Use:

A68SB-C,at a working temperature less than 425℃,A68SB-I,at a working temperature less than 510℃,A68SB-V,at a working temperature less than 550℃,are used for the equipment and pipelines with such media as steam as an overpressure protection device.

Characteristics：

1.Adjusting the reseating pressure with a back pressure jacket,to achieve the minimum blowdown.2.High-performance and high-temperature materials are used foe disc to ensure its tightness in high temperature.3.The sealing pair surface adopts overlay welding of Co-based Stellite to avoid cavitation caused by high-temperature steam.4.A thermal state test can make the safety valve closer to working conditions.