A42Y-C type are used for the equipment and pipeline of the air, petroleum gas, liquid etc medium what the workingemperature are less than 300℃.A42Y-P type and A42Y-R type are used for the equipment and pipeline of the quality with corrode medium whatthe working temperature are less than 200℃. Take for extra pressure protection devices.Flange connecting dimensions of comply with Standard series one of JB/T……-94, Comply with Standard serieswo of JB/T……-94 when more than 6.4MPa.