For laying indoors, in tunnel or pipe, unable to bear external mechanical force.
敷设在室内，隧道及管道中，不能承受机械外力。
Surface quality and mechanical properties of basic and pipe is the same.
表面质量和机械性能基本和管子是一样的。
The brake valve is simple in structure, can realize wire control of the brake pipe fluid pressure, and has the capacity of mechanical backup brake under the condition of the electrical fault.
本发明结构简单，能实现制动管路液压力的线控制，并具备电气故障下的机械备份制动能力。
The brake valve is simple in structure, can realize wire control of the brake pipe fluid pressure, and has the capacity of mechanical backup brake under the condition of the electrical fault.
本发明结构简单，能实现制动管路液压力的线控制，并具备电气故障下的机械备份制动能力。
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