Butterfly valve related knowledge, Laike valve mo oe e tali
Butterfly valve related knowledge, Laike valve mo oe e tali Butterfly valve o se vaega autu e pulea le suavai, faʻaaogaina lautele i pisinisi eseese, e aofia ai vailaʻau, vailaʻau, meaʻai, vai togafitiga ma isi fanua. O valve butterfly e lauiloa ona...
va'ai fa'amatalaga