Ngokungeniswa kweemfuno zemathiriyeli ekrwada, iimfuno zoyilo, iimfuno zokuvelisa, iimfuno zokusebenza, iindlela zovavanyo, iimfuno zesicelo senkqubo, kunye nobudlelwane phakathi koxinzelelo kunye nobushushu kwimveliso yevalvu yeplastiki yamazwe ngamazwe kunye nemigangatho yendlela yokuvavanya, unokuqonda ukutywinwa okufunekayo kwiplastiki. iivalvu Iimfuno zolawulo lomgangatho osisiseko ezifana novavanyo, uvavanyo lwetorque kunye novavanyo lwamandla okudinwa.Ngokwetheyibhile, iimfuno zovavanyo lokutywinwa kwesitulo, uvavanyo lokutywina umzimba wevalvu, uvavanyo lwamandla evalvu yomzimba, uvavanyo lwevalvu yexesha elide, uvavanyo lwamandla okudinwa kunye netorque yokusebenza efunekayo kwiimfuno zokusebenza kweemveliso zeplasitiki zevalvu ziyashwankathelwa.Ngokuxoxwa kweengxaki ezininzi kwimigangatho yamazwe ngamazwe, abavelisi kunye nabasebenzisi beevalvu zeplastiki bavusa inkxalabo.

Njengoko umlinganiselo wemibhobho yeplastiki kunikezelo lwamanzi ashushu nabandayo kunye nezicelo zobunjineli bemibhobho yemizi-mveliso iqhubeka nokukhula, ulawulo lomgangatho weevalvu zeplastiki kwiinkqubo zemibhobho yeplastiki lubaluleka ngakumbi nangakumbi.

Ngenxa yeenzuzo zobunzima bokukhanya, ukuxhathisa kwe-corrosion, i-non-adsorption of scale, ukudibanisa okudibeneyo kunye nemibhobho yeplastiki, kunye nobomi benkonzo ende yeevalvu zeplastiki, iivalvu zeplastiki zisetyenziselwa ukubonelela ngamanzi (ingakumbi amanzi ashushu kunye nokufudumeza) kunye nolunye ulwelo lwamashishini.Kwinkqubo yemibhobho, iinzuzo zayo zokusetyenziswa azifani nezinye iivalve.Okwangoku, kwimveliso kunye nokusetyenziswa kweevalvu zeplastiki zasekhaya, akukho ndlela inokuthenjwa yokuzilawula, okukhokelela kumgangatho ongalinganiyo weevalvu zeplastiki zonikezelo lwamanzi kunye nolunye ulwelo lwamashishini, okukhokelela ekuvaleni okuxekethile kunye nokuvuza okukhulu kwizicelo zobunjineli.Yakha inkcazo yokuba iivalvu zeplastiki azikwazi ukusetyenziswa, ezichaphazela uphuhliso olupheleleyo lwezicelo zemibhobho yeplastiki.Imigangatho yelizwe lam yesizwe yeevalvu zeplastiki ikwinkqubo yokuqulunqwa, kwaye imigangatho yemveliso kunye nemigangatho yendlela iqulunqwe ngokuhambelana nemigangatho yamazwe ngamazwe.

Kumazwe ngamazwe, iintlobo zeevalvu zeplastiki ikakhulu ziquka iivalve zebhola, iivalve zebhabhathane, iivalve zokujonga, iivalve zediaphragm kunye neglobhu.Iifom zesakhiwo eziphambili zineendlela ezimbini, ezintathu kunye neendlela ezininzi.Iimathiriyeli ekrwada ikakhulu yi-ABS,I-PVC-U, PVC-C, PB, PE,PPkunye nePVDF njl.

Kwimigangatho yamazwe ngamazwe yeemveliso zevalvu zeplastiki, imfuno yokuqala yimathiriyeli ekrwada esetyenziselwa ukuveliswa kweevalvu.Umenzi wezinto eziluhlaza kufuneka abe negophe lokungaphumeleli kwe-creep elihlangabezana nemigangatho yeemveliso zemibhobho yeplastiki.Kwangaxeshanye, uvavanyo lokutywinwa, uvavanyo lomzimba wevalvu, kunye novavanyo lwexesha elide lokusebenza, uvavanyo lwamandla okukhathala kunye ne-torque yokusebenza yevalvu zonke zichaziwe, kunye nobomi boyilo lwenkonzo yevalve yeplastiki esetyenziselwa ukuthutha ishishini. Ulwelo lunikwa iminyaka engama-25.

Iimfuno eziphambili zobugcisa zemigangatho yamazwe ngamazwe

1 Iimfuno zemathiriyeli ekrwada

Isixhobo somzimba wevalve, ibhonethi kunye nebhonethi kufuneka zikhethwe ngokuhambelana ne-ISO 15493:2003 “Iinkqubo zemibhobho yeplastiki yamashishini-ABS,I-PVC-Ukunye ne-PVC-C-Pipe kunye ne-fitting system specifications-Icandelo 1: Uchungechunge lweMetric" kunye ne-ISO 15494: 2003 "IiNkqubo zePlastiki zePlastiki ye-Industrial-PB, PE, kunye ne-PP-IiPipe kunye ne-Fitting System Specifications-Icandelo 1: I-Metric Series."

2 Iimfuno zoyilo

a) Ukuba ivelufa inecala elinye kuphela elinoxinzelelo, kufuneka iphawulwe ngotolo olungaphandle kwesivalo.Ivalve ene-symmetrical design kufuneka ilungele ukuhamba kwamanzi ngeendlela ezimbini kunye nokwahlukaniswa.

b) Indawo yokutywina iqhutywa sisikhondo sevalve ukuvula nokuvala ivalve.Kufuneka ibekwe ekupheleni okanye nayiphi na indawo embindini nge-friction okanye i-actuators, kwaye uxinzelelo lwe-fluid alukwazi ukutshintsha indawo yalo.

c) Ngokutsho kwe-EN736-3, ubuncinci bomngxuma wevalvuvu kufuneka buhlangabezane nezi ngongoma zimbini zilandelayo:

- Kuyo nayiphi na i-aperture apho i-medium ijikeleza kwi-valve, akufanele ibe ngaphantsi kwe-90% yexabiso le-DN ye-valve;

— Kwivalvu enolwakhiwo olufuna ukunciphisa idiameter yendlela equkuqela ngayo, umenzi uya kuchaza eyona valve incinane ngomngxuma.

d) Isitywina phakathi kwesikhondo sevalve kunye nomzimba wevalvu kufuneka ihambelane ne-EN736-3.

e) Ngokokunganyangeki kwevalve, uyilo lwevalvu kufuneka luthathele ingqalelo ubomi benkonzo yeendawo ezigugileyo, okanye umenzi kufuneka abonise kwimiyalelo yokusebenza isindululo sokutshintsha ivalve yonke.

f) Isantya sokuhamba esisebenzayo kuzo zonke izixhobo zokusebenza kwevalvu kufuneka sifikelele kwi-3m/s.

g) Kubonwa ukusuka phezulu kwevalve, umqheba okanye ivili lesandla levalve kufuneka livale ivalve ngendlela yewotshi.

3 Iimfuno zokuvelisa

a) Iipropati zemathiriyeli ekrwada ethengiweyo kufuneka ihambelane nemiyalelo yomenzi kwaye ihlangabezane neemfuno zomgangatho wemveliso.

b) Umzimba wevalvu kufuneka uphawulwe ngekhowudi yempahla ekrwada, idiameter DN, kunye noxinzelelo lwegama PN.

c) Ibhodi yesivalo kufuneka iphawulwe ngegama lomenzi okanye uphawu lokuthengisa.

d) Ibhodi yesivalo kufuneka iphawulwe ngomhla wokuvelisa okanye ikhowudi.

e) Ibhodi yesivalo kufuneka iphawulwe ngeekhowudi zeendawo ezahlukeneyo zokuvelisa zomenzi.

4 Iimfuno zokusebenza zexesha elifutshane

Ukusebenza kwexesha elifutshane yinto yokuhlolwa kwefektri kumgangatho wemveliso.Isetyenziswa ikakhulu kuvavanyo lokutywinwa kwesitulo sevalvu kunye novavanyo lokutywina lomzimba wevalvu.Isetyenziselwa ukujonga ukusebenza kokutywinwa kwevalve yeplastiki.Kuyimfuneko ukuba ivalve yeplastiki mayingabikho ukuvuza kwangaphakathi (i-valve seat leakage)., Akufuneki kubekho ukuvuza kwangaphandle (ukuvuza komzimba we-valve).

Uvavanyo lokutywinwa kwesitulo sevalve kukuqinisekisa ukusebenza kwenkqubo yemibhobho yokwahlulwa kwevalve;Uvavanyo lokutywina lomzimba wevalve kukuqinisekisa ukuvuza kwevalve yesikhondo sotywino kunye nesitywina sesiphelo soqhagamshelo ngasinye sevalve.

Iindlela zokudibanisa i-valve yeplastiki kwisistim sombhobho zi

Uxhulumaniso lwe-butt welding: i-diameter yangaphandle ye-valve yokudibanisa inxalenye ilingana nobubanzi obungaphandle bombhobho, kunye nobuso besiphelo sendawo yokudibanisa ivalve ichasene nobuso besiphelo sombhobho we-welding;

Uxhulumaniso lwe-socket bonding: inxalenye yokudibanisa i-valve ikwimo yesokhethi, edibeneyo kumbhobho;

Uqhagamshelo lwesokhethi ye-Electrofusion: inxalenye yokudibanisa i-valve ikwimo yesokethi enecingo lokufudumeza lombane elibekwe kwi-diameter yangaphakathi, kwaye luqhagamshelo lwe-electrofusion kunye nombhobho;

I-Socket hot-melt uxhumano: inxalenye yokudibanisa i-valve ikwimo yesokhethi, kwaye idibaniswe nombhobho nge-socket-melt socket;

Uxhulumaniso lwe-socket bonding: Inxalenye yokudibanisa i-valve ikwimo yesokhethi, edibeneyo kwaye ifakwe ngombhobho;

Ikhonkco lokutywinwa kwe-rubber ye-socket: Ingxenye yokudibanisa i-valve luhlobo lwe-socket kunye nendandatho yokutywina yerubha yangaphakathi, efakwe kwaye idibaniswe nombhobho;

Uxhumo lwe-Flange: Inxalenye yokudibanisa i-valve ikwimo ye-flange, edibaniswa ne-flange kumbhobho;

Uxhulumaniso lwentambo: inxalenye yokudibanisa i-valve ikwimo yentambo, edibaniswa nentambo kumbhobho okanye ukulungelelanisa;

Uqhagamshelo oluphilayo: Inxalenye yoqhagamshelo lwevalvu ikwimo yoqhagamshelo oluphilayo, oludityaniswe nemibhobho okanye izifakelo.

Ivalve ingaba neendlela ezahlukeneyo zokudibanisa ngexesha elinye.

Ubudlelwane phakathi koxinzelelo lokusebenza kunye nobushushu

Njengoko ubushushu bokusetyenziswa bunyuka, ubomi benkonzo yeevalvu zeplastiki buya kufinyezwa.Ukuze kugcinwe ubomi benkonzo efanayo, kuyimfuneko ukunciphisa uxinzelelo lokusetyenziswa.