I-valve yeplastiki luhlobo olusetyenziswa ngokubanzi lwevalve, ineenzuzo zokuxhathisa i-corrosion, ubunzima bokukhanya, ukumelana nokugqoka, njl. Isetyenziswe ngokubanzi kwiikhemikhali, i-petrochemical, ukukhuselwa kwendalo kunye namanye amashishini.Oku kulandelayo yimbali yophuhliso lweevalvu zeplastiki.Ngeminyaka yee-1950, w...
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