Patent ID: 8522935

Claim:
A balancing valve (V) for a braking system of a vehicle having two separate master brake cylinders ( 1 ) configured for independent braking of respective opposite wheels of the vehicle, the two master brake cylinders connected to each other by way of a transfer channel ( 7 ), the balancing valve (V) comprising: a piston configured to operate within one of the master brake cylinders, the piston comprising first and second containment spaces; and first and second ring packings ( 9 , 10 , 11 ) configured to cooperate with an intake ( 8 ) of the transfer channel ( 7 ), the first ring packing ( 11 ) being housed within the first containment space ( 12 , 13 ) of the piston, the first containment space ( 12 , 13 ) defined in cross-section by a top surface, a side surface, and a bottom surface, an expanded portion ( 13 ) of the containment space located where the top surface, side surface, and bottom surface meet, the top surface having a sloped portion that slopes toward the bottom surface as a function of increasing distance from the side surface to form a narrowed portion ( 12 ) of the containment space at a location distanced from the side surface such that a displacement of the first ring packing ( 11 ) from a rest position at the expanded portion ( 13 ), resulting from an operational pressure applied through the transfer channel ( 7 ), causes the first ring packing ( 11 ) to enter the narrowed portion ( 12 ) and increases a volume of a space around the piston that is in fluid communication with an inner space of the transfer channel, the first ring packing ( 11 ) configured to be contained within the expanded portion ( 13 ) under a condition of minimum elastic deformation, and the first ring packing ( 11 ) configured to penetrate into the narrowed portion ( 12 ) under a condition of increasing elastic deformation, the first ring packing ( 11 ) configured to occupy the expanded portion ( 13 ) in the rest position, and configured to be displaced into the narrowed portion ( 12 ) upon application of the operational pressure, the first ring packing ( 11 ) configured to elastically deform as the first ring packing ( 11 ) displaces into the narrowed portion ( 12 ), wherein the first ring packing ( 11 ) is an O-ring, and wherein the second ring packing ( 9 , 10 ) is housed in the second containment space, the second ring packing comprising an O-ring ( 9 ) within the interior of the second containment space and a peripheral ring ( 10 ), configured for sealing and sliding, located at an open end of the second containment space.