Abstract: A volume sensor for liquids comprising a measuring chamber in which toothed meter wheels mesh with one another and are mounted on stationary pivots. Flow paths are formed in at least one of the measuring-chamber end walls and are separated by a web in the pivot plane, the edges of which are substantially symmetrical with the pivot plane. The tooth spaces of the meter wheels, at least on the side facing the flow paths, are formed with a recess which extends radially inwards compared with the root circle and is symmetrical in respect to the tooth space. The web is constructed so that whenever a tooth space of the two meter wheels is in the centre position in the pivot plane, the edges of the web substantially coincide in shape with the neighbouring flanks of the teeth adjacent the tooth space so that the latter is cut off from the flow paths in the end walls. The flow paths allow the liquid pressure to be reduced before the tooth space is closed off.