Product Overview
The Carbon Steel Soft Seat Double Block and Bleed (DBB) Plug Valve is engineered for high-integrity, bubble-tight shutoff in critical industrial piping systems. Utilizing a quarter-turn plug mechanism with resilient soft seats, this valve delivers dependable dual-sealing performance while minimizing operating torque and maintenance overhead. The advanced DBB design features two independent sealing surfaces combined with an intermediate bleed cavity. This configuration allows operators to safely isolate upstream and downstream process media and verify seal integrity before initiating downstream maintenance, significantly mitigating leakage risks and elevating operational safety.
Key Features
Bubble-Tight Soft Seat Sealing: Resilient soft seats achieve zero visible leakage under standard operating conditions. It is ideal for clean fluids, natural gas, refined petroleum products, and non-abrasive process media.
True Double Block & Bleed Function: Dual independent seals isolate pressure from both ends, while the integrated bleed port verifies complete isolation to maximize field safety and prevent product loss.
Low Operating Torque: The lower-friction soft seat design ensures smooth quarter-turn operation, allowing for smaller, more cost-effective actuator selections compared to conventional metal-seated valves.
Rugged Carbon Steel Construction: Cast from high-grade ASTM A216 WCB carbon steel, the valve body provides exceptional mechanical strength, impact resistance, and long-term durability in medium-to-high pressure applications.
Fire-Safe & Anti-Static Design: Engineered to meet hazardous environment requirements, optional fire-safe construction and anti-static devices enhance safety in modern oil and gas facilities.
Streamlined Maintenance: The simple, robust plug valve structure allows for straightforward inspection, quick replacement of inline sealing components, and minimized system downtime.
Technical Specifications
|
Item |
Specification |
|
Valve Type |
Double Block & Bleed (DBB) Plug Valve |
|
Body Material |
ASTM A216 WCB, ASTM A352 LCB, ASTM A217 WC6 |
|
Seat Material |
PTFE, RPTFE, PEEK, Devlon |
|
Pressure Rating |
Class 150 – Class 900 |
|
Size Range |
2" – 24" (DN50 – DN600) |
|
End Connection |
RF (Raised Face), RTJ (Ring Type Joint), Butt Weld |
|
Operation |
Lever, Gear, Pneumatic Actuator, Electric Actuator |
|
Temperature Range |
-29°C to +180°C (Subject to seat material selection) |
|
Leakage Standard |
API 598 / ISO 5208 |
|
Design Standard |
API 6D / API 599 |
|
Face-to-Face |
ASME B16.10 |
|
Flange Standard |
ASME B16.5 |
Material Options & Configurations
To accommodate diverse operating environments and corrosive media, we offer tailored material combinations:
Body Materials: ASTM A216 WCB, ASTM A352 LCB (Low Temperature), ASTM A217 WC6.
Seat Materials: PTFE, Reinforced PTFE (RPTFE), PEEK, Devlon.
Stem Materials: Stainless Steel 410, Stainless Steel 316, Duplex Stainless Steel.
Sour Service: Full compliance with NACE MR0175 / ISO 15156 is available for sour gas and crude environments.
Quality Certifications
Every valve is manufactured, inspected, and documented in strict compliance with international industry benchmarks:
Design & Manufacturing: API 6D, API 599, ASME B16.34
Dimensions & Flanges: ASME B16.10, ASME B16.5
Testing & Inspection: API 598, ISO 5208
Quality Management: ISO 9001 System
Fire Safety: API 607 Certified (Optional)
Quality Assurance Guarantee: Prior to dispatch, 100% of our valves undergo rigorous hydrostatic shell testing, seat leakage testing, torque testing, and dimensional verification. We provide complete EN 10204 3.1 Material Certificates and pressure test reports. Third-party inspections by SGS, BV, or TÜV are fully welcomed upon project request.
Typical Applications
Our DBB Plug Valves are widely deployed across critical global infrastructure projects where failure-free isolation is non-negotiable.
With proven performance in high-pressure gas transport and sour service environments across the Middle East, Southeast Asia, and the Americas, these valves are trusted in:
- Oil & Gas Transmission Pipelines & Offshore Platforms
- Refineries & Tank Farms (Custody Transfer and Metering Stations)
- Petrochemical & Chemical Processing Facilities
- LNG Storage, Regasification, and Transportation
- Power Generation & Industrial Utility Systems
How to Select the Right DBB Plug Valve
Selecting the optimal valve configuration depends on your specific pipeline criteria:
Size & Rating: Define your pipeline size and required ASME pressure class.
Media & Temperature: Match the chemical composition and temperature of your process media with the appropriate seat material (e.g., PEEK for higher temperatures, Devlon for high-pressure durability).
Environmental Compliance: Specify if NACE MR0175 materials are required for sour service.
Automation: Choose between manual lever/gear operation or integrated pneumatic/electric actuators for remote control systems.
FAQ
Q: What is the primary operational advantage of a DBB Plug Valve?
A: A DBB valve replaces the traditional method of installing two separate valves with a spool piece. It provides two independent sealing barriers and a bleed port in a single body, saving space, reducing potential leak paths, and allowing operators to safely verify seal integrity during line maintenance.
Q: Are soft-seated DBB plug valves suitable for high-pressure systems?
A: Yes. By utilizing advanced engineering plastics like RPTFE, PEEK, or Devlon, our soft-seated DBB plug valves perform reliably up to Class 900 applications within their designated temperature thresholds.
Q: Can you provide 2D/3D CAD drawings for piping design verification?
A: Absolutely. We support project engineers by providing detailed GA (General Arrangement) drawings and 3D CAD models to ensure seamless integration into your piping layouts.
Q: What is the typical lead time for a standard order?
A: For standard materials such as ASTM A216 WCB bodies in common sizes (2" to 8" Class 150/300), we maintain a semi-finished stock component inventory, enabling a rapid lead time of 4 to 6 weeks. Custom alloy fabrications or large-diameter valves are scheduled based on project requirements.
Q: What documentation is provided with the shipment?
A: Every shipment includes a comprehensive quality dossier: EN 10204 3.1 Material Test Certificates (MTC), hydrostatic and pneumatic pressure test reports, dimensional inspection reports, and a detailed Installation, Operation, and Maintenance (IOM) Manual.
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