Backing ring material: soft iron, carbon steel and low alloy steel, stainless steel
Ring type: R type: R24.R26.R27.R31.R35.R37.R39.R41.R44.R45.R46.R47.R49.R50
BX type: BX152.BX153.BX154.BX155.BX156.BX157.BX158.BX159.BX160.BX161.BX162
Working pressure: -29 ～ 121 ℃, P/U
Temperature level: AA, BB, CC, DD, EE, FF
