| 摘要 |
PROBLEM TO BE SOLVED: To provide a pressure drop display device which allows easy adjustment of working pressure and operation with a high degree of reliability. SOLUTION: The pressure drop display device comprises a bellows 2 which is attached to a vessel 1 and expands and contracts with fluctuations in gas pressure in the vessel 1 and displays a gas pressure drop in the vessel 1 by rotating an indication plate 12 through the expansion and contraction of the bellows 2. The device comprises an actuation shaft 9 which advances and retreats in an axial direction with the expansion and contraction of the bellows 2, a support shaft 11 orthogonal to the actuation shaft 9, the indication plate 12 rotatably supported by the support shaft 11, and a spring 13 which urges the indication plate 12 to rotate about the support shaft 11. The tip of the actuation shaft 9 is provided with a hook 14. When the pressure in the vessel 1 is in normal condition, the hook 14 is engaged with the indication plate 12 to restrict the rotation of the indication plate 12. When the pressure in the vessel 1 drops, the bellows 2 expands, and the actuation shaft 9 retreats to release the engagement of the hook 14 with the indication plate 12, allowing the indication plate 12 to rotate by the force of the spring 13. COPYRIGHT: (C)2005,JPO&NCIPI
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