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。
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.
引风管上还设有调节器，可以控制进入管内的高压空气的流量。
The intake pipe is provided with a regulator which is capable of controlling the flow of the high-pressure air.
引风管上还设有调节器，可以控制进入管内的高压空气的流量。
The intake pipe is provided with a regulator which is capable of controlling the flow of the high-pressure air.
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