Views: 0 Author: J-VALVES Publish Time: 2026-04-14 Origin: Site
In high-pressure pipelines, large-diameter systems, and critical process lines, ordinary ball valves often run into the same problems: high operating torque, unstable sealing, and frequent maintenance.
That is where the 2PC trunnion mounted ball valve stands out.
“2PC” means a two-piece body design. With the trunnion mounted structure, the ball is supported from both ends instead of floating under line pressure. In practice, this means more stable sealing, lower torque, and better performance in larger sizes and higher-pressure service.
Many users face these issues in daily operation:
Manual operation becomes difficult as pressure increases.
Larger sizes place more load on the ball and seats.
High-viscosity, dirty, or flammable media can create extra wear and instability.
Unplanned shutdowns quickly drive up maintenance costs.
These problems are not solved by changing the brand alone. The valve design itself must match the service conditions.
Stable sealing performance
The trunnion design keeps the ball in a fixed position, helping maintain consistent sealing under pressure changes.
Lower operating torque
Compared with a floating ball valve of similar size, a trunnion mounted valve usually requires less force to operate, which makes actuator selection easier.
Low flow resistance
A full-bore design helps reduce pressure drop, making it suitable for oil, gas, water, chemicals, and high-viscosity media.
Broad application range
It is commonly used in oil and gas pipelines, chemical plants, water systems, and other demanding industrial processes.
In simple terms:
Item | Standard Ball Valve | 2PC Trunnion Ball Valve |
Sealing Force Principle | Mainly relies on medium pressure to push the ball for sealing | Distributes ball load through fixed support structure, independent of medium pressure |
Working Condition Adaptability | More sensitive to working conditions as diameter and pressure increase | More stable performance under high-pressure and large-diameter conditions |
Application Scenarios | General conventional systems | Critical pipelines, continuous production systems |
Safety & Reliability | Conventional safety level | Higher reliability for projects with stricter safety requirements |
This valve is a strong choice for:
Oil and gas transmission
Refining and petrochemical service
Natural gas stations
Chemical pipelines
High-pressure water systems
High-viscosity fluid lines
Processes requiring tight shutoff and reliable isolation
For large sizes and higher pressure ratings, the structure becomes even more valuable.
A well-designed 2PC trunnion mounted ball valve should deliver more than simple on/off control. It should also provide:
Sufficient body strength for long-term pressure service
Reliable seat design for consistent shutoff
Material compatibility with corrosive or aggressive media
Optional fire-safe, anti-static, low-temperature, or sour service capability
Proper flange connection, actuator matching, and installation fit
These details decide whether a valve is merely usable or truly dependable.
Many buyers focus only on size and pressure rating, but overlook:
The actual medium and its corrosive or flammable properties
Whether full-bore, low-torque, or remote operation is required
Whether the system can tolerate downtime for maintenance
Missing these points often leads to a poor selection.
If your project needs high-pressure capability, large-size stability, low leakage risk, and long-term reliability, a 2PC trunnion mounted ball valve is often the better choice. It is not just a product upgrade; it is an engineering solution built for critical service.
