A valve device, especially for an air cushion of plastic sheet, said device having a first portion which is adapted to be mounted in an aperture in the wall of the cushion, said first portion having a relatively large bore which is adapted to constitute an outlet for emptying the air cushion, a second...http://www.google.co.uk/patents/US3983907?utm_source=gb-gplus-sharePatent US3983907 - Valve device, especially for air cushions
