The seat material shall be one of the following materials: ethylene-propylene-diene monomer (EPDM) or fluoroelastomer (FPM) with polytetrafluoroethylene (PTFE) bearing support at the top and bottom.

 
  • 阀座材料应该是下列材料之一:乙烯-丙烯-二烯系单体(三元乙丙橡胶)或氟橡胶(FPM),在顶部和底部配置聚四氟乙烯(PTFE)轴承支撑。
今日热词
目录 附录 查词历史