Ku bijyanye n'imikorere yoroshye yo gukata, inshingano yo gufunga ya valve mu mashini ni ukurinda ko icyuma kivamo amazi cyangwa ngo kibuze ibintu byo hanze kwinjira imbere ku ruhande ruri hagati y'ibice biri mu mwobo aho valve iherereye. Ijosi n'ibice bigira uruhare mu gufunga byitwa seal cyangwa sealing structures, byitwa seal mu magambo ahinnye. Ubuso buhura n'ibice bigira uruhare mu gufunga byitwa seal surfaces.

Ubuso bwo gufunga bwa valve ni igice cy'ingenzi cya valve, kandi imiterere yayo yo gusohoka ishobora kugabanywamo muri ubu bwoko, ari bwo, gusohoka kw'ubuso bwo gufunga, gusohoka kw'impeta yo gufunga, gusohoka kw'igice cyo gufunga no gusohoka kw'ibintu by'amahanga biri hagati y'ubuso bwo gufunga. Imwe mu mvange zikoreshwa cyane mu miyoboro n'ibikoresho ni ukugabanya urujya n'uruza rw'amazi. Kubwibyo, gukomera kwayo ni cyo kintu cy'ingenzi kigena niba gusohoka kw'imbere bibaho. Ubuso bwo gufunga valve muri rusange bugizwe n'imirongo ibiri yo gufunga, imwe iri ku mubiri wa valve indi iri kuri disiki ya valve.