valvụ bụ ihe na-achịkwa n'ime usoro nnyefe mmiri, na-arụ ọrụ nke ịkpụpụ, nhazi, ntụgharị, na-egbochi nkwụsị, nkwụsị nrụgide, ntụgharị ma ọ bụ nkwụsị nrụgide.
A na-eji Valvalve na sistemụ njikwa mmiri, site na valvụ nkwụsị kachasị mfe ruo na sistemụ njikwa akpaka dị mgbagwoju anya, ụdị ya na nkọwapụta ya dị iche iche.Enwere ike iji valvụ chịkwaa ụdị mmiri dị iche iche dị ka ikuku, mmiri, uzuoku, mgbasa ozi na-emebi emebi dị iche iche, apịtị, mmanụ, igwe mmiri na mgbasa ozi redioaktivu.Dị ka ihe onwunwe si kwuo, a na-ekewakwa valvụ ahụ na nkedo ígwè nkedo, nkedo ígwè valves, igwe anaghị agba nchara (201,304,316, wdg), chromium molybdenum ígwè valves, chromium molybdenum vanadium ígwè valves, abụọ-phase ígwè valves, plastic valves, non - ọkọlọtọ ahaziri valvụ, wdg.