Amavalvu okuvala e-SVA ayatholakala ngezinguqulo ze-engeli kanye nezisuka nje kanye ne-Standard neck (SVA-S) ne-Long neck (SVA-L).
Ama-valve okuvala aklanyelwe ukuhlangabezana nazo zonke izidingo zokufaka isiqandisi sezimboni futhi aklanyelwe ukunikeza izici zokugeleza ezivumayo futhi kulula ukuwahlakaza nokukhanda uma kudingeka.
I-valve cone iklanyelwe ukuqinisekisa ukuvala okuphelele nokumelana ne-pulsation yesistimu ephezulu kanye nokudlidliza, okungaba khona ngokuqondile emgqeni wokukhipha.