A metering valve (1) having a contiguous double wall structure including an inner wall defining the metering chamber (5) and an outer wall which defines a crimping and support wall against which the inner rim of the mounting cup of the container can be crimped. The outer wall may be maintained at the same diameter and thickness for use with generally any mounting cup which are approximately an inch in diameter as well as any mounting process and machinery. The inner wall may however be sized differently in order to accommodate different dosages for metering of product. A radial space between the inner and outer wall permits both the axial elongation of the metering chamber (5) as well as a radial expansion of the inner wall and hence the valve chamber (5) relative to the outer wall due to the space between the inner and outer wall.
