| 摘要 |
PURPOSE:To feed gas to each gas holder in sequence and generate with a reduced protective space by changing the gas pressure for each gas holder. CONSTITUTION:The weight of a heavy bob 23 stuck to a piston 22 is made somewhat larger than that of a heavy bob 13 stuck to a piston 12, and the gas pressure in the first gas holder H1 is made about 500mm.Aq and the gas pressure in the second gas holder H2 is made about 550mm.Aq, for example. The first gas holder H1 is initially set to retain a protective space A at its bottom, but the second gas holder H2 is set at a state not retaining a protective space at its bottom. When valves 3a, 3b are opened and gas is fed through a feed pipe 4 connected to a communicating pipe 3, the gas first flows into the first gas holder H1 with a smaller piston pressure load, the piston 12 floats up to get into contact with a stopper 15u, but the gas continues to flow in, and when its pressure reaches 550mm.Aq, it flows into the second gas holder H2 automatically, and the gas feed is stopped when the piston 22 is lifted to a position retaining a protective space B above the piston 22. |
