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    • 9. 发明专利
    • MIXING APPARATUS FOR ULTRA-HIGH PURITY GAS
    • JPS62110737A
    • 1987-05-21
    • JP25070085
    • 1985-11-11
    • MOTOYAMA ENG WORKS
    • SUGANO YOICHIUCHISAWA OSAMUOMI TADAHIRO
    • B01F3/02B01F5/00
    • PURPOSE:To obtain the titled apparatus preventing pollution by connecting plural mixing valves consisting of two pieces of on-of valves to a common flow path via an outflow path having minimum volume and connecting a common flow path of the mixing valve in an upstream side to the other inflow path of the mixing valve in a downstream side. CONSTITUTION:The mixing valves 24 are connected to the feed lines 20 of the ultra-high purity gases A-F. The mixing valves 24 have two pieces of on-off valves 25, 26 and are provided with the inflow paths 27, 28 and the outflow paths 29, 30 having minimum inner volume. In this constitution, for example, in case of mixing the gases B, D [(a)-(f) are given in accordance with the gases A-F], the on-off valves 25a, 25b, 26b, 25c and 26d are opened and the other on-off valves are wholly closed. In this state, gas B is led to a flow path 33 of gaseous mixture via the on-off valves 26b, 25a. On the other hand, gas D is mixed with gas B in a common flow path 31b via the on-off valves 26d, 25c, 25b. Only the on-off valve 26b is connected in parallel and the flow path of a downstream side wherein the gases B, D are passed is interrupted for the flow path in an upstream side by means of the on-off valve 25d.