Abstract: A valve device is provided for being mounted in the neck opening of a receptacle containing a substance to be dispensed. The device includes a valve body (1) having therein a chamber (2) defined axially at one end by an annular valve gasket (3) including a central opening, and a valve plunger (10) passing through the gasket (3) and including a dispensing channel (12) opening out in its outside surface via a radial hole (13). The valve plunger (10) is molded out of a material which includes a mixture of acetal resin, polytetrafluoroethylene (PTFE), and silicone, so that the valve plunger (10) slides with low friction over the valve gasket (3).