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China Fully Welded Trunnion-Mounted Ball Valve Factory: Extended Stem for Underground Pipeline Suppliers
Extended stem for buried service
Enables reliable operation in underground or buried installations, even if stem seals fail.
Leak-resistant welded body
Fully welded one-piece construction minimizes leakage points for long-term medium-pressure pipeline reliability.
Low-torque operation
Trunnion-mounted design absorbs line pressure, ensuring smooth valve operation at full rated pressure.
Safe isolation and venting
Double block-and-bleed (DBB) design allows controlled venting and secure pipeline isolation during maintenance or emergencies.
Enhanced safety features
Anti-blowout stem, anti-static device, and fire-safe seats protect against critical and flammable conditions.
Flexible material options
Body, seat, and sealing materials can be tailored for various media, temperatures, and project requirements.
An extended stem allows operators to access and actuate the valve from above ground level, making it ideal for underground or buried pipeline installations. Even if the stem seals experience failure, the valve can still be operated safely and reliably.
A fully welded one-piece body eliminates threaded or bolted end connections, which are common leakage points in traditional valve designs. This construction significantly enhances long-term sealing integrity, especially in medium-pressure pipeline systems.
In a trunnion-mounted ball valve, the ball is mechanically anchored at both the top and bottom by trunnions, which absorb pipeline pressure loads. This prevents the ball from pressing against the downstream seat under pressure, resulting in significantly lower operating torque compared to floating ball valves.
Double Block-and-Bleed (DBB) refers to a valve configuration that provides two independent seating surfaces, each capable of sealing against pipeline pressure from a single valve body, along with a bleed port between them. This allows operators to safely vent trapped pressure and verify isolation integrity during maintenance or emergency shutdowns.
These valves are equipped with an anti-blowout stem design to prevent stem ejection under pressure, an anti-static device to safely discharge static electricity buildup, and fire-safe seats that maintain a reliable seal even when soft seat materials are damaged in high-temperature or fire conditions.
Yes. The body, seat, and sealing materials can be selected or customized to suit a wide range of media types, including corrosive, high-temperature, or cryogenic fluids. This flexibility ensures compatibility with diverse industrial project specifications and environmental requirements.