Fire safe is the standard design of all Sanseco ball valves. Sanseco soft seat ball valve fire safe tests were witnessed and certified by Lloyd's Register. Our in-house computerized fire test facilities are capable of testing and certifying of Sanseco floating and trunnion mounted ball valves per API 6FA and API 607.
Fire safe seat sealing for floating ball valves
When non-metal sealing material have decomposed or deteriorated by a plant fire, the upstream line pressure pushes the ball against the metal seat lip, beneath soft seat to shut off the line fluid and minimize internal leakage.
Fire safe seat sealing for trunnion mounted ball valves and gate valves
1. External leakage prevention
Leakage from the valve stem area is prevented by double o-ring sealing, packing and fire safe gasket. Leakage through the valve body joint is also blocked by double o-ring sealing and body gasket. After a fire has deteriorated o-rings, gland gasket, body gasket and stem, fire safe packing is the feature that prevents external fluid leakage.
2. Internal leakage prevention
When non-metal materials such as o-ring, seat insert and spacer have decomposed or deteriorated by fire, the edge of the metal seat, preloaded by the seat spring, comes into contact with the ball to shut off the line fluid and minimize internal leakage through the valve bore. Also the fire safe flexible graphite seat packing will be compressed by the seat spring to prevent fluid leakage between the valve body and the seat.
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Trunnion Mounted Ball Valves by Sanseco Group
Reliable performance in Long-term operation. Tailored to your needs. Quality from a single source.
