Siaki le Valve

O le valve siaki ua mamanuina ma gaosia atoa e tusa ai ma manaʻoga o le API 6A "Faʻamatalaga o Meafaigaluega mo le Wellhead ma le Laʻau Kerisimasi", e mafai ona faʻaaogaina faʻatasi ma meafaigaluega faʻaopoopo i totonu ma fafo atu o le atunuʻu e ogatusa ma le API 6A Standard. O le ogatotonu e faʻaaogaina le uʻamea e teteʻe atu i le sulfide ma e mafai ona faʻaaogaina i le tulaga H2S, o le tino o le valve e faia i le uʻamea uʻamea faʻatasi ma le faʻatinoga lelei. E lua ituaiga o Check valve e ofoina atu e le landrill: Swing type ma le Lift type.