A comparison among different kinds of brake pressure regulation methods in air brake system is made, including traditionary Pressure-limited Valve, Proportion Valve and ABS system.

对气制动系统制动压力调节的各种方法进行研究与对比，包括传统的限压阀、比例阀以及汽车防抱死系统。

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The mounted location of high-pressure safty valve and the connecting position of the control air pipe of air pressure relay of JZ-7 brake system are analysed.

对重联机车中JZ 7型制动机系统的高压安全阀的安装位置及打风压力继电器（调压器）控制风管的连接位置进行了分析、讨论，指出了现有机车中设计、制造上存在的缺陷，并在实际运用中进行了改造。

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