A concentrate container has a downwardly directed outlet passage provided with an internal valve seat and an outlet downstream thereof. A valve member is accommodated in the outlet passage and consists of a tubular first portion of magnetizable steel within which but with clearance from the inner surface of which a valve seat engaging streamlined second portion is centered and positioned by sharp-edged struts or webs extending across the clearance. An electromagnetic device is so positioned as, when energized, to lift the valve seat engaging second portion out of contact with the valve seat so that concentrate can pass from the outlet under the influence of gravity. Means is provided for admixing water with the thus-dispensed concentrate to produce a beverage or other mixed liquid.