This paper discussed the method of probability design(reliability design), given calculation formula of reliability on hydraulic pressure component, and illustrated by living example.

本文论述了概率设计（可靠性设计）的方法，给出了液压元件的可靠性计算公式，并举实例作了说明。

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A new type of electro hydraulic digital relief valve, which is a pilot pressure control component directly controlled by digital information is introduced.

介绍的新型电液数字溢流阀是一种数字信息直接控制的导控式压力控制元件。

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To reduce heat generation of the hydraulic system the main component pressure of the loader hydraulic system under different working conditions is tested, the pressure loss of each part is analyzed.

为研究热量产生的原因，从系统上减少热量的产生，测试了装载机液压系统在不同工况下各主要元件的压力点压力，分析了各部分的压力损失情况。

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