DIN EN ISO 13844 E:2013-09 塑料管道系统 用于塑料压力管道的弹性密封环型承插接头 负压、角偏转和变形下密封性的测试方法(草案)
Plastic piping systems Test method for sealing properties of elastic sealing ring-type socket joints for plastic pressure piping under negative pressure, angular deflection and deformation (draft)