3PC Trunnion Ball Valve Double Bleed Needle Valves DBB Function Ball Valve

Structural Features

A105 Forged Carbon Steel Body: Body made of ASTM A105 forged carbon steel, offering high strength, excellent pressure resistance, and good machinability for medium-to-high temperature applications.

Three-Piece Body Design: Body divided into left, right, and center sections, enabling online disassembly and maintenance without removing the entire valve from the pipeline.

Trunnion Mounted Ball Structure: Ball supported by upper and lower bearings, preventing displacement under medium pressure, ensuring stable sealing and low-torque operation for large-bore, high-flow applications.

Flange Connection: RF (Raised Face) flange connection per ASME B16.5, 150LB pressure class, ensuring reliable installation and sealing.

Double Bleed Valves Integration (DBB Function): Two bleed needle valves integrated on both sides of the body, achieving Double Block and Bleed functionality for safe cavity venting and drainage after valve closure, ensuring reliable process isolation.

Fire-Safe Design:Compliant with API 607 standard, maintaining sealing performance even during fire conditions to prevent medium leakage.

Anti-Static Device: Built-in anti-static device effectively prevents static electricity accumulation, reducing fire and explosion risks.

Blowout-Proof Stem Design: Stem designed with blowout-proof feature to ensure operational safety and prevent stem ejection under abnormal pressure.

Large-Bore Reduced Bore Design (8"x6"): 8-inch body with 6-inch flow bore reduced port design, providing sufficient flow capacity while reducing valve weight and cost for applications not requiring full port.

Technical Specifications

Application Fields

Oil & Gas: Long-distance pipelines, gathering stations, oil & gas processing facilities for medium isolation and venting, meeting DBB safety isolation requirements.

Petrochemical: Process isolation in refining units and chemical reaction systems, preventing medium cross-contamination and ensuring maintenance safety.

Power Generation: Steam, water, and fuel system pipeline isolation in thermal and nuclear power plants.

Coal Chemical: High-temperature, high-pressure medium control in coal gasification and coal-to-liquid facilities.

City Gas: Pipeline isolation and venting at city gas gate stations and pressure regulating stations.

General Industry: Control and isolation of water, oil, gas, and other media in large-diameter pipeline systems.

Advantages & Value

High Reliability: A105 forged carbon steel and trunnion mounted ball design ensure stable operation under large-bore, high differential pressure conditions, reducing maintenance frequency and downtime.

DBB Safety Isolation: Integrated double bleed valves achieve Double Block and Bleed functionality, meeting API 6D and process safety standards, ensuring complete cavity depressurization before maintenance and protecting personnel safety.

Easy Maintenance: Three-piece body design allows online maintenance, enabling replacement of seats, seals, and other wear parts without shutting down the entire pipeline, significantly reducing maintenance costs.

Large-Bore Flow Control: 8"x6" reduced bore design provides high flow capacity while optimizing valve weight and cost for large-flow applications.

Wide Applicability: Multiple seat material options (soft seal/hard seal) and broad temperature range enable adaptation to various complex working conditions and medium characteristics.

Cost Efficiency: Integrated DBB functionality eliminates the need for additional bleed valve installation, reducing pipeline system complexity and installation costs.