Ball of trunnion ball valve is fixed, it does not move with medium pressure. Trunnion ball valve has floating seats.  The seats move with the medium pressure to tight the ball and seal ring to ensure sealing reliability. Bearings could be mounted in top shaft and bottom shaft, which reduces operation torque. This is widely used in valves with high pressure and big sizes. To decrease the operation torque and increase sealing reliability, lubricated ball valves are adopted in recent years. A special sealant is injected between sealing faces of lubricated ball valve to create a layer. This increase the sealing reliability while decreasing the operation torque, which is better for high pressure, big sized ball valves.
 Design Feature: 
Trunnion Mounted. Side Entry/Top Entry. Independent Ball & Stem
Full Bore/Reduced Bore. Cast 2pcs Bolted Body /Forged 3pcs Bolted or Welded Body
Soft Insert Seat/metal–to-metal Seat
Anti-Blowout Stem. Fire Safe Design to API 6FA/607. Anti-static Device
Double Block & Bleed Function. With Vent and Drain Hole
Grease Injection on Stem & Seat . Extended Bonnet or Stem Optional
Specification:
Design: API 6D  API 608  BS5351  ASME B16.34
Size: 2"-40".  Pressure Rating: 150Lb-2500Lb
Face to Face: API 6D ,ANSI B16.10
End Connection: RF RTJ/ANSI B16.5&ANSI B16.47,  BW (ANSI B16.25)
Body Material: WCB, A105 CF8, CF8M, CF3, CF3M, F304, F316, F304L F316L LCB LF2  F51.
Ball Coating:  ENP,Tungsten Carbide Coat (TCC), Chrome Carbide Coat (CCC)
Test: API 6D API 598. Marking: MS SP-25
Actuation: Lever, Worm Gear, Electrical, Pheumatic,Hydraulic 
Standard Material Specification