valve tight shut-off test
...(X-ray and Ultra-sonic tests according to specifications) 阀门严密性试验。(Valve tight shut-off test) 用空气、水或氦气作泄漏等级试验。(ISO 5208标准)(Leakage tests with air, water and helium) .
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valve tight shut-off test
阀门紧密关闭试验
以上为机器翻译结果，长、整句建议使用 人工翻译 。