O le valve faitotoa naifi e masani ona faʻaaogaina i tulaga maualalo e pei o le pulupulu ma le pepa, koale, vailaʻau vailaʻau ma meaʻai.E mafai e le NSEN ona tu'uina atu le tasi-directional, bi-directional, u'amea nofo, nofoa maufetu ma le ala ala.Faʻafeiloaʻi e faʻafesoʻotaʻi matou e maua le ofo pe faʻapipiʻi valve mo lau poloketi.