VALVE MECHANISM WITH AN ELASTIC MEMBRANE

Air is admitted through ports a and d into the central space in the valve where it applies pressure to membrane 1. Attached to the membrane are pistons 2 and 3 which are subject to the pressure of a fluid. Membrane 1 is in its central position when the pressure of the air is equal on its right and left sides. When the pressure at the left increases, membrane 1 with pistons 2 and 3 moves to the rig…