Patent ID: 7472886

Claim:
A fluid control valve assembly for controlling the flow of a fluid comprising: a housing that defines a fluid passage; a valve with a ring-shaped groove, the valve provided in the fluid passage, wherein the valve has an open position for allowing the fluid to flow in the fluid passage, and wherein the valve has a closed position for reducing the flow of the fluid in the fluid passage; a seal ring with a cutout clearance extending between an outer diameter and an inner diameter of the seal ring, wherein the seal ring includes a pair of opposing axial side surfaces, wherein the seal ring is provided in the groove, and wherein the seal ring seals against the housing when the valve is in the closed position to thereby reduce flow of the fluid through the housing; and a backup ring provided in the groove adjacent one of the axial side surfaces of the seal ring to thereby obstruct fluid flow through the clearance of the seal ring when the valve is in the closed position, wherein: the backup ring is one of: a slitted backup ring that includes a slit, which extends between an outer diameter and an inner diameter of the backup ring and has a size smaller than that of the cutout clearance of the seal ring in a circumferential direction; and a slitless backup ring that extends continuously all around the groove in the circumferential direction; the seal ring and the backup ring protrude radially outwardly from the valve; and an outer diameter of the backup ring is less than that of the seal ring.