Direct way solenoid valves are adopted with low pressure air needed and good spraying effects.
采用直通式电磁阀，需用气源压力低，喷吹效果好。
The pores generated during spraying and the cracks generated during the course of thermal oxidization because of thermal stress are the direct reasons why coatings fail.
涂层在喷涂过程中所生成的气孔以及热氧化过程中由于热应力而产生的裂纹是造成涂层失效的直接原因。
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