| 摘要 |
There is provided a valve apparatus in which a flow rate of taking-out gas is not lowered even if primary pressure is reduced, residual pressure can be secured in a gas container, a valve can easily be opened during a gas-charging operation, and reduced gas pressure can finely be controlled to predetermined secondary pressure. A pressure-reducing member (16) is biased in a valve-opening direction by a valve-opening spring (18). A pressure-receiving chamber (19) is formed on a side opposite from a pressure-reducing valve seat (15) across the pressure-reducing member (16), and the pressure-receiving chamber (19) is brought into communication with the outlet passage (11) through a pressure-reducing communication passage (20) which penetrates the pressure-reducing member (16). A residual pressure keeping valve box (24) is disposed in the outlet passage (11) so as to move toward and away from the pressure-reducing member (16). A closing operating portion (31) is provided on an outer surface of the residual pressure keeping valve box (24) so as to face the pressure-reducing communication passage (20). A return spring (34) is disposed between the residual pressure keeping valve box (24) and a housing (2), and the residual pressure keeping valve box (24) is biased toward a gas-taking out attitude (Y) which is separated from the pressure-reducing member (16). If the residual pressure keeping valve box (24) is switched to the gas charging attitude which is adjacent to the pressure-reducing member (16), the pressure-reducing communication passage (20) is closed by a closing operating portion (31).
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