| 摘要 |
PROBLEM TO BE SOLVED: To provide a pressure-reducing simultaneous open valve which has a check-valve function as well as an airtight sealing function. SOLUTION: Within a valve housing 4 a primary-side chamber 5 and a secondary-side chamber 6 are separated by a partition wall 7, through which an opening 8 is pierced. A pressure control chamber 10, linking to a sensor line, is provided in the primary-side chamber 5 and a valve element 11 which open/close the opening 8 with a flexible up-and-down movement is built in the pressure control chamber 10. On the upper edge of the valve element 11 a flange 22 with a pore 28 piercing from the first-side chamber 5 to the pressure control chamber 10 is provided. The top end of the pore 28, which opens up to the pressure-control chamber 10, shows a check-valve function by fitting a resilient circular packing 29 of a U-shaped cross section over the whole periphery of the flange 22. The packing 29 slides freely against an inner wall of the pressure control chamber 10 and also seals a space air-tightly between the inner wall of the pressure control chamber 10 and an outer rim of the flange 22.
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