Shoulong Valve
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Trunnion-mounted ball with dual metal seats provides reliable upstream and downstream isolation and safe cavity pressure relief.
Hardfaced metal seats ensure stable sealing performance under high temperature, high pressure, and abrasive severe service conditions.
Forged steel body with trunnion support reduces operating torque and maintains structural integrity under extreme pressure loads.
Metal seating design supports fire-safe performance and ensures reliable operation in critical oil, gas, and high-pressure applications.
A True DBB design features two independent seating surfaces that can each independently isolate pressure. The bleed function allows safe venting of trapped cavity pressure, providing superior safety compared to single-seat designs.
Metal-to-metal seats are engineered for extreme environments. They resist high temperatures, abrasive media, and erosive particles, ensuring a long service life where soft seats would fail.
In trunnion-mounted valves, the ball is fixed at pivot points, reducing operating torque and ensuring consistent sealing at high pressures. Floating balls rely on line pressure to push the ball against the seat, increasing torque at high pressures.
It means the valve maintains sealing integrity even after fire exposure. If soft seals burn away, the secondary metal-to-metal seal prevents dangerous leakage, meeting API 607/6FA standards.
They are widely used in oil and gas pipelines, petrochemical refineries, power generation, and subsea installations where reliable shutoff is required under severe service conditions.
Forged steel offers superior mechanical strength, a denser grain structure, and fewer internal defects. This makes it more resistant to pressure surges and fatigue in critical safety applications.
