A membrane which serves as the movable valve member of a valve such as a distribution and apportionment valve of a fuel injection system for internal combustion engines, the membrane having at least one area intended for clamping purposes, at least one area of elasticity, and at least one control area, whereby the control area has a greater thickness than does the elastic area. The clamping area of the membrane may be provided with a photographic lacquer layer (negative lacquer) which serves as a sealing means and as protection against corrosion between the membrane and the valve housing. The invention further includes a method for fabricating the membrane onto which an adherent metallic layer is applied either by galvanic means or in a chemical bath.