Product Overview
Non-Lubricated soft seat DBB plug valve operates on a precise quarter-turn rotary motion. The tapered or cylindrical plug rotates smoothly inside a premium polymer-lined sleeve. This design achieves a bubble-tight, positive shut-off without the need for sealant injection, ensuring a clean and continuous seal.
Key Features & Benefits
Maintenance-Free Design: Non-lubricated construction eliminates periodic grease injection, reducing operational costs and environmental risks.
True Double Block and Bleed (DBB): Provides two independent isolation barriers with a reliable venting system in a single valve body.
Cavity-Free Structure: Prevents media accumulation and solids retention, making it perfect for dirty, corrosive, or slurry applications.
Zero Leakage Performance: Bi-directional, bubble-tight sealing utilizing advanced soft sleeve materials.
Enhanced Safety Features: Built-in anti-static, anti-blowout stem design, and fire-safe integrity.
Low Operating Torque: Optimizes actuator sizing, leading to lower automation costs.
Technical Specifications
|
Item |
Specification |
|
Product Type |
Non-Lubricated Soft Seat DBB Plug Valve |
|
Design Standard |
API 599 / API 6D |
|
Testing Standard |
API 598 |
|
Fire-Safe Standard |
API 607 / ISO 10497 (Available upon request) |
|
Pressure Class |
ASME Class 150 / 300 / 600 / 900 (Up to Class 2500 optional) |
|
Size Range |
1/2" – 36" (DN15 – DN900) |
|
Body Material |
WCB, LCB, CF8, CF8M, Duplex SS, Alloy Steel |
|
Plug Material |
Stainless Steel / Coated Alloy Steel |
|
Sleeve/Seat Material |
PTFE / RPTFE / TFM (Sourced from global premium brands) |
|
End Connections |
RF / RTJ / BW / Flanged |
|
Temperature Range |
-46°C to +200°C (Depending on seat material selection) |
|
Operation |
Lever, Gear, Pneumatic, Electric |
Structural Design & Material Reliability
Our engineering team utilizes advanced finite element analysis (FEA) to optimize the soft sleeve sealing system. By eliminating metal-to-metal friction, we drastically reduce wear and extend the valve's service life.
Main Components:
High-integrity valve body (cast or forged)
Precision-machined tapered or cylindrical plug
Heavy-duty PTFE-based soft sealing sleeve
Blowout-proof stem with secondary fire-safe sealing graphitic packing
Standardized top-flange for easy actuator mounting (ISO 5211)
Typical Applications
This DBB plug valve is widely deployed worldwide across critical sectors requiring absolute isolation:
Oil & Gas transmission pipelines and metering stations
Petrochemical and refinery processing plants
Chemical processing industries (severe or corrosive media)
LNG terminals, storage, and regasification facilities
Offshore platforms and FPSO modules
Power generation and industrial water treatment systems
Manufacturing, Quality Control & Traceability
As a quality-driven manufacturer, every valve goes through a rigorous quality assurance program before leaving our facility to guarantee field reliability.
100% Pressure Testing: Every single valve undergoes hydrostatic and pneumatic testing strictly per API 598. Pressure-holding charts can be provided for major projects.
Material Traceability: Full material traceability is guaranteed. Mill Test Certificates (MTC) according to EN 10204 3.1 are supplied with every shipment (EN 10204 3.2 available for third-party inspection).
Non-Destructive Testing (NDT): Radiographic (RT), Ultrasonic (UT), Magnetic Particle (MT), and Dye Penetrant (PT) testing are performed based on project specifications.
Third-Party Inspection: We welcome international inspection agencies such as SGS, BV, TUV, or DNV to witness testing.
Why Choose Us
Compared to traditional lubricated plug valves that require constant field maintenance, our non-lubricated DBB solution offers a massive total cost of ownership (TCO) advantage:
Lower O&M Costs: No sealant grease required, saving hours of manual maintenance and product downtime.
Zero Contamination: Ideal for high-purity applications where grease would ruin the downstream media.
Engineering & OEM Flexibility: We offer tailored face-to-face dimensions, custom metallurgy, and complete automated valve packages (valve + actuator + accessories).
Reliable Global Supply Chain: Strict adherence to lead times with robust export packaging (sea-worthy plywood cases) to ensure safe arrival at your job site.
FAQ
Q: Can you provide customized face-to-face dimensions or special alloy materials for corrosive offshore applications?
A: Yes. While we manufacture standard dimensions according to API 6D, our engineering team can customize dimensions to fit your existing pipeline footprint. We also offer specialized materials like Duplex Stainless Steel, Super Duplex, and Monel for highly corrosive or offshore environments.
Q: How do you guarantee "Zero Leakage" before the valves leave the factory?
A: Every valve is subjected to high-pressure hydrostatic shell and seat tests, as well as low-pressure pneumatic seat tests in strict accordance with API 598. We do not spot-check; 100% of our valves must achieve zero visible leakage (bubble-tight) before they are approved for packing.
Q: Do your valves come with full material certifications?
A: Absolutely. All shipments include detailed Mill Test Certificates (MTC) compliant with EN 10204 3.1, detailing the chemical composition and mechanical properties of the pressure-containing parts. If your project requires EN 10204 3.2, we can coordinate with third-party inspectors like SGS or BV.
Q: Are these valves fire-safe certified for hazardous environments?
A: Yes, we offer fire-safe designs certified to API 607 and ISO 10497 standards. These designs utilize secondary graphite sealing elements that ensure tight isolation even if the primary soft PTFE sleeve is destroyed in a fire.
Q: What is your typical lead time for international project orders?
A: Lead times vary based on the valve size, pressure class, and material availability. Standard material valves (like WCB or CF8M) in common sizes are often available on accelerated schedules, while custom alloys or large bulk orders typically range from 4 to 8 weeks. Contact our sales team with your specific Bill of Materials (BOM) for an exact quotation and production timeline.
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