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For example elbow DN50R1.5, PN16 What is the meaning of each parameter DN table nominal pass through, r1.5 table bending ratio, which is 1.5 times the nominal diameter, PN table pressure rating of 1.6Mpa. The pipe size is DN * 3.5 or Ф * 3.0. DN Nominal Nominal diameter, Ф Table diameter (usually for seamless steel pipe), the suffix digital table wall thickness. If there is no material requirements, the default Q235 material or 20 # steel.