本文介绍了功率键合图的基本概念，以直动式溢流阀为例，讨论了键合图的建立、状态方程的建立、液压系统动态响应的数字仿真方法。
This article introduces the fundamental concept of power bond graphs, and discusses how to establish bond graphs, status equations, and digital simulation of dynamic responses in a hydraulic system.
通过各种曲线表明，直动式纯水液压溢流阀满足要求。
Various curve shows that the water hydraulic pipe-mounted relief valve meets the requirements.
然而，水压传动技术的应用必须以性能优良的水压元件为前提，而直动式水压溢流阀阀口的压力特性对水压控制系统有着重要影响。
This paper carries out the thorough analysis and research to the pressure characteristics of the water direct-actuated relief valves by experiment and simulation.
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