Trunnion Mounted Ball Valve is usually designed as DBB. For Floating Ball Valve, the ball is floating slightly when it is under the pressure as required.
The following are the frequently requested seat material for ball valve. The seat material selection maily depends on pressure rating and temperature.
Below is a listing of the basic specifications used in the design and manufacture of valves and fittings for valve manufacturer.
API 600 Trim Number Chart: The Seat, Disc, Back Seat, Stem Material of Trim No. 1, 5, 8, 10, 12, 13,14, 15 and all other API Trim No. included.