Top entry ball valves are valves that assembled its ball from top side part. It just like a globe valve that has body and bonnet except the trim part utilize a ball type. It comprises a one single body. Top Entry Ball Valves with a one-piece body design that allow in-line maintenance.
Top entry ball valves are bi-directional sealing with two independent floating seats. They feature a double block and bleed, fire safe design and an anti blow-out stem. The top entry trunnion supported design and unique seat retraction technique gives the convenience of in-line repair or replace valve internal components without dismantling it from pipe line.
The top entry ball valves are available in size 2" ~24" , ANSI class rating 150 to 1500 and temperature ratings of -46 C to 200C . All meet the fire safe requirement of BS 6755 and API 6FA.
Advantage & Benefit:
• Self-Adjusting Seats: Compensate for Wear & Temperature Fluctuations
• Spring Loaded Low Pressure Seals
• Pressure Activated Seating
• Built-In Antistatic Feature
• Simplified In-line Service
Relia top entry type ball valve in the pipeline is simple and rapid demolition, maintenance convenient. When the valve in the pipeline fails to repair, do not have to remove the valve from the pipeline, just remove the flange bolts and nuts, the valve cover and stem assembly removed from the valve body, and then remove the ball and valve seat assembly.
Usually top entry ball valves are made from casting metal.Since it made from casting it will need some additional NDE test to make sure that there is no defect from the casting process.
Top Entry Ball Valve Drawing
Top Entry Ball Valve, Trunnion Mounted, Carbon Steel Body