Hydraulic hose assemblies - external leakage classification for hydraulic systems 液压软管组合件液压系统外部泄漏分级
2.
Standard method for the evaluation of external leakage of manual and automated on - off valves 手动和自动关闭阀门外泄露评估的标准方法
3.
These valves shall have ptfe seats and fpm seals for maximum service life and protection against external leakage 这些阀门应该配置聚四氟乙烯阀座和fpm密封，使其使用寿命更长，更有助于防止外泄漏。
4.
Valves shall have glass - filled ptfe seals for positive shut - off and extended service - life and fpm seals for maximum protection against external leakage 这种阀门应该配置玻璃填充聚四氟乙烯密封，关闭更加灵活，使用寿命更长， fpm密封能够更好的防止外泄漏。
