Gray76
Mechanical
- Mar 8, 2007
- 5
Hi,
Many trunnion ball valve manufacturers show a fire safe graphite seal located in a closed groove on the trunnion seat carrier.
As this is a closed groove, the graphite will have to be split/scarfed in order to fit. Maybe die formed ring or braided packing section.
Does anyone know how this design will seal against pressure if the O-Ring/Lipseal burns out during a fire test?
I'm puzzled as to how the split seal will hold pressure - granted, there is a generous leakage rate during a fire test.
Thanks in advance.
Many trunnion ball valve manufacturers show a fire safe graphite seal located in a closed groove on the trunnion seat carrier.
As this is a closed groove, the graphite will have to be split/scarfed in order to fit. Maybe die formed ring or braided packing section.
Does anyone know how this design will seal against pressure if the O-Ring/Lipseal burns out during a fire test?
I'm puzzled as to how the split seal will hold pressure - granted, there is a generous leakage rate during a fire test.
Thanks in advance.