Ntn Corporation

Yoshimi Nishihara

Kenji Ito

Katsutoshi Muramatsu

Hiroyuki Inoue

Kouichi Kiyohara

Toshiaki Kaneko

Makoto Ishihara

A ceramics material for a sliding member used in the water or brought into contact with water is proposed. It is low in frictional resistance and high in wear resistance and shows a long life when used in such a condition. Also, a disk valve assembly is proposed which has a valve body and a valve seat having sliding surfaces that are high in sliding properties. By sliding the valve body on the valve seat having valve holes, the valve holes can be opened and closed. One of the valve seat and the valve body is made of a self-lubricating ceramics material comprising of an oxide ceramic as a main component, and at least one anti-friction agent selected from the group made up of iron, nickel, cobalt and their oxides, nitrides and carbides. The other of the valve seat and the valve body is made of an aluminum oxide ceramics material and has a larger slide contact area than the one of the valve seat and the valve body.

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Kuwana, Japan

Yoshimi Nishihara