Importance

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Abstract

An exhaust gas flow control valve assembly comprises a valve casing forming an exhaust gas passage defining a cylindrical inner peripheral surface and a butterfly-type exhaust gas flow control valve disposed within the exhaust gas passage and movable between an open position and a closed position. The flow control valve includes a single-piece valve disc member having a circumferential groove formed in an outer peripheral surface thereof, and a flat, resilient stainless steel sealing ring disposed in the groove with a clearance for radial displacement of the sealing ring relative to the groove. The sealing ring includes a cylindrical outer peripheral surface provided with rounded corners. The outer peripheral surface of the sealing ring is in firm contact with the inner peripheral surface of the valve casing solely by an elastic force of the sealing ring when the exhaust gas flow control valve is in the closed position.

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First Claim