Kabushiki Kaisha Toshiba

Tetsu Shioiri

Junichi Sato

Iwao Ohshima

Yuki Sekimori

Kunio Yokokura

Naoki Asari

A vacuum valve according to embodiments of the present disclosure comprise a prescribed shaped vacuum insulation vesselhaving openings on its both ends, sealing metal fittingsconfigured to seal the openings of the vacuum insulation vesselrespectively, and a pair of contact pointswhich can be brought into contact or out of contact with each other and is arranged within the vacuum insulation vessel, wherein the vacuum insulation vesselincludes a base material layerof aluminum oxide, a 1st oxidization promotion layerwhose oxygen combination was promoted, which 1st oxidization promotion layeris formed on the inner circumference of the base material layer, and a 2nd oxidization promotion layerwhose oxygen combination was promoted, which 2nd oxidization promotion layeris formed on the outer circumference of the base material layer

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Saitama, Japan

Tetsu Shioiri