改写：Kerl8等人从实验入手对蝶阀的流场情况进行了研究并攥写了流场分析报告。Sarpkara9对蝶阀的流动特性进行理论研究使得蝶阀的流动状态有了理论依据。Kimura and Tanaka10研究了一些特殊蝶阀的压力损失特性。

Kerl and his team conducted an experimental study on the flow field of butterfly valves and wrote a report on the flow field analysis. Sarpkara carried out theoretical research on the flow characteristics of butterfly valves, providing a theoretical basis for the flow state of butterfly valves. Kimura and Tanaka investigated the pressure loss characteristics of some special butterfly valves.