Abstract: A self-closing and self-sealing valve device for use with inflatable structures. The valve device comprises a pair of relatively flat plastic sheets which are disposed over one another in facewise engagement, and form an air inlet end and air outlet end, the latter of which is disposed in the inflatable structure. The valve is constructed by providing two longitudinal heat seals in proximity to the longitudinal margins of the pair of plastic sheets or strips. An adhesive zone is formed interiorly of the two longitudinal heat seals and causes a self-closing and self-sealing of the valve device. The adhesive zone further precludes any sealing of the two sheets in the adhesive zone during longitudinal sealing operations since sealing will not occur with the presence of the adhesive. In this way, since the two sheets are adhesively secured to one another, there is no back flow from the inflatable and deflatable structure outwardly of the structure even under low pressure condition.