Valve
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Ihe nkedo valvụ igwe anaghị agba nchara
valvụ bụ ihe na-achịkwa n'ime usoro nnyefe mmiri nke pipeline.A na-eji ya gbanwee ngalaba ọwa na ntụziaka nke usoro mgbasa ozi.Ọ nwere ọrụ nke ntugharị, nbipụ, throttling, nlele, shunt ma ọ bụ nfefe nrụgide enyemaka.