Diaphragm for hydraulically controlled or actuated pumps

摘要

The invention relates to a diaphragm for hydraulically controlled or actuated pumps having a simple diaphragm or two diaphragms between which there is a liquid. The diaphragm consists of a slightly convex centred calotte (20) which has an outer annular bead (21) and a variable cross-section whose thickness (e) changes uniformly from the centre of the calotte towards its edge. The diaphragm according to the invention can be used, in particular, for dosing pumps. <IMAGE>