2.5 Ivalvu yeplagi

Ivalvu yeplagi yivalvu esebenzisa umzimba weplagi onomgodi odlulayo njengenxalenye yokuvula nokuvala, kwaye umzimba weplagi ujikeleza ngesiqu sevalvu ukuze kuvuleke kwaye kuvalwe. Ivalvu yeplagi inesakhiwo esilula, ukuvulwa nokuvalwa ngokukhawuleza, kulula ukuyisebenzisa, ukumelana nolwelo oluncinci, iindawo ezimbalwa kunye nobunzima obuncinci. Iivalvu zeplagi ziyafumaneka kwiintlobo ezithe ngqo, ezithe tyaba kunye nezine. Ivalvu yeplagi ethe tyaba isetyenziselwa ukusika i-medium, kwaye iivalvu zeplagi ezineendlela ezintathu nezine zisetyenziselwa ukutshintsha indlela ye-medium okanye ukujika i-medium.

2.6Ivalvu yebhabhathane

Ivalvu yebhabhathane yipleyiti yebhabhathane ejikeleza i-90° ijikeleze i-axis esisigxina emzimbeni wevalvu ukuze igqibezele umsebenzi wokuvula nokuvala. Iivalvu zebhabhathane zincinci ngobukhulu, zilula ngobunzima kwaye zilula ngolwakhiwo, ziqulathe iindawo ezimbalwa kuphela.

Kwaye ingavulwa kwaye ivalwe ngokukhawuleza ngokujikeleza nje i-90°, okulula ukuyisebenzisa. Xa ivalvu yebhabhathane ikwindawo evulekileyo ngokupheleleyo, ubukhulu bepleyiti yebhabhathane yeyona nto ixhathisayo xa i-medium idlula emzimbeni wevalvu. Ke ngoko, ukuhla koxinzelelo oluveliswa yivalvu kuncinci kakhulu, ngoko ke ineempawu ezilungileyo zokulawula ukuhamba. Iivalvu zebhabhathane zahlulwe zibe ziintlobo ezimbini zokutywina: i-elastic soft seal kunye ne-metal hard seal. Ivalvu yokutywina elastiki, iringi yokutywina ingafakwa emzimbeni wevalvu okanye incamathiselwe kumda wepleyiti yebhabhathane. Isebenza kakuhle ekutywineni kwaye ingasetyenziselwa ukuqhobosha, imibhobho ye-vacuum ephakathi kunye ne-corrosive media. Iivalvu ezinezitywina zesinyithi zihlala ixesha elide kuneevalvu ezinezitywina ze-elastic, kodwa kunzima ukufikelela ekutywineni ngokupheleleyo. Zihlala zisetyenziswa kwiimeko apho ukuhla koxinzelelo kunye nokuqhobosha kutshintsha kakhulu kwaye kufuneka ukusebenza kakuhle kokuqhobosha. Izitywina zesinyithi zinokuzivumelanisa nobushushu obuphezulu bokusebenza, ngelixa izitywina ze-elastic zinobuthathaka bokuthintelwa bubushushu.

2.7Ivalvu yokujonga

Ivalvu yokukhangela yivalvu enokuthintela ngokuzenzekelayo ukuhamba kolwelo okungasemva. Idiski yevalvu yokukhangela ivula phantsi kwesenzo soxinzelelo lolwelo, kwaye ulwelo luhamba ukusuka kwicala lokungena ukuya kwicala lokukhupha. Xa uxinzelelo kwicala lokungena luphantsi kunecala lokukhupha, idiski yevalvu ivala ngokuzenzekelayo phantsi kwesenzo somahluko woxinzelelo lolwelo, ubunzima bayo kunye nezinye izinto zokuthintela ulwelo ukuba lungabuyeli umva. Ngokwemo yesakhiwo, inokwahlulwa ibe yivalvu yokujonga i-lift kunye nevalvu yokujonga i-swing. Uhlobo lokuphakamisa lunokutywinwa okungcono kunye nokumelana nolwelo olukhulu kunohlobo lwe-swing. Kwi-inlet yokungenisa yombhobho wokudonsa wepompo, kufuneka kusetyenziswe ivalvu esezantsi. Umsebenzi wayo kukugcwalisa umbhobho wokungenisa wepompo ngamanzi ngaphambi kokuba uqalise ipompo; emva kokumisa ipompo, gcina umbhobho wokungenisa kunye nomzimba wepompo uzele ngamanzi ukulungiselela ukuqala kwakhona. Ivalvu esezantsi ngokubanzi ifakwe kuphela kumbhobho othe nkqo kwindawo yokungenisa yepompo, kwaye i-medium ihamba ukusuka ezantsi ukuya phezulu.

2.8Ivalvu ye-diaphragm

Inxalenye yokuvula nokuvala yevalvu yediaphragm yidiaphragm yerabha, ebekwe phakathi komzimba wevalvu kunye nesigqubuthelo sevalvu.

Inxalenye ephakathi ephumayo yediaphragm inamathele kwisiqu sevalvu, kwaye umzimba wevalvu ugqunywe ngerabha. Ekubeni i-medium ingangeni ngaphakathi kwesiciko sevalvu, isiqu sevalvu asifuni bhokisi yokuzalisa. Ivalvu yediaphragm inesakhiwo esilula, ukusebenza kakuhle kokutywina, ukulungiswa okulula, kunye nokumelana nolwelo oluphantsi. Iivalvu zeDiaphragm zahlulwe ngohlobo lwe-weir, uhlobo oluthe tye, uhlobo lwe-engile yasekunene kunye nohlobo lokuhamba ngqo.

3. Imiyalelo yokukhetha iivalvu esetyenziswa rhoqo

3.1 Imiyalelo yokukhetha iivalvu zesango

Kwiimeko eziqhelekileyo, iivalvu zesango kufuneka zikhethwe. Ukongeza ekubeni zifanelekile kumphunga, ioyile kunye nezinye izinto ezisetyenziswayo, iivalvu zesango zikwafanelekile kwizinto ezisetyenziswayo eziqulethe izinto eziqinileyo eziqinileyo kunye ne-viscosity ephezulu, kwaye zifanelekile kwiivalvu kwiinkqubo zokungenisa umoya kunye neenkqubo zokukhupha umoya eziphantsi. Kwizinto ezisetyenziswayo eziqulethe izinto eziqinileyo, umzimba wevalvu yesango kufuneka uxhotyiswe ngemingxuma yokucoca enye okanye emibini. Kwizinto ezisetyenziswayo ezisebenzisa ubushushu obuphantsi, kufuneka kukhethwe iivalvu zesango ezikhethekileyo ezisebenzisa ubushushu obuphantsi.

3.2 Imiyalelo yokukhetha iivalvu zokumisa

Ivalvu yokumisa ifanelekile kwiipayipi ezineemfuno zokuyekelela kulwelo, oko kukuthi, ukulahleka koxinzelelo akujongwa kakhulu, kunye neepayipi okanye izixhobo ezinobushushu obuphezulu kunye nemidiya yoxinzelelo oluphezulu. Ifanelekile kwipayipi yomphunga kunye neminye imibhobho ephakathi ene-DN <200mm; iivalvu ezincinci zingasebenzisa iivalvu ezisikiweyo. Iivalvu, ezifana neevalvu zeenaliti, iivalvu zezixhobo, iivalvu zesampulu, iivalvu zokulinganisa uxinzelelo, njl.njl.; iivalvu zokumisa zinokulungiswa kokuhamba okanye ukulungiswa koxinzelelo, kodwa ukuchaneka kokulungiswa akufuneki, kwaye ububanzi bombhobho buncinci, ngoko ke ivalvu yokumisa okanye ivalvu yokuthomalalisa kufuneka kusetyenziswe iValve; Kwimidiya enobuthi obukhulu, kufuneka kusetyenziswe ivalvu yokumisa evaliweyo; nangona kunjalo, ivalvu yokumisa akufuneki isetyenziswe kwimidiya ene-viscosity ephezulu kunye nemidiya equlethe amasuntswana athambekele ekutsalweni yinkunkuma, kwaye akufuneki isetyenziswe njengevalvu yomoya kunye nevalvu kwinkqubo ye-vacuum ephantsi.

3.3 Imiyalelo yokukhetha ivalvu yebhola

Iivalvu zebhola zifanelekile kwiimidiya ezisebenzisa ubushushu obuphantsi, uxinzelelo oluphezulu, kunye ne-viscosity ephezulu. Uninzi lweevalvu zebhola zingasetyenziswa kwiimidiya ezinee-slid particles ezixhonyiweyo, kwaye zingasetyenziswa nakwiimidiya ezi-powdery kunye ne-granular ngokweemfuno zezinto zokuvala; iivalvu zebhola ze-full-channel azifanelekanga ukulawula ukuhamba kwamanzi, kodwa zifanelekile kwiimeko ezifuna ukuvulwa nokuvalwa ngokukhawuleza, okulula ukuzisebenzisa. Ukuvalwa okungxamisekileyo kwiingozi; kudla ngokucetyiswa kwiipayipi ezine-sealability engqongqo, ukuguguleka, imijelo yokuncipha, iintshukumo zokuvula nokuvala ngokukhawuleza, i-high-pressure cutoff (umahluko omkhulu woxinzelelo), ingxolo ephantsi, i-gasification, i-torque encinci yokusebenza, kunye nokumelana nolwelo oluncinci. Sebenzisa iivalvu zebhola; iivalvu zebhola zifanelekile kwizakhiwo zokukhanya, ii-slicing eziphantsi koxinzelelo, kunye nee-corrosive media; iivalvu zebhola nazo zezona valve zifanelekileyo kwiimidiya ezisebenzisa ubushushu obuphantsi kunye ne-cryogenic. Kwiinkqubo zepayipi kunye nezixhobo ezinemidiya ezisebenzisa ubushushu obuphantsi, iivalvu zebhola ezisebenzisa ubushushu obuphantsi ezinee-valve covers kufuneka zisetyenziswe; khetha Xa usebenzisa ivalvu yebhola edadayo, izinto zayo zokuhlala kufuneka zithwale umthwalo webhola kunye ne-medium esebenzayo. Iivalvu zebhola ezinobubanzi obukhulu zifuna amandla amakhulu ngexesha lokusebenza. Iivalvu zebhola ezine-DN ≥ 200mm kufuneka zisebenzise i-worm gear transmission; iivalvu zebhola ezizinzileyo zifanelekile kwiidayamitha ezinkulu nakwiimeko zoxinzelelo oluphezulu; ukongeza, iivalvu zebhola ezisetyenziswa kwimibhobho yenkqubo yezinto ezinobuthi obukhulu kunye nezixhobo ezitshayo kufuneka zibe nezakhiwo ezingatshiyo nezichasene nomlilo.

3.4 Imiyalelo yokukhetha ivalvu yomphunga

Ivalvu yokuthambisa ifanelekile kwiimeko apho ubushushu obuphakathi buphantsi kwaye uxinzelelo luphezulu. Ifanelekile kwiindawo ezifuna ukulungisa isantya sokuhamba kunye noxinzelelo. Ayifanelekanga kwiindawo ezine-viscosity ephezulu kunye namasuntswana aqinileyo, kwaye ayifanelekanga ukusetyenziswa njengevalvu yokuzihlukanisa.

3.5 Imiyalelo yokukhetha ivalvu yeplagi

Ivalvu yeplagi ifanelekile kwiimeko ezifuna ukuvulwa nokuvalwa ngokukhawuleza. Ngokuqhelekileyo ayifanelekanga kumphunga nakwindawo ephakathi enobushushu obuphezulu. Isetyenziselwa indawo ephakathi enobushushu obuphantsi kunye ne-viscosity ephezulu, kwaye ikwafanelekile nakwindawo ephakathi enamasuntswana axhonyiweyo.

3.6 Imiyalelo yokukhetha ivalvu yebhabhathane

Iivalvu zebhabhathane zifanelekile kwiimeko ezinobubanzi obukhulu (ezifana ne-DN﹥600mm) kunye nobude obufutshane besakhiwo, kunye neemeko apho kufuneka ukulungiswa kokuhamba kwamanzi kunye nokuvulwa nokuvalwa ngokukhawuleza. Zisetyenziswa ngokubanzi kwiimveliso zamanzi, ioyile kunye noxinzelelo olunamaqondo obushushu angama-≤80°C kunye noxinzelelo oluyi-≤1.0MPa. Umoya kunye nezinye izinto; kuba ukulahleka koxinzelelo lweevalvu zebhabhathane kukhulu xa kuthelekiswa neevalvu zesango kunye neevalvu zebhola, iivalvu zebhabhathane zifanelekile kwiinkqubo zemibhobho ezineemfuno zokulahlekelwa koxinzelelo olukhululekileyo.

3.7 Jonga imiyalelo yokukhetha iivalvu

Iivalvu zokukhangela ngokubanzi zifanelekile kwiindawo ezicocekileyo kwaye azifanelekanga kwiindawo ezixineneyo ezinamasuntswana aqinileyo kunye ne-viscosity ephezulu. Xa i-DN ≤ 40mm, kufuneka kusetyenziswe ivalvu yokujonga ukuphakama (ivunyelwe ukufakwa kuphela kwiipayipi ezithe tye); xa i-DN = 50 ~ 400mm, kufuneka kusetyenziswe ivalvu yokujonga ukuphakama kwe-swing (ingafakwa kwiipayipi ezithe tye nezithe nkqo, Ukuba ifakwe kwipayipi ethe nkqo, indlela yokuhamba ephakathi kufuneka ibe ukusuka ezantsi ukuya phezulu); xa i-DN ≥ 450mm, kufuneka kusetyenziswe ivalvu yokujonga i-buffer; xa i-DN = 100 ~ 400mm, ivalvu yokujonga i-wafer nayo ingasetyenziswa; ivalvu yokujonga ukuphakama kwe-swing. Ivalvu yokubuyisela ingenziwa ukuba ibe noxinzelelo oluphezulu kakhulu lokusebenza, i-PN ingafikelela kwi-42MPa, kwaye ingafakwa kuyo nayiphi na indawo yokusebenza kunye nayo nayiphi na indawo yobushushu bokusebenza kuxhomekeke kwizinto zegobolondo kunye nezitywini. Indawo yokusebenza ngamanzi, umphunga, igesi, indawo ebolileyo, ioyile, amayeza, njl. Uluhlu lobushushu bokusebenza kwendawo yokusebenza luphakathi kwe--196 ~ 800℃.

3.8 Imiyalelo yokukhetha ivalvu yeDiaphragm

Ivalvu ye-diaphragm ifanelekile kwioyile, amanzi, i-acidic media kunye ne-media equlethe izinto eziqinileyo ezixhonyiweyo ezinobushushu obungaphantsi kwama-200°C kunye noxinzelelo olungaphantsi kwe-1.0MPa. Ayifanelekanga kwi-organic solvents kunye ne-oxidant enamandla. Iivalvu ze-diaphragm zohlobo lwe-Weir kufuneka zikhethwe kwi-abrasive granular media. Xa ukhetha ivalvu ye-diaphragm yohlobo lwe-weir, jonga kwitheyibhile yeempawu zokuhamba kwayo; ii-viscous fluids, i-samente slurry kunye ne-precipitating media kufuneka zisebenzise iivalvu ze-diaphragm ezithe tye; ngaphandle kweemfuno ezithile, iivalvu ze-diaphragm akufuneki zisetyenziswe kwimibhobho ye-vacuum kunye nezixhobo ze-vacuum.