Patent ID: 8485361

Claim:
A container, comprising: a cylindrical wall; a convex bottom; a convex top; and a connecting unit located on the convex top; wherein the connecting unit comprises: a multiway valve system having a valve (a), a valve (b) and a valve (c), the valve (a) which at least communicates with a first external connection device, an immersion tube which extends to a lowest point of the convex bottom in an interior of the container and the valve (b), the valve (b) is intermediate between and communicates only with valves (a) and (c), and the valve (c) at least communicates with a second external connection device, the valve (b) and the interior of the container at the convex top, and further wherein the container is pressure resistant being capable of pressurization and evacuation, and an internal volume of the container is from 300 to 20,000 liters.