GAS SHUTTLE VALVE PROVIDED WITH AN ANTI-CORROSIVE LAYER

摘要

The invention relates to a gas shuttle valve for an internal combustion engine comprising a valve cone which substantially consists of a valve shaft projected in a valve disc in such a way that a hollow cone is formed. The valve cone or at least the shaft thereof is made of a typical valve steel consisting of a nitride forming base alloy up to the hollow cone area. The aim of said invention is to improve said gas shuttle valve in such a way that even the parts made of the typical valve steel exhibit a good anti-corrosive protection. For this purpose, the valve cone is provided at least partial area with an anti-corrosive layer in the form of a nitride layer, which is produced by the nitride forming base alloy conversion by plasma nitriding or plasma nitrocarburising in a nitrogenous atmosphere.