| 摘要 |
PROBLEM TO BE SOLVED: To restrain generation of NOx (nitrogen oxide) by promoting pre-mixture of fuel gas and air.SOLUTION: The fuel gas injection valve comprises: a holder 22 having a first injection hole 61 for injecting fuel gas that is premixed fuel, and a second injection hole 62 for injecting fuel gas that is diffusion fuel; a first needle valve 23 that slidably moves reciprocatively in an axial direction in the holder 22 and opens/closes the first injection hole 61 and the second injection hole 62; and a second needle valve 25 that is provided with a seal face 94 contacting a needle valve seat 93 provided on the holder 22 at its tip, that is provided with a through hole 91 in which the first needle valve 23 is slidably inserted at a radial center part in an axial direction, that reciprocates in the holder 22 in the axial direction and blocks circulation of the fuel gas to the first injection hole 61 and the second injection hole 62 when the seal face 94 contacts the needle valve seat 93, and that allows circulation of the fuel gas to the first injection hole 61 or the second injection hole 62 when the seal face 94 is away from the needle valve seat 93. |
