求翻译：］,属于多孔闭式喷油器，它由喷油嘴、缝隙式滤清器偶件，喷油器体顶杆、弹簧和固定螺母及调压螺母等组成。喷孔数×喷孔直径×喷孔角度＝7×0.25×140°。针阀导向圆柱面上有两道环槽，起密封和布油润滑作用，针阀锥角60°，针阀升程为0.4-0.5m m，针阀开启压力为20MPa。它的主要特点是在喷嘴前增加了一个高压缝隙式滤清器。其目的是为了进一步滤清杂质，以减轻喷油偶件的磨损和喷孔堵塞，延长喷油嘴的使用寿命。是什么意思？

, Belonging to the porous closed injector, which consists of gap-type filter coupled parts of the fuel injectors, injector body ejector spring and the retaining nut and regulator nut and so on. Nozzle number × nozzle diameter × 7 × 0.25 × 140 ° Spray Angle. Prescribe ring groove of the cylindrical s