ʻO kaʻO ka wafer pāpaʻi pālua ʻelua'Oi aku ka ikaika, 'oi aku ka māmā o ke kaumaha a me ka li'ili'i o ka nui i ho'ohālikelike 'ia me ka valve check swing ma'amau a i 'ole life check valve.it.hoʻohana i ʻelua ʻāpana i hoʻopiha ʻia i ka puna i hoʻopaʻa ʻia ma kahi pine hinge waena.I ka emi ana o ke kahe, pili na papa i ka torsion spring action me ke koi ole i ka hoohuli.ʻO nā hiʻohiʻona āpau i hui pū ʻia e hana i ka Dual Plate Check Valve kekahi o ka hoʻolālā maikaʻi loa.

aia iā mākouʻO ka wafer pāpaʻi pālua ʻeluame ka hana hoʻopaʻa hoʻopaʻa nani, akā no ka haʻahaʻa haʻahaʻa a me ka mahana maʻamau, no ka palena o nā hiʻohiʻona rubbers.