Product Overview
Our non-lubricated Double Block & Bleed (DBB) valve integrates two independent sealing barriers and a central bleed port within a single, compact body. This engineered design allows operators to achieve positive, verifiable isolation of pipeline sections before critical maintenance.
Unlike traditional lubricated plug valves, our design utilizes advanced, high-precision mechanical sealing geometry and self-lubricating seat materials. This completely eliminates the need for sealant injection systems, preventing process contamination and minimizing total cost of ownership.
Key Features
Reliable Double Isolation
Two fully independent sealing surfaces deliver bubble-tight shutoff, maintaining severe-service isolation even under upstream pressure fluctuations.
Certified Fire-Safe Design
Engineered and tested to maintain sealing integrity under extreme fire exposure, fully compliant with API 607 and ISO 10497 international safety standards.
Fugitive Emission Control
Equipped with an advanced stem sealing system that meets strict environmental regulations (ISO 15848-1 / API 622), effectively reducing hazardous fugitive emissions.
Premium Corrosion Resistance
Available in high-grade stainless steel 316/316L, CF8M, Duplex, and Super Duplex to withstand aggressive media and harsh marine environments.
Low Operating Torque
Optimized internal geometry reduces mechanical friction and lowers actuation force by up to 20%, allowing for smaller, more cost-effective actuator selection.
Maintenance-Free Operation
The grease-free, self-sealing system eliminates the risk of sealant washouts, preventing product contamination and reducing plant downtime.
Technical Specifications
|
Parameter |
Details |
|
Product Type |
Non-Lubricated Double Block & Bleed Valve |
|
Size Range |
1/2" – 24" (DN15 – DN600) |
|
Pressure Class |
ASME Class 150 – 2500 |
|
Body Material |
ASTM A351 CF8 / CF8M / CF3M / Duplex / Super Duplex |
|
Seat Material |
PTFE / RPTFE / PEEK / Metal-to-Metal Seat |
|
End Connection |
Flanged (RF, RTJ) / Threaded / Butt-Weld (BW) / Socket-Weld (SW) |
|
Temperature Range |
-196°C to +540°C (Cryogenic to High-Temperature Service) |
|
Actuation |
Manual Lever / Gear Operator / Pneumatic / Electric Actuator |
|
Testing Standard |
API 598 / ISO 5208 |
|
Design Standard |
API 6D / API 608 / ASME B16.34 |
|
Leakage Class |
Rate A (Bubble-tight shutoff) |
Why Choose Us
Years of Expertise: Specialized valve manufacturer with a proven global track record in over 50 countries.
100% Quality Assured: Every single valve undergoes hydrostatic and pneumatic pressure testing per API 598 prior to dispatch.
Full Traceability: Mill Test Certificates (MTC) matching EN 10204 3.1 are provided for full material traceability.
Custom Engineering (OEM/ODM): Tailored valve geometries, specific alloy configurations, and custom actuations available.
Rapid Technical Support: Dedicated engineering team providing comprehensive technical responses and quotations within 24 hours.
Packaging & Shipping
To ensure pristine condition upon arrival, all valves are packed in export-grade, IPPC-compliant plywood cases featuring:
VCI anti-corrosion barrier protection.
Heavy-duty internal structural fixation.
Clear shipping marks, part numbers, and project-specific tagging for easy on-site traceability.
Shipping configurations are flexible, offering Sea Freight, Air Freight, or Express Delivery depending on your project schedule.
FAQ
Q: How does this design differ from traditional lubricated plug valves?
A: Lubricated valves require continuous grease injection to maintain tight seals. Non-lubricated DBB valves rely entirely on precision mechanical seating, reducing operational costs and preventing seal failure from grease washout.
Q: Can these valves handle high-pressure and high-temperature applications?
A: Yes. Our valves are fully rated from ASME Class 150 up to Class 2500, with an operational temperature range stretching from -196°C (cryogenic) up to +540°C.
Q: Are your DBB valves suitable for hydrogen service?
A: Yes. We offer specialized configurations with low-emission stem seals (ISO 15848-1) and high-purity, embrittlement-resistant alloys specifically cleaned and tested for hydrogen applications.
Q: What design and manufacturing standards do you comply with?
A: Our valves are designed, manufactured, and tested in strict accordance with international standards, including API 6D, API 608, ASME B16.34, API 598, and ISO 5208.
Q: Can you provide custom valve designs for specific projects?
A: Yes. We have full OEM and custom engineering capabilities to modify dimensions, pressure ratings, materials, and actuation packages based on your precise piping layouts.
Q: What is your standard production lead time?
A: Standard materials typically ship within 2 to 6 weeks. For custom engineering or exotic alloys (such as Super Duplex), a precise delivery timeline will be detailed in your quotation.
Q: Do you provide material and testing documentation?
A: Yes. Every shipment includes comprehensive documentation, including EN 10204 3.1 Mill Test Certificates, pressure test reports, and compliance certificates.
Q: What is the warranty period for your valves?
A: We offer a standard commercial warranty of 12 months from the date of installation or 18 months from the date of shipment, whichever occurs first.
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