IsiKhokelo sokuKhetha uMfuziselo weValve yePlasitiki (1)

Iivalvu zebhola zeplastiki, njengamacandelo olawulo olubalulekileyo kwiinkqubo zemibhobho, zisetyenziswa ngokubanzi kwiinkalo ezahlukeneyo ezifana nokunyangwa kwamanzi, ubunjineli beekhemikhali, ukutya kunye namayeza. Ukhetho oluchanekileyo lwemodeli lufuna ukuqwalaselwa kwezinto ezahlukeneyo ezifana nemathiriyeli, indlela yoqhagamshelo, umlinganiselo woxinzelelo, udidi lobushushu, njl.njl. Esi sikhokelo sizakwazisa ngokucwangcisekileyo amanqaku aphambili okukhetha.iivalvu zebhola zeplastiki, kukunceda wenze ukhetho olusengqiqweni.

Ukuhlelwa okusisiseko kunye nemigangatho yeevalvu zebhola zeplastiki
1. Iindlela zokuhlela eziphambili
Iivalvu zebhola zeplastiki zinokuhlelwa ngokwemigangatho eyahlukeneyo:

(a) Ngendlela yoqhagamshelwano:
Flangeivalve yebhola yeplastiki: ilungele iinkqubo zemibhobho yobubanzi obukhulu
Ivalve yebhola yeplastiki enemisonto: edla ngokusetyenziswa kwimibhobho yobubanzi obuncinci
Ivalve yebhola yeplastiki yesokhethi: kulula ukuyifaka ngokukhawuleza
Ivalve yebhola yeplastiki eqhutywa kabini: kulula ukuyiqhaqha kunye nokugcina

(b) Ngendlela yokuqhuba:
Ivalve yebhola yeManual: inoqoqosho kwaye iyasebenza
Ivalve yebhola yomoya: ulawulo oluzenzekelayo
Ivalve yebhola yombane: ukulungiswa okuchanekileyo

(c) Ngemathiriyeli:
Ivalve yebhola ye-UPVC: ilungele unyango lwamanzi
Ivalve yebhola yePP: Ukutya kunye noshishino lwamayeza
Ivalve yebhola ye-PVDF: Indawo eyomeleleyo edlayo
Ivalve yebhola yeCPVC: Indawo yobushushu obuphezulu

2. Imigangatho yesizwe kunye neenkcukacha
Imigangatho ephambili yeiivalvu zebhola zeplastikieTshayina zezi zilandelayo:

I-GB/T 18742.2-2002: Iivalve zebhola zeplastiki ezifanelekileyo kwi-DN15~DN400, uxinzelelo olulinganisiweyo lwe-PN1.6 ~ PN16
I-GB/T 37842-2019 "Ii-Valves zeBhola ze-Thermoplastic": Ifanelekile kwiivalve zebhola ze-thermoplastic ukusuka kwi-DN8 ukuya kwi-DN150 kunye ne-PN0.6 ukuya kwi-PN2.5

3. Ukukhethwa kwezinto zokutywina
Irabha ye-EPDM ternary ethylene propylene: i-asidi kunye ne-alkali ukumelana, uluhlu lobushushu -10 ℃~+60 ℃
I-FKM fluororubber: i-solvent resistant, uluhlu lobushushu -20 ℃~+95 ℃
I-PTFE i-polytetrafluoroethylene: ixhathisa kwi-corrosion eyomeleleyo, uluhlu lobushushu -40 ℃ ukuya+140 ℃