通过对精密加工件分配阀体主阀孔的加工工艺试验及研究，总结了一套行之有效的加工工艺。
A complete processing technology is summed up for the main valve opening of the dividing control valve in the fine machining pieces based on the study and test.
从JZ 7型空气制动机本身的结构出发，提出了客运机车分配阀的方案，研制了新的分配阀主阀。
Based on the inhouse structure of JZ-7 air brakes, the design scheme of distribution valves for passenger locomotives was proposed and the main valve of new distribution valves was developed.
后解体分配阀，发现主阀体工作面已擦伤。
After the disintegration of the distribution valve, the main body was found face has scratches.
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