Method of manufacturing a valve housing

A method of manufacturing a metallic valve housing by hydroforming a tube section in a die including an upper part having a stamp and a lower part having a depression, the method comprising the following steps:

• placing the tube section in the die;
• filling the tube section with a liquid to subject the tube section to a high internal pressure;
• and
• shaping opposite walls of the tube section in a middle portion of the tube section between two tube ends of the tube section by
• pressing one side of the tube section inwards transversely to a center axis of the tube section with the stamp to form a concave curvature serving as a threshold and valve seat between a fluid input and a fluid output of a valve formed by the tube ends, and
• pressing the opposite wall into the depression in the lower part to form a flat.