Amavalvu okuhlola, amavalvu angabuyisi, aklanyelwe ukuvimbela ukubuyela emuva kokugeleza ohlelweni lwamapayipi. Lawa mavalvu asebenza ngezinto ezigelezayo epayipini.Ukucindezela koketshezi oludlula ohlelweni kuvula ivalvu, kuyilapho noma yikuphi ukuguquka kokugeleza kuzoyivala ivalvu.Ukuvalwa kufezwa ngesisindo sendlela yokuhlola, ngokucindezela emuva, ngesipilingi, noma ngokuhlanganiswa kwalezi zindlela.

I-Valve Yokuhlola Insimbi Ehlanganisiwe  ingeye-valve yokuhlola umfutho ophezulu encane, eyenziwe ngensimbi eyenziwe ngobumba. Sivame ukuyenza nge-swing check valve, i-piston check valve (i-lift check valve).Itholakala ngemiklamo emithathu yebhonethi. Umklamo wokuqala yiBolted Bonnet, enejoyinti yowesilisa nowesifazane, i-spiral wound gasket, eyenziwe nge-F316L/graphite. I-ring joint gasket nayo iyatholakala uma iceliwe. Umklamo wesibili yibhonethi ehlanganisiwe, enejoyinti ehlanganisiwe enentambo kanye ne-seal. Uma iceliwe, ijoyinti ehlanganisiwe enamandla okungena aphelele iyatholakala, umklamo wokugcina yibhonethi yokuvala ingcindezi, okuwumklamo wamavalvu okucindezela okuphezulu.