Trunnion Mounted Ball Valve

Naishi side entry trunnion mounted ball valves are quarter-turn valves engineered for high-performance flow control in demanding applications. Designed and manufactured in full compliance with API 6D standards, these valves are ideally suited for high-pressure and large-diameter pipelines where tight shut-off and low operating torque are essential.
The trunnion-mounted design provides additional support to the ball through a shaft structure (trunnion), which absorbs flow pressure and reduces stress on the seats, enhancing durability and performance. The side-entry structure allows easier maintenance and component replacement.
Key Features:
● Robust Construction – High-quality valve body with bolted middle flange and neck, equipped with ball test fittings.
● Double Block and Bleed (DBB) – Valve seats feature a single-piston effect on both upstream and downstream sides, enabling DBB functionality.
● Reliable Sealing – Three seal types between ball and seat: soft seal, triangular ring seal, and metal-to-metal hard seal.
● Safety Stem Design – Blowout-proof stem ensures operational safety.
● Fire-Safe & Anti-Static – Fire-safe structure and anti-static devices meet safety requirements for critical applications.
● Emergency Seal Injection – Sealant injection ports for seat and stem, each equipped with a grease valve and check valve for emergency repairs.
● Drain & Vent Ports – Bottom drain and top vent valves for safe cavity maintenance and cleaning.
● Actuator Compatibility – Supports manual, pneumatic, electric, and hydraulic actuators.
● Welded-End Adaptability – Welded ends can be material-matched with the pipeline. Sleeve extensions ensure weld integrity without compromising sealing surfaces.
● Underground Installation Ready – Extended stems allow above-ground operation, with accessible injection, drain, and vent functions; stem height customizable.