Shut-off valve has pivoting valve flap with longitudinally curved sealing surfaces which are concave with respect to contact surfaces on walls of conduit and which are elastically deformed when flap is in closed position

摘要

The shut-off valve has a pivoting valve flap (1). This has longitudinally curved sealing surfaces (6) which are concave with respect to contact surfaces (4) on the walls of a conduit (3). These surfaces are elastically deformed when the flap is in the closed position and provide better sealing.