API 6D Fully Welded Spherical Trunnion Ball Valve (High-Integrity Isolation)

This product is a high-specification Trunnion Mounted (Fixed) Ball Valve, designed and manufactured according to $\text{API}$ 6D standards. It features a robust, Fully Welded Spherical Body (筒形 or spherical shell design) and Butt-Weld End Connections, making it the ideal choice for non-accessible, buried, or critical mainline isolation points in the Oil and Natural Gas industry.

The fully welded construction ensures the highest degree of safety and reliability by eliminating all potential external leakage paths.

📋 Technical Specifications

Parameter	Detail / Standard
Valve Type	Trunnion Mounted (Fixed) Ball Valve
Body Construction	Fully Welded Body (Spherical/Cylindrical Shell)
Design Standard	$\text{API} 6\text{D}$
Size Range	$\text{8}''$ 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 (对焊连接)
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)
Application Industry	Petroleum and Natural Gas

⭐ Core Design and Reliability Advantages

Zero External Leakage: The Fully Welded Body eliminates bolted joints (such as body flanges), thereby removing the most common sources of external leakage and ensuring a maintenance-free, permanent seal, which is crucial for buried or inaccessible installations.
Trunnion Support: The fixed ball mounting system absorbs line pressure forces, leading to lower operating torque compared to floating ball designs, simplifying the requirements for the actuator, especially in large sizes ( $\text{56}''$ ).
High Flow Efficiency: Due to its inherent design, the ball valve offers the lowest pressure drop among all valve types when fully open, ensuring maximum flow throughput and minimum pumping costs.
Material Selection for Service:
- $\text{A}105$ for standard temperatures.
- $\text{LF}2$ (Low-Temp Carbon Steel) for cold service down to $\text{-46}^\circ\text{C}$ .
- $\text{F}51$ (Duplex Stainless Steel) for high-strength and corrosion resistance.
Safety and Compliance: Manufactured to $\text{API}$ 6D, guaranteeing critical features like $\text{DBB}$ (Double Block and Bleed) capability.