Forged Steel Trunnion Mounted Ball Valve

Naishi forged steel trunnion mounted ball valves are high-integrity quarter-turn valves designed for high-pressure, high-temperature, and severe service applications. Complying with API 6D, ASME B16.34, and relevant international standards, these valves offer enhanced reliability, safety, and long service life in demanding environments such as oil & gas, petrochemical, and pipeline transportation.

The trunnion design supports the ball with upper and lower shafts, effectively reducing operating torque and minimizing seat wear under high differential pressures.

Key Features of Forged Steel Trunnion Mounted Ball Valve:

      ● Forged Body Construction – High-strength forged steel body ensures superior mechanical performance and resistance to stress and fatigue.

      ● Double Block and Bleed (DBB) – Seats with single-piston effect provide sealing on both ends and allow for cavity pressure relief.

      ● Advanced Sealing System – Seat-to-ball interface includes soft seal, triangular ring seal, and optional metal seal to meet various working conditions.

      ● Blowout-Proof Stem – Bottom-entry stem design prevents blowout and ensures fire-safe operation.

      ● Fire-Safe & Anti-Static Design – Certified fire-safe structure with built-in anti-static devices for safe handling of flammable media.

      ● Emergency Sealant Injection – Grease injection ports on seat and stem for in-line sealing restoration, each with a check valve.

      ● Drain & Vent Ports – Top vent and bottom drain valves allow safe depressurization and cleaning of the cavity.

      ● Actuation Compatibility – Suitable for manual, pneumatic, electric, or hydraulic actuation.

      ● Welded-End Adaptability – Weld ends can be material-matched with the pipeline; sleeve extensions protect seals during installation.

      ● Buried Service Ready – Extended stems enable above-ground operation; grease injection, drain, and vent remain accessible. Stem height customizable