Trunnion-mounted, top-entry ball valve with soft seats, designed for on/off isolation in large-diameter or high-pressure liquid and gas pipelines. API 6D construction allows internal access from the top, enabling maintenance without removing the valve from the line.
Top-entry valves are selected where line disassembly is impractical, such as buried pipelines, insulated lines, large DN, or restricted access locations. Seat, ball, and stem maintenance is performed via the top cover, following depressurization, drainage, and lock-out procedures.
Soft seats are used for clean liquids or gases where low seat leakage is required and temperature remains within seat material limits. For slurry, solids, high abrasion, or temperatures above soft-seat limits, metal-seated valves should be considered.
Side-entry valves are suitable when the valve can be removed or serviced laterally. Top-entry is preferred where the cost of disconnecting, realigning, or reinsulating the pipeline is significant.
When is trunnion preferred over floating?
For large DN or high differential pressure, where lower operating torque and reduced seat loading are required.
What information is needed for specification?
NPS/DN, Class/PN, process media, temperature, body material, end connections, seat material, fire-safe requirement, actuator type, and maintenance philosophy.
Size：2"~60" (DN50~DN1500)
Pressure Rating: ASME CLASS 150~2500(PN16~PN420)
Body material：Carbon steel, Stainless steel, Alloy steel, Duplex stainless steel, exotic alloy etc.
End connection： FLNG, BW,ect.
Operation：Manual, Pneumatic, Electric, Hydraulic,ect.
