Abstract: This invention relates to a valve mechanism for draining a liquid from a vessel by means of pressurized gas introduced into the vessel, said mechanism comprising a connecting member mounted on the vessel, having a hollow rising pipe extending to near the bottom of the vessel and being open at the lower end and a closing member located near the top side and urged by a spring mechanism into a closed state and a connecting piece adapted to be coupled with the connecting member and having a gland with the aid of which the closing member can be opened against the action of the spring mechanism for passing pressurized gas through the connecting piece and the connecting member to the vessel and for passing liquid from the vessel through the connecting piece, for which purpose the connecting piece is provided with a gas supply duct and a liquid outlet duct.

Abstract: A valve mechanism for draining liquid from a container with a pressurized gas. A pipe extends into the container to permit flow of liquid to an outlet. A nut mounts other components of the valve mechanism into the container when the nut is secured in the container opening.A socket releasably connects the pipe and nut whenever the nut is not secured to the container. This allows the pipe, socket and nut to be manufactured separately and also permits replacement of a worn component without having to replace the entire valve mechanism.