A check valve (5) is arranged between a first pressure side (26) and a second pressure side (27) with an external thread (11), which, in a first cylinder section (8) of a cylindrical valve housing (6) of the check valve (5) is applied, in a threaded bore (1) of a housing (2) of a hydraulic assembly to be screwed. In at least one angular segment (α1, α2 and α3) of the valve housing (6) is a passage duct (39) for a hydraulic fluid flow between the side wall of the threaded bore (1) and a first removal (16) of the outer surface (10) of the cylindrical valve housing (6) is formed.
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