Cryogenic Ball Valve (LNG Service)

This product description details a high-specification Cryogenic Ball Valve, designed specifically for use in extremely cold environments, such as those encountered in Liquefied Natural Gas ( $\text{LNG}$ ) production, transportation, and distribution.

These fixed ball valves are built to withstand severe operating conditions while ensuring reliable, low-torque isolation and advanced safety features.

📋 Technical Standards & Specifications

Parameter	Detail / Standard
Valve Type	Fixed (Trunnion Mounted) Ball Valve
Media	Cryogenic Fluids (e.g., $LNG$ )
Size Range	$\text{2}''$ to $\text{48}''$
Pressure Class	$\text{ASME CL} 150, 300, 600$ ( $\text{PN}$ Design available)
Body Material	Cast Steel, Stainless Steel ( $\text{CF}8\text{M}$ ), Special Alloys, $\text{CI}$ , $\text{DI}$
Design Standard	$\text{API} 6\text{D}, \text{BS} 5351, \text{ASME B} 16.34$
End-to-End Standard	$\text{ASME B} 16.10, \text{API} 6\text{D}$
Flange Standard	$\text{ASME B} 16.5 / \text{ASME B} 16.47$
Butt-Weld End Standard	$\text{ASME B} 16.25$
Testing Standard	$\text{API} 598, \text{API} 6\text{D}$ (100% tested before delivery)
Fire Safe Test	$\text{API} 607, \text{API} 6\text{A}$
Warranty	18 months after shipment, 12 months after installation
Delivery Time	$\text{15} - \text{30}$ days

⭐ Key Design Features (Double Block and Bleed – $\text{DBB}$ )

The fixed ball valve is engineered as a side-entry, fixed ball valve with two independently floating seats, ensuring bi-directional sealing and advanced safety:

Double Block and Bleed ( $\text{DBB}$ ):
- Allows both the upstream and downstream seats to seal simultaneously against the closed ball.
- The pressure trapped in the valve cavity can then be vented ( $\text{bleed}$ ) through a drain fitting.
- Benefit: This feature allows for the verification of seat tightness while the valve remains in line, which is critical for maintenance and safety in $\text{LNG}$ service.
Low Operating Torque: The design of the floating seats minimizes the torque required to operate the valve without compromising the sealing force across the full-pressure range ( $\text{zero}$ to maximum rated pressure).
Cavity Self-Pressure Relief: An internal mechanism ensures that any excessive pressure buildup within the valve cavity (e.g., due to fluid heating/expansion) is automatically relieved into the lower pressure side of the pipeline.
High-Level Safety Features:
- Fire Safe Design: Ensures external integrity during a fire event.
- Anti-Blowout Stem: Prevents the stem from being ejected under pressure.
- Anti-Static Design: Prevents the accumulation of static electricity that could ignite flammable vapors.
- ISO $5211$ Mounting Pad: Standardized connection for easy mounting of actuators.
- Locking Device: For manual operation, ensures the valve cannot be accidentally opened or closed.
- Emergency Grease Injection: Allows temporary sealing via injection in case of primary seal failure.

🏭 Application

This $\text{DBB}$ Fixed Ball Valve is specifically suited for the severe conditions of the Oil and Gas sector, including:

Production and Transportation: Main isolation points on pipelines.
Storage and Distribution: High-integrity isolation for $\text{LNG}$ storage terminals.
Metering Stations: Where verifiable shut-off is essential for custody transfer.