valvụ bụ mgbakwunye pipeline nke a na-eji meghee ma mechie pipeline, na-achịkwa ụzọ mgbaba, na-achịkwa ma jikwaa paramita (okpomọkụ, nrụgide na ọnụego eruba) nke usoro ebufere. Dị ka ọrụ ya si dị, enwere ike kewaa ya na valvụ mechiri emechi, valvụ nlele, valves na-achịkwa, wdg ....
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