Frequently Asked Questions
What is the purpose of the extended stem in buried service applications?
The extended stem is designed to allow valve operation even when the valve is installed underground or in buried pipelines. It ensures that stem seal failures do not prevent the valve from being actuated, maintaining reliable control over the pipeline flow without requiring excavation.
How does the fully welded body construction prevent leaks?
The fully welded one-piece body eliminates threaded or bolted connections that are common leakage points in traditional valve designs. By reducing the number of joints, the welded construction significantly improves long-term sealing performance, making it ideal for medium-pressure pipeline systems.
What makes the trunnion-mounted design beneficial for low-torque operation?
In a trunnion-mounted ball valve, the ball is mechanically supported at the top and bottom by trunnions, which absorb the line pressure forces. This means the seats only need to provide sealing without bearing the full hydraulic load, resulting in significantly lower operating torque — especially important at full rated pressure.
What does the Double Block-and-Bleed (DBB) feature do?
The Double Block-and-Bleed configuration provides two independent sealing points with a bleed port between them. This allows operators to safely isolate a section of pipeline on both sides of the valve and vent any trapped pressure from the cavity, enabling maintenance or inspection to be carried out safely without depressurizing the entire system.
What safety features are included to protect against fire and blowout risks?
The valve is equipped with an anti-blowout stem that prevents the stem from being ejected under high pressure, an anti-static device that dissipates static electricity buildup, and fire-safe seats that maintain a reliable metal-to-metal seal in the event of a fire that destroys soft seat materials — collectively ensuring safe operation in critical and hazardous environments.
Can the valve materials be customized for specific media or temperature conditions?
Yes. The body, seat, and sealing materials are fully customizable to suit a wide range of applications. Whether handling corrosive media, high-temperature gases, or cryogenic fluids, material specifications can be tailored to meet the exact requirements of your project, ensuring both compatibility and long service life.
Shoulong Valve
