Reduce the external leakage of valve valve packing system is the key to the material.
减少阀门外泄漏的关键在于阀门填料系统的材质。
API 598 test standard requires no visible external leakage (gasket, packing chamber and casting).
API 598测试标准要求没有肉眼可见的外泄漏。
API 598 test standard requires no visible external leakage (gasket, packing chamber and casting).
API 598测试标准要求没有肉眼可见的外泄漏。
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