| 摘要 |
PROBLEM TO BE SOLVED: To provide a gaseous matter flow control valve high in sealing performance, hardly receiving wind pressure, and hardly generating pulsation nor gas flow sound without influencing the other-side flow rate even when one-side flow rate is changed.SOLUTION: In this gaseous matter control valve 2 including a drive device 56 for moving an operation stroke of a valve element 6 between a first close position where a first valve part 46 abuts on a first valve seat 30 and a second close position where a second valve part 48 abuts on a second valve seat 34, the operation stroke includes: a first operation region where the flow rate of gas passing through the first valve part 46 linearly increases or decreases in accordance with the opening of the first valve part 46 and the flow rate of gas passing through the second valve part 48 does not change; and a second operation region where the flow rate of gas passing through the second valve part 48 linearly increases or decreases in accordance with the opening of the second valve part 48 and the flow rate of gas passing through the first valve part 46 does not change. |
