Patent ID: 7814886

Claim:
A shut-off valve ( 21 ) of the flow rate of a fuel pump ( 6 ) for an internal combustion engine ( 2 ); the shut-off valve ( 21 ) comprises: a tubular cylindrical body ( 25 ), which is closed on top, displays a cylindrical seat ( 26 ), the lower portion of which performs the function of fuel pipe, and comprises a number of radial through holes ( 27 ) to allow the introduction of fuel within the cylindrical seat ( 26 ); a lower plate ( 28 ), which is arranged within the tubular cylindrical body ( 25 ) underneath the radial holes ( 27 ) and displays a central through hole which defines an outlet opening ( 24 ) of the fuel; and a cylindrical shutter ( 29 ), which is coupled to the lower plate ( 28 ) and is mobile between an open position, in which the outlet opening ( 24 ) is in communication with the radial holes ( 27 ), and a closed position, in which the outlet opening ( 24 ) is isolated from the radial holes ( 27 ); the shut-off valve ( 21 ) is characterized in that from a lower surface of the cylindrical shutter ( 29 ) arranged facing the closing plate ( 28 ) an inner ring ( 30 ) protrudingly rises, the diameter of which is slightly larger than that of the outlet opening ( 24 ) and defines a sealing element for isolating the outlet opening ( 24 ) of the radial holes ( 27 ) when the shutter ( 29 ) is arranged in the closed position resting against the lower plate ( 28 ).