Patent ID: 7581560

Claim:
A check valve, comprising: a housing of integral construction including a wall at a first end defining an inlet opening, a bottom end at a second end opposite to said first end defining an outlet opening and a housing seat disposed adjacent to the inlet opening; a spring element and a closing body; a cage insert being disposed within the housing and extending substantially between the wall defining said inlet opening and the bottom end defining said outlet opening, said cage insert supporting the spring element and guiding the closing body; the closing body including a flat outer surface contactable with the housing seat, said closing body being moveable against the spring element between a first end position, in which the closing body contacts the housing seat to form a seal, and a second end position in which the valve is completely open; and the closing body being formed pot-shaped including a cylindrical section presenting a cylindrical casing surface, said closing body being guided with the cylindrical casing surface within the cage insert, said cage insert including at least one opening in a side thereof facing said cylindrical casing surface.