Shoulong Valve
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Two independent balls provide complete upstream and downstream isolation, ensuring zero leakage.
Quickly release cavity pressure and easily check for leaks—safer and more reliable.
Trunnion-mounted design reduces torque and keeps sealing performance consistent under high pressure.
Dual block and bleed integrated in one body—fewer connections, less chance of leaks, and easier installation.
Bolted body design allows fast inspection and simple component replacement, saving time and effort.
Built to prevent static build-up, withstand fire, and eliminate stem blowout risks—perfect for oil, gas, and critical pipelines.
A Double Block and Bleed (DBB) ball valve features two independent seating surfaces that simultaneously block flow from both upstream and downstream directions. The integrated bleed port between the two seals allows operators to safely vent or drain the cavity pressure, confirming a leak-tight isolation before maintenance or inspection work begins.
In a trunnion-mounted ball valve, the ball is mechanically supported at both the top and bottom by trunnions, which prevents the ball from being pushed against the downstream seat under high pressure. This significantly reduces operating torque, extends seal life, and maintains consistent sealing performance—making it ideal for high-pressure and large-diameter applications.
Yes. The DBB ball valve is specifically engineered for demanding oil, gas, and petrochemical pipeline environments. Its fire-safe certified construction, anti-static stem, and dual-isolation capability make it compliant with industry standards such as API 6D and ISO 14313, ensuring safe operation under hazardous and high-pressure conditions.
A fire-safe valve is designed and tested to maintain its sealing capability even after a fire event, preventing catastrophic leakage. The anti-static stem feature incorporates grounding paths that dissipate any static electrical charges that could accumulate during operation, eliminating ignition risks in flammable or explosive media environments.
By integrating the dual-block and bleed functions into a single valve body, the compact DBB design replaces what would traditionally require multiple separate valves, fittings, and pipe connections. This reduces the total number of potential leak points, minimizes the overall system footprint, lowers installation costs, and simplifies future maintenance procedures.
The bolted body construction allows the valve to be quickly disassembled without special tooling. Internal components such as seats, seals, and balls can be individually inspected and replaced in the field, avoiding costly full-valve replacements. This design significantly reduces downtime and makes scheduled maintenance more straightforward and cost-effective.
