| 摘要 |
The invention comprises a fluid injector including a discharge passage, and a tip sealing valve for controlling fluid discharge through said passage, said tip sealing valve being responsive to a fluid differential operative thereon in a non-discharge condition of the fluid injector to close said discharge passage, said tip sealing valve being responsive to another fluid differential operative thereon in a discharge condition of said fluid injector to permit fluid discharge through said discharge passage, said tip sealing valve comprising first and second relatively movable parts with a spring means interposed between said parts, said first part having a cross-sectional area effective to the pressure of fluid flowing in said fluid injector in the non-discharge condition thereof such that said first part will be seated in closure relationship with said discharge passage, and said second part being responsive to the pressure of said fluid in said fluid flow to compress said spring means against said seated first part, by which the force with which said first part is seated is a function of said fluid pressure effective cross-sectional area of said first part and the rating of said spring means.
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