求翻译：球阀的阀针质量轻，弹簧预紧力大，可获得更加宽广的动态流量范围。球阀具有自动定心作用，密封性好。同时，球阀简化了计量部分的结构，有助于提高喷油量精度。是什么意思？

Ball valve valve pin light, spring preload, broader availability of dynamic flow range. The ball valve with self-centering effect, sealing well. At the same time, the ball valve to simplify the measurement part of the structure, help to improve the accuracy of the fuel injection quantity.

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PIN light weight of ball valve, spring preload, you get broader dynamic flow range. Ball valve with auto-centering effect, good sealing. At the same time, ball valves simplify measuring parts of the structure, helping to improve fuel injection volume precision.