A valve has a flexible sheet member which moves toward and away from a flat, non-flexing sheet member to cover and open two holes in the nonflexing sheet member to block or permit fluid flow between passageways in a second valve body portion member. The flexible sheet member is extendible into a recess...http://www.google.fr/patents/US5660370?utm_source=gb-gplus-shareBrevet US5660370 - Valve with flexible sheet member and two port non-flexing backer member
Valve with flexible sheet member and two port non-flexing backer member
