Low pressure seal test 4.4.1 for low pressure seal test, the sealing surface should be kept clean, no oil, no grease and seal fat, for to prevent scratches.
低压密封试验4.4.1进行低压密封试验时，低温阀门密封面应保持干净，无油、无油脂和密封脂，如需防止擦伤。
No Screw Thread Connect Fix, No Sway Rotate Connect, Two Layer Seal, Distinctive Seal Protect Craft, Prevent Impurity Enter The Seal Layer.
无螺纹连接固定，无摆动旋转连接，双层密封，独特密封保护工艺，防止水中杂质进入密封层。
No Screw Thread Connect Fix, No Sway Rotate Connect, Two Layer Seal, Distinctive Seal Protect Craft, Prevent Impurity Enter The Seal Layer.
无螺纹连接固定，无摆动旋转连接，双层密封，独特密封保护工艺，防止水中杂质进入密封层。
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