API 6D Fully Welded Buried Trunnion Ball Valve (Reduced Pressure Drop)

This product is a highly specialized Fully Welded Buried Ball Valve conforming to $\text{API} 6\text{D}$ standards. It is a Trunnion Mounted (Fixed) design, specifically engineered for direct burial and use in high-pressure, high-volume oil and gas pipelines where minimal pressure drop and maximum flow efficiency are critical.

The full-bore or optimized reduced-bore design minimizes flow resistance, making it one of the most efficient valves available.

📋 Technical Specifications

Parameter	Detail / Standard
Valve Type	Trunnion Mounted (Fixed) Ball Valve
Construction	Fully Welded Body (Cylindrical)
Installation	Buried/Underground Service (No exposed flanges)
Design Standard	$\text{API} 6\text{D}$
Size Range	$\text{4}''$ to $\text{56}''$
Pressure Rating	$\text{150LB}$ to $\text{2500LB}$ ( $\text{ASME Class}$ )
Working Temperature	$\text{-29}^\circ\text{C} \sim 120^\circ\text{C}$ or $\text{-46}^\circ\text{C} \sim 120^\circ\text{C}$
End Connection	Butt-Weld Connection
Body Materials	$\text{A}105$ (Carbon Steel), $\text{LF}2$ (Low-Temp Carbon Steel), $\text{F}51$ (Duplex SS)
Operation Mode	Manual, Electric, Pneumatic, Gas-Over-Oil (Hydraulic-Pneumatic Linkage)

⭐ Core Design and Performance

Lowest Pressure Drop: The valve is noted for having one of the lowest pressure losses across all valve types at nominal flow rates. When fully open, the flow coefficient is nearly zero, equivalent to the flow resistance of a pipe segment of the same length.
Optimized Flow Channel:
- Reduced Bore Optimization: For the reduced-bore model, advanced fluid analysis and theoretical calculations are used to design the flow channel. This maximizes the valve’s flow capacity and minimizes the flow resistance caused by the reduced diameter section.
Fully Welded Body: The body is entirely welded shut, eliminating potential leakage points associated with body flanges or bolted connections. This is crucial for buried service where maintenance access is difficult and high pipeline integrity is required.
Trunnion Mounted: The fixed ball design ensures reliable, low-torque operation even at maximum pipeline pressure, making actuation easier and less costly.

🏭 Application and Reliability

Application Industry: Primarily used in Petroleum and Natural Gas transmission pipelines.
Buried Service: Specifically designed for underground installation, offering high resistance to external stress and environmental corrosion due to the robust welded body and use of suitable materials (like $\text{LF}2$ for lower temperatures).
High Integrity: The welded construction and $\text{API} 6\text{D}$ compliance provide the highest level of safety and reliability for major transmission lines.