Check valve for a pressure fluid circuit in a combustion engine.

摘要

1. Non-return valve in particular for a circuit of pressure liquid such as oil and mounted in a portion of an internal combustion engine and of the type comprising said integrally-made non-return valve insertable into a duct (C) of said portion and comprising a hollow cylindrical body (1) enclosing a movable member (2) such as a ball permanently urged by a spring (3) against a seat (4), said hollow body comprising a first open end (6) including said seat (4) and a second opposite open end (7) supporting the spring (3), one of the two open ends of the cylindrical body (1) forming a bearing face for a screw (23) screwed into said portion of the engine comprising said duct (C) and retaining said cylindrical body in mounted and fluid-tight abutting position within said duct through co-operation of two shoulders (9, 22), characterized in that on the second end (7) of the cylindrical body (1) is fitted a tubular element (5) for bearing and centering the spring (3) and which is secured by welding or adhesive bonding onto this second end while leaving between the latter and a shoulder (12) of the tubular element (5) a groove-like annular space (10) which contains an O-ring seal (11) providing for the fluid-tightness between the body (1) and the duct (C).