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China Suppliers Factory Class 600 Fully Welded DBB Ball Valve with Zero Leakage and High-Pressure Performance
Zero External Leakage
Fully welded one-piece body eliminates external leakage paths, ideal for subsea, underground, and harsh pipeline environments.
Stable High-Pressure Performance
Trunnion-mounted ball design ensures reliable operation under high-pressure conditions and enhances load-bearing stability.
Maximum Pipeline Safety
Double Block-and-Bleed (DBB) design provides secure isolation, safe maintenance, and enhanced operational safety.
Fail-Safe Stem with Anti-Static Protection
In critical and flammable applications, the anti-blowout stem with single or double piston effect (SPE/DPE) and built-in anti-static device ensures maximum safety.
Sour Service Capability
NACE MR0175-compliant materials guarantee reliable performance in sour, corrosive, and challenging service conditions.
Durable Sealing, Fire-Safe & Long-Term Reliability
Fire-safe design and advanced sealing technology ensure long-term performance and emergency sealing capability; available in full and reduced bore for optimized flow, supporting manual, electric, and pneumatic operation.
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What makes a fully welded trunnion ball valve different from a conventional flanged ball valve?
Unlike conventional flanged ball valves, a fully welded trunnion ball valve features a one-piece welded body with no bolted connections, which completely eliminates external leakage paths. The trunnion-mounted ball also provides superior load-bearing stability under high-pressure conditions, making it ideal for critical pipeline applications.
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What is the Double Block-and-Bleed (DBB) function and why is it important?
The Double Block-and-Bleed (DBB) function allows the valve to simultaneously block pressure from both upstream and downstream sides while bleeding the cavity between the two seats. This ensures complete isolation of the pipeline section, enabling safe maintenance, inspection, and emergency shutdown without shutting down the entire system.
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Is this valve suitable for sour gas or H₂S-containing environments?
Yes. The valve is manufactured using materials compliant with NACE MR0175 / ISO 15156 standards, which are specifically designed to resist sulfide stress cracking (SSC) and hydrogen-induced cracking (HIC) in sour service environments containing H₂S. This makes it reliable for upstream oil and gas, refining, and petrochemical applications.
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What does the anti-blowout stem with SPE/DPE mean, and how does it enhance safety?
The anti-blowout stem is designed to prevent the stem from being ejected under high pressure in the event of a packing failure. SPE (Single Piston Effect) and DPE (Double Piston Effect) refer to the seat sealing mechanisms. Combined with a built-in anti-static device, these features prevent static charge buildup that could ignite flammable media, ensuring maximum operational safety.
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What actuation options are available for this valve?
This valve supports multiple actuation methods including manual handwheel or gear operation, electric actuators, and pneumatic actuators. This flexibility allows it to be integrated into automated pipeline control systems or operated manually depending on the application requirements.
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What is the difference between full bore and reduced bore, and which should I choose?
A full bore (full port) valve has an internal diameter equal to the pipeline diameter, allowing unrestricted flow and easy pigging operations. A reduced bore valve has a smaller internal diameter, which can restrict flow slightly but is more compact and cost-effective. Full bore is recommended for applications requiring pigging, high flow capacity, or minimal pressure drop, while reduced bore suits general flow control applications.