通过液压冲击现象的机理研究，找到其影响因素，设计的旋转换向阀及液压系统。

Via the mechanism research of the phenomenon of hydraulic shocks, the shock factors are found and designs of the rotating reversing valve and hydraulic system are finished.

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基于以上现象，对控制支腿缸的换向阀结构进行了改进，通过在原有换向阀的基础上增加一过载阀及4个单向阀解决了上述问题。

Whereas clause, the structure of valve had been improved, holding valve and over load valve had been added in it. The problem had been resolved by means of above.

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