Forged Steel Ball Valves

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:
● 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