Oseihe nwokeAkara mmanụ mmanụvalvụ na-ese n'eluSitef-80bụ bọọlụ na-ese n'elu mmiri, a na-ejikọ mmiri na-ebugharị na ngbanwe a na-ahụ maka agịga, wdg. Mmanụ a na-eweta mmanụ ọkụ na-abanye n'ime ụlọ nke piston na-abanye n'ọnụ ụlọ dị elu site na obere oghere abụọ. Onwere obere oghere dị n'etiti piston jikọrọ ya na mmanụ mmanụ ma na-achịkwa ya.
Mgbe mmiri mmiri dị na tank mmanụ dị larịị, a na-ebugharị bọl nke na-ese n'elu mmiri site na otu onye na-ese mmiri, na-eme ka otu ọnya nke agịga ahụ pịa obere oghere n'etiti pọm. Isi iyi nrụgide nke mmanụ na-abanye n'ọnụ ụlọ dị elu nke pish iji mepụta nrụgide. Dị ka elu nke pish na-ebu ibu karịa mpaghara aka dị ala, piston na-arụ ọrụ ala na mkpọchi na-emegide elu elu. Oseihe nwokeAchịcha mmanụ mmanụ mmanụSitef-80nọ na steeti mechiri emechi.
Mgbe ọkwa mmanụ dị na ite mmiri nke bọọlụ na-ese n'elu mmiri na-ebelata, mkpọchi agịga na-aga n'aka nri mgbe ike dị elu karịa ike Buyal. Mkpịsị aka na-acha uhie uhie na-emepe etiti oghere nke pish, na mmanụ nrụgide dị na elu ụlọ dị n'elu mma nke pish na-achụfuba n'ime ụgbọ mmiri. Mmanụ nrụgide dị n'etiti ụlọ ndị Piston ahụ na-akpali piston na aka nri ma mepee vaning ka mmanụ mmanụ.
Mgbe ọkwa mmanụ na-erute otu ọnọdụ, Buyancy nke bọọlụ na-ese n'elu na-abawanye, na-eme ka ahụvagvụ agịgaCone iji jide oghere oghere, yana poston elu-ejikọtara na isi iyi egwu. A na-emechi valvụ na mmiri na-agwụ agwụ. A na-eji nwayọọ nwayọọ na-eme ka mmiri jupụta na mgbanwe na ọkwa mmiri. N'ezie, plọg agị na piston na-agagharị. Iwu ọrụ bụ otu ihe ahụ dị ka valvụ mmanụ, nke na-achịkwa ọkwa mmanụ mmanụ.