Dual Seal Plug Valve DB&B API 6D
API 6D certified Double-Block & Bleed (DB&B) dual seal plug valves providing positive double isolation with a bleed port between two independent sealing surfaces — engineered for critical pipeline and process applications.
What Is a Dual Seal Plug Valve DB&B API 6D?
The Dual Seal Plug Valve DB&B API 6D is an advanced plug valve design incorporating two independent sealing surfaces (upstream and downstream seats) separated by a cavity that can be vented, drained, or tested via a dedicated bleed port — confirming positive double isolation and zero leakage to atmosphere. Meeting the rigorous API 6D pipeline valve standard, these valves are used in hydrocarbon pipelines, wellhead equipment, process plants, and chemical facilities where regulatory safety codes mandate proven double isolation and bleed capability to protect personnel and the environment.
Key Features
- ✔️ Double Block & Bleed (DB&B) Design - Provides positive upstream and downstream isolation with an integrated bleed function for maximum safety
- ✔️ Bubble-Tight Dual Sealing - Dual seal mechanism ensures reliable zero-leakage performance during operation and maintenance
- ✔️ API 6D Compliant - Manufactured in accordance with API 6D standards for demanding pipeline and industrial applications
- ✔️ Low Operating Torque - Optimized plug design enables smooth operation with manual, gear, pneumatic, or electric actuators
- ✔️ Heavy-Duty Industrial Construction - Designed for high-pressure oil & gas, petrochemical, refinery, and transmission pipeline services with long service life
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Technical Specifications
| Parameter | Details |
|---|---|
| Size Range | 1" - 24" (DN25 to DN600) |
| Pressure Class | Class 150 - 2500 (PN16 to PN420) |
| Temperature Range | -29°C to +200°C (Soft Seat); up to +400°C (Metal Seat) |
| Seating Type | Dual PTFE Soft Seat or Metal-to-Metal Seat with Sealant Injection |
| Lining Option | PTFE / PFA Full Lining Available for Corrosive Service |
| Body Materials | Carbon Steel (WCB/WC6), Stainless Steel (CF8M), Alloy Steel |
| End Connections | Flanged (ANSI RF/RTJ), Butt-Weld, Socket-Weld |
| Operation | Handwheel, Gear, Pneumatic Actuator (DA/SR), Electric Actuator |
| Design Standards | API 6D, ASME B16.34, API 608 |
| Testing Standards | API 6D Sec. 10, API 598 |
| Fire Safe Design | API 607 / ISO 10497 |
| Certifications | API 6D Monogram, CE, ISO 9001:2015, ATEX (optional) |
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