1)A48Y type are used for the equipment and pipeline of the with steam and air etc medium what the working temperature are less than 350 degree celsiur.

2)A44Y type are used for the equipment adn piple of the with air and petroleum gas    medium what the working temperature are less than 300 degree celsiur.

Take for extra presurre protection devices.

Flange connecting dimensions of comply with standard series first of JB/T-94 when the pressure less than 6.4Mpa. COMPLY WITH STANDARD SERIES TWO OF JB/T-94 when more than 6.4Mpa