Provided herein is a dispenser head for a beverage cask which has a valve head with a spring-loaded valve disc. The dispenser head includes a housing, a connection element for fastening the housing to the valve head of the beverage cask, a propellant gas inlet, configured on the housing, for connecting a propellant gas line, a ram which is mounted movably in the housing and contains a riser duct and which, by pressing into the valve head, opens the spring-loaded valve disc, a liquid outlet for connecting a beverage line and an actuating mechanism for actuating the ram. The actuating mechanism is configured as a rotational mechanism which has a spiral gearing and a hand wheel connected to the ram and to the spiral gearing.

A container for a fluid under pressure, preferably a beer keg, including a neck and a fitting mounted thereon with a suction tube for drawing the fluid into the container. A pressure relief valve is mounted in an upper end of the suction tube or in the neck of the container. The pressure relief valve includes a closing body which is mounted resiliently via a spring and movable from a closing position to an open position by the spring being compressed.

A valve device (2) is provided for the filling and the emptying of a double-walled container (1) totally made of a plastic material such as PET or similar, wherein said container (1) comprises a first container (10) and a second container (11) made of yieldable plastic material and being inserted inside said first container (10), the valve device (2) comprises a valve body which includes a first tubular member (20) connected to a second tubular member (21), and a third tubular member (22) mounted in an axially movable manner inside said valve body against the action of a spring (23).