A42Y-160/320 type are usedfor the equipment and pipeline of the air,N2, H2 mixed gas, etc.medium what the working tem-perature are less than 200℃. A42Y-160P/320P, A42Y- 160R/320R type are used for the eq-uipment and pipeline of the quality with corrode medium what the working temperature are less hom 200℃. Take for extra pre-ssure protection devices.Flange connecting dimen-sions of comply with Standardof JB/T2769-92.