrated nitric acid sab nraum txhua yam kua qaub, alkali, ntsev thiab feem ntau cov organic solvents corrosion, tab sis tsis resistant rau kua chlorine, fluorine, bromine corrosion. ⑦ Polytrifluorovinyl chloride: nws thiab lwm yam fluorine plastics, muaj corrosion kuj zoo heev thiab lwm yam khoom, corrosion kuj me ntsis qis dua ptfe. Nws muaj kev tiv thaiv zoo rau cov organic acid, inorganic acid, alkali, ntsev thiab ntau yam organic solvents. Qee cov kuab tshuaj muaj halogens thiab oxygen uas ua rau lawv o ntawm qhov kub thiab txias. Nws tsis tiv taus kub kub fluorine, fluoride, molten alkali, concentrated nitric acid, aromatic, fuming nitric acid, molten alkali hlau, thiab lwm yam. , chlorine trifluoride, oxygen trifluoride ntawm qhov kub thiab txias, siab txaus ntawm cov kua fluorine, yuav luag tag nrho cov corrosion ntawm chemical media, qhov tsis zoo yog tias nws muaj dej txias. (11) Sab hauv Vim tias tsis muaj zog ntawm cov yas, ntau li qub siv cov ntaub ntawv hlau los ua lub plhaub, nrog cov yas, roj hmab hauv ob sab phlu. Lined li qub feem ntau haum rau PN≤16 cov kav dej, nrog cov ntaub ntawv sib txawv, nws qhov kub tsis kam, corrosion kuj tsis zoo ib yam. Yas hauv ob sab phlu: Qhov kev tiv thaiv corrosion ntawm cov yas hauv ob sab phlu yog tib yam li cov khoom siv hauv cov yas saum toj no. Txawm li cas los xij, thaum xaiv, qhov kev tiv thaiv corrosion ntawm lwm cov ntaub ntawv siv hauv cov yas lined li qub yuav tsum raug txiav txim siab. Rubber hauv ob sab phlu: roj hmab yog mos, ntau li qub siv cov roj hmab hauv ob sab phlu los txhim kho corrosion kuj thiab sealing kev ua tau zoo ntawm lub valve. Kev tiv thaiv corrosion ntawm roj hmab sib txawv heev nrog ntau hom roj hmab. Tom qab vulcanization ntawm ntuj roj hmab tuaj yeem tiv taus tsis-oxidizing acid, alkali, ntsev corrosion, tab sis tsis tiv taus cov oxidants muaj zog, xws li nitric acid, chromic acid, concentrated sulfuric acid corrosion, kuj tsis tiv taus cov khoom siv roj av thiab qee cov organic solvents corrosion: yog li ntawd , ntuj roj hmab tau maj mam hloov los ntawm hluavtaws roj hmab. NBR hauv cov roj hmab hluavtaws muaj roj zoo, tab sis nws tsis tiv taus oxidation acid, aromatic hydrocarbon, ester, ketone, ether thiab lwm yam muaj zog hnyav corrosion; fluorine roj hmab muaj kev tiv thaiv corrosion zoo heev, tuaj yeem tiv taus txhua yam ntawm cov kua qaub, alkali, ntsev, roj av, hydrocarbons, thiab lwm yam, tab sis qhov hnyav kuj tsis zoo li fluorine plastics; Polyether roj hmab tuaj yeem siv rau hauv dej, roj, ammonia, alkali thiab lwm yam xov xwm. Lead hauv ob sab phlu: txhuas yog cov hlau nquag siv, tab sis vim nws cov khoom muag, nws feem ntau siv los ua cov hauv ob sab phlu tshwj xeeb. Cov khoom siv corrosion ntawm cov hlau lead yog cov txheej txheem tiv thaiv muaj zog. Nws yog cov khoom nto moo uas tiv taus sulfuric acid. Nws muaj kev tiv thaiv corrosion siab hauv phosphoric acid, chromic acid, carbonic acid thiab nruab nrab cov tshuaj, dej hiav txwv thiab lwm yam xov xwm, tab sis nws tsis tiv taus alkali thiab hydrochloric acid corrosion, thiab tsis haum rau kev ua haujlwm hauv lawv cov khoom siv corrosion.