| 摘要 |
PROBLEM TO BE SOLVED: To more uniformly supply a reducing agent by comparatively simple control.SOLUTION: A valve member 6 has a plurality of planar blade members 21-24, and is displaceable between an open state in which each blade member is disposed along a flow direction of a reducing agent in a second pipe member 5 to generate a gap between adjacent blade members and a closed state in which each blade member is disposed in a facing manner in the flow direction so that the gap between the adjacent blade members becomes smaller than that in the open state. The plurality of blade members 21-24 are displaced synchronously or independently so that an opening of the second pipe member 5 is adjustable. |
