Plastics piping systems . unplasticized poly vinyl chloride end - load - bearing double socket joints . test method for leaktightness and strength while subjected to bending and internal pressure 塑料管道系统.未增塑聚氯乙烯端点负载轴承双承窝接头.经受弯曲作用和承受内压时测定其防泄漏性和强度的试验方法
Plastics piping systems - elastomeric - sealing - ring - type socket joints for use with unplasticized poly vinyl chloride pipes - test method for leaktightness under internal pressure and with angular deflection 塑料管道系统.与未增塑聚氯乙烯管件一起使用的合成橡胶密封圈式承窝接头.内压下角度偏转防泄漏试验法