A double valve (1) is used for a container (4) of the type serving the purpose of distribution of a liquid, e.g. beer, which is stored in the container (4) under pressure of a gas, e.g. CO2. The valve (1) comprises a liquid passage (5); a gas passage (6); an elastomer valve ring (7) placed in the gas passage and being axially displaceable for closing the gas passage (6); an opening (10) formed in the valve ring (7) which opening forms the mouth of the liquid passage (5); a valve plug (11) placed in the liquid passage (5) and being axially displaceable serving the purpose of closing this mouth. In the valve ring (7) a reinforcement ring (19) has been inserted with an inside turning collar (21) having a number of incisions (23). At these incisions (23) there will be created weaker areas in the valve ring (7) which areas will be broken in such a way that there will be a free passage for the flow of the gas out to the open when the pressure in the container (4) by intensively heating of the gas during for instance a fire exceeds the acceptable limit for the container (4). In that case the double valve will work as an efficiently operating security valve.
