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Cryogenic Forged Trunnion Ball Valve Design - ISO 5211 | China Suppliers & Factory for High-Performance Solutions
Fixed Trunnion DBB Design
Maximizes safety and prevents leaks by isolating and venting hazardous fluids using the Double Block and Bleed (DBB) functionality.
Lip Seal Design
Utilizes a lip-type seat seal to enhance sealing performance, ensuring reliable operation in high-pressure and low-temperature environments.
Extended Stem Design
Effectively isolates the packing system from cryogenic media, preventing leakage and improving sealing reliability in cryogenic applications.
Three-Safety Design
Integrates fire-safe, anti-static, and anti-blowout stem features to ensure safety in critical applications and demanding environments.
Q What is a Fixed Trunnion DBB ball valve and how does it work?
A Fixed Trunnion Double Block and Bleed (DBB) ball valve uses a fixed trunnion to support the ball, allowing it to withstand high pipeline pressures. The DBB function enables the valve to simultaneously block flow from both upstream and downstream directions while venting the cavity between the two seats, ensuring complete isolation and safe maintenance of the pipeline system.
Q What are the advantages of a lip seal design in ball valves?
The lip seal design features a lip-type seat that dynamically conforms to the ball surface, providing superior sealing performance under varying pressure conditions. It is especially effective in high-pressure and low-temperature (cryogenic) environments, reducing seat wear and significantly extending the service life of the valve while maintaining a reliable, leak-tight seal.
Q Why is an extended stem design important for cryogenic valve applications?
In cryogenic applications, extreme low temperatures can cause the packing system to freeze or fail if it comes into direct contact with the cryogenic media. The extended stem design physically distances the packing assembly from the cold media, maintaining the packing within an acceptable temperature range, preventing leakage around the stem, and ensuring long-term sealing reliability and operational safety.
Q What does the Three-Safety Design include and why does it matter?
The Three-Safety Design incorporates three critical protective features: fire-safe construction (to maintain sealing integrity during fire events), anti-static design (to safely discharge electrostatic charges and prevent ignition), and anti-blowout stem design (to prevent the stem from being ejected under high pressure). Together, these features ensure the valve meets the most rigorous safety standards for hazardous and critical applications.
Q In which industries are these fixed trunnion ball valves commonly used?
Fixed trunnion DBB ball valves with these advanced features are widely used across industries including oil and gas production and transmission, LNG (liquefied natural gas) facilities, petrochemical and refining plants, subsea pipeline systems, power generation, and any other sector where high-pressure, cryogenic, or hazardous fluid isolation and safety are critical requirements.
Q What international standards do these valves typically comply with?
Fixed trunnion DBB ball valves with fire-safe, anti-static, and anti-blowout stem designs are generally manufactured to comply with internationally recognized standards such as API 6D (pipeline valves), API 607 (fire testing), ASME B16.34 (valves – flanged, threaded, and welding end), BS 5351 (steel ball valves), and ISO 14313, ensuring they meet strict quality, performance, and safety benchmarks required for critical industrial service.