(EN)
A beer keg valve assembly includes a port having a head portion having a
convex
upper surface and at least one leg extending downwardly from a lower surface.
The leg
includes a stop surface projecting radially outward further than the head
portion. A piston
defines an opening. A spring biases the port against a periphery of the
opening defined by the
piston to seal the convex upper surface of the head portion over the opening.