Amavalvu kanxantathu ayadingeka ezindlini zangasese, kompompi bamanzi, ompompi besitsha semifino, izifudumezi zamanzi, amapayipi amanzi, njll. Umzimba wevalvu we-engeli unezimbobo ezintathu: indawo yokungena amanzi, imbobo yokulawula umthamo wamanzi, nendawo yokuphuma amanzi, ukuze ibizwa ngokuthi i-valve engunxantathu.Yiqiniso, ama-engeli amanje ama-valve...
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