| 摘要 |
PROBLEM TO BE SOLVED: To provide an inspection window for seeing a liquid level and the like of a pressure fluid vessel using a transparent protection plate which prevents a damage of a glass body, has resistance against liquid, vapor, or the like especially at high temperature and high pressure, has erosion resistance and corrosion resistance compared to a conventional mica plate, is hardly separated, and is hardly contaminated because silica is hardly adhered. SOLUTION: The inspection window of the pressure fluid vessel has a transparent protection plate made of alumina single crystal between a port portion and the body inner direction of the inspection window of the pressure fluid vessel for seeing the liquid level of the pressure fluid vessel through the glass body. COPYRIGHT: (C)2010,JPO&INPIT
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