Denso Corporation

Kouichi Nagaya

Naoki Kato

Youichi Murakami

Hiroyasu Kanamori

A valve body of a spill valve is constructed of steel having a martensitic structure and a needle constructed of steel in which hard particles are dispersed in a matrix having a martensitic structure. A hardness difference between the matrix and the hard particles is equal to or smaller than 1000. By reducing the difference in hardness between the matrix and the hard particles of the needle, projections and detachment of hard particles are prevented. Accordingly, the wear of the matrix and valve body resulting from exposed hard particle is precluded while ensuring hardness of the valve.

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Nagoya, Japan

Kouichi Nagaya