Design according to API6D,ASME B16.34 Ispeciton and test to API598 Flange to ASME B16.5,DIN2543-2550 Material to NACE MR0175 Fire safe as per API607,API6FA.
The ball is assembled into the body from the top,thus the valves can be examined&repair online to reduce stoppage of device.
Seat inter-rolled can be to prevent the seat inserts being washed out.
Design of seat-assistant make body chamber grease urgently when firing.
