To provide a vacuum gauge which enables grasp of accurate vacuum achievement, and sufficient control of the degree of vacuum, even if rough handling is performed in work, when an air conditioning machine is installed.
The inside of a cylinder vessel is divided into two chambers with a partition plate. In one chamber of the cylinder vessel, a coil spring is arranged, and a continuous hole is formed in its bottom. In the other chamber, a movable shaft to be a pressure indicating element is united to the partition plate, and the movable shaft is arranged from the inside of the cylinder to the outside through a through hole. This vacuum gauge enables grasping of a degree of vacuum formed when the pressure on the continuous hole side becomes negative, by interlocking the movable shaft with the movement of the partition plate, and compression variation of the coil spring by pressure indicating graduations formed on the movable shaft.
Tomoyasu Sakaguchi
Hiroki Naito
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