Check valve for a pressure fluid circuit in a combustion engine

Claim 2

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).

Claim 3

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 kind 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 the seat (4) and a second opposite open end (7) which supports 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 the duct (C) and retaining said cylindrical body in mounting and fluid-tight abutment position within the duct through co-operation of two shoulders (9, 22), characterized in that towards the first open end (6) of the body (1), the seat (4) consists of a separate part (4a) maintained in an annular groove (18) formed by a portion (19) of the end (6) turned towards the inside of the body (1) and by a shoulder (20) arranged in the inner periphery (17) of said body, whereas the second open end (7) of the body (1) is provided with an annular groove (14) formed by one portion (15) of the end (7) turned towards the inside of the body (1) and by a shoulder (16) arranged in the inner periphery (17) of this body, said annular groove retaining the flange (5a) of a tubular element (5) for bearing and centering the spring (3) and said body (1) comprising on its outer periphery (8) an annular groove (10) in which is received a sealing joint (11).

Claim 4

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 kind 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 the seat (4) and a second opposite open end (7) which supports 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 the duct (C) and retaining said cylindrical body in mounting and fluid-tight abutment position within the duct through co-operation of two shoulders (9, 22), characterized in that towards the first open end (6) of the body (1), the seat (4) consists of a separate part (4a) maintained in an annular groove (18) formed by a portion (19) of the end (6) turned towards the inside of the body (1) and by a shoulder (20) arranged in the inner periphery (17) of said body, whereas the second open end (7) of the body (1) is provided with an annular groove (14) formed by one portion (15) of the end (7) turned towards the inside of the body (1) and by a shoulder (16) arranged in the inner periphery (17) of this body, said annular groove retaining the flange (5a) of a tubular element (5) for bearing and centering the spring (3) and said body (1) comprising on its outer periphery (8) an annular groove (10) in which is received a sealing joint (11).