| 摘要 |
A method of metering fuel with a fuel valve (10) includes arranging a spool (12) within a sleeve (14) along an axis (A), wherein the spool (12) includes four seal lands (22A-22D). The sleeve includes a fuel inlet aperture (S34), a fuel outlet aperture (S36), and a shutoff port (S38). A first cavity (C1) and a second cavity (C2) are defined between the spool (12), the sleeve (14), and subsets of the seal lands (22A-22D). The fuel inlet aperture (S34) and the fuel outlet aperture (S36) abut one such cavity (C1,C2). Sliding the spool (12) along the axis (A) results in the fuel outlet aperture (S36) extending longitudinally beyond the second seal land (22B) in the upstream direction. |
