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Cryogenic Trunnion Mounted DBB Ball Valve F316 - Gear Operated | China Suppliers & Factory
Key Features
Trunnion Mounted Ball Design
Protects upstream and downstream seats from excessive load for long service life.
Extended Stem with Cryogenic Neck & Anti-Blowout
Prevents cold transfer to packing and actuator, and ensures stem retention under pressure.
Lip Seal Design
Enhances sealing reliability under extreme low temperatures.
Worm Gear Operator with ISO 5211 Mounting
Reduces operating torque for precise control; can be upgraded to electric or pneumatic actuation.
Frequently Asked Questions
What is a trunnion mounted ball valve and why is it preferred for high-pressure applications?
A trunnion mounted ball valve features a ball that is mechanically anchored at both the top and bottom by a trunnion support, preventing the ball from shifting under high pressure. This design offloads the force from the seats, significantly reducing seat wear and extending service life — making it ideal for high-pressure and large-diameter pipeline applications.
How does the extended cryogenic neck stem protect the valve in low-temperature service?
The extended cryogenic neck creates a sufficient distance between the cold medium and the packing gland area, preventing the extreme cold from reaching the packing and actuator. This maintains packing flexibility and sealing effectiveness, while the anti-blowout stem design ensures the stem cannot be ejected under line pressure, providing an additional layer of safety.
What temperatures can the lip seal design handle in cryogenic valve applications?
The lip seal design is engineered specifically for cryogenic service, capable of maintaining reliable sealing performance at extremely low temperatures, typically down to -196°C (-320°F) for LNG and liquid nitrogen applications. The lip seal geometry compensates for thermal contraction, ensuring consistent sealing integrity across the full operating temperature range.
What is ISO 5211 mounting and how does it benefit valve actuation upgrades?
ISO 5211 is an international standard that defines the interface dimensions between a valve and its actuator. Valves with ISO 5211 compliant mounting pads allow for direct, standardized attachment of electric, pneumatic, or hydraulic actuators without the need for custom adapters. This makes future automation upgrades straightforward and cost-effective.
Can the worm gear operator be replaced with an electric or pneumatic actuator in the field?
Yes. Thanks to the ISO 5211 standard mounting interface, the manual worm gear operator can be easily replaced with an electric actuator or pneumatic actuator in the field. This modularity allows operators to automate valves as process requirements evolve, without replacing the entire valve assembly.
What industries typically use cryogenic trunnion ball valves with these key features?
Cryogenic trunnion ball valves with these features are widely used in LNG (liquefied natural gas) terminals, liquid oxygen and nitrogen plants, air separation units, petrochemical processing facilities, and industrial gas storage and distribution systems — anywhere that reliable shut-off and control of extremely cold media is required.