Double Block & Bleed Ball Valve
DBB design with two independent seating surfaces and a bleed valve for positive isolation and cavity venting in critical services.
Technical Specifications
| Type | Double Block & Bleed (DBB / DIB) |
| Size Range | 1/2" to 24" (15 mm to 600 mm) |
| Body Materials | Carbon Steel (WCB), SS316, Duplex, Super Duplex |
| Ball Material | SS316 / Inconel Overlay / Stellite |
| Seat Material | PTFE, RPTFE, Metal Seated |
| Stem Design | Blow-out proof, anti-static, fire-safe |
| End Connections | Flanged, Butt Weld |
| Pressure Rating | Class 150 / 300 / 600 / 900 / 1500 |
| Standards | API 6D,API 6FA,ISO 14313,ASME B16.34 |
| Lead Time | Ex-stock Gujarat: Same day | Standard items: 2–4 weeks | Exotic alloys: 8–12 weeks |
Applications
Oil & gas pipelines, metering skids, chemical plants, offshore
About the Double Block & Bleed Ball Valve
The Double Block and Bleed (DBB) ball valve integrates two independent seating surfaces - upstream and downstream - within a single compact valve body, together with a dedicated bleed port in the body cavity between the seats. When both seats are sealed against line pressure and the bleed valve is opened, any fluid trapped in the inter-seat cavity can be vented to atmosphere or a drain system. If the cavity remains pressurised after the bleed valve is opened, this immediately indicates a seat failure - making DBB an essential verification tool for safety-critical isolation. The DIB-1 (Double Isolation and Bleed) variant provides isolation from both pipeline directions simultaneously with a single body.
DBB ball valves replace what would conventionally require two separate block valves and one bleed valve - replacing three flanged connections with a single compact body. This reduces weight, face-to-face length, fugitive emission leak points, and overall cost significantly on metering skids, chemical injection headers, and pipeline pigging station manifolds. Vajra Industrial Solutions supplies DBB ball valves in sizes 1/2" to 24" to API 6D, with NACE MR0175 material traceability for sour gas service, Duplex and Super Duplex construction for offshore, and full fire-safe certification to API 6FA.
Where It's Used
Key industries and applications for the Double Block & Bleed Ball Valve
Fiscal metering skids
compact DBB ball valves replacing three-valve arrangements on upstream and downstream metering connections; mandatory API 6D DBB function for custody transfer stations where isolation integrity must be physically proven
Chemical injection and inhibitor dosing
SS316 or Duplex DBB valves on injection quill connections on gas pipelines; the bleed port allows safe removal of injection equipment without depressurising the pipeline
Pipeline pigging stations
WCB or LCC DBB ball valves at launcher and receiver end closures; full-bore through-conduit design passes pigs without obstruction; API 6D and API 6FA fire-safe certification standard
Offshore platform process manifolds
Super Duplex or Inconel trim DBB ball valves for sour crude, sour gas, and seawater injection; NACE MR0175 / ISO 15156 compliant; Class 600–1500 for high-pressure subsea riser base valves
Refinery process isolation
Class 300–600 WCB or SS316 DBB valves on heat exchanger shell and tube connections, reaction vessel nozzles, and pump isolation points where positive isolation must be proven before maintenance access
How to Choose the Right Double Block & Bleed Ball Valve
Specify a DBB ball valve when you need to (a) prove seat integrity without removing the valve from line, (b) replace three separate valves (2 block + 1 bleed) with one compact body to save space and weight, or (c) comply with API 6D or facility piping standards that mandate DBB at metering, injection, or pig trap connections. Choose DIB-1 configuration when the valve must block from both directions independently. Match NACE MR0175 material compliance for any sour gas (H2S) service.
Popular Configurations
Most commonly ordered specifications for the Double Block & Bleed Ball Valve
Frequently Asked Questions
About Double Block & Bleed Ball Valve - ordering, specs, delivery & compliance
What standards does the Double Block & Bleed Ball Valve comply with?+
Our Double Block & Bleed Ball Valve complies with API 6D, API 6FA, ISO 14313, ASME B16.34. All products are manufactured to international standards and come with full material test reports (MTR), dimensional inspection reports, and hydrostatic test certificates on request.
What materials are available for the Double Block & Bleed Ball Valve?+
The Double Block & Bleed Ball Valve is available in Carbon Steel (WCB), SS316, Duplex, Super Duplex. Material selection depends on your process fluid, temperature, pressure, and corrosion requirements.
What is the delivery lead time for Double Block & Bleed Ball Valve?+
Standard stock sizes are available for immediate dispatch from our Vadodara warehouse. Custom sizes and special materials typically have a lead time of 2–6 weeks depending on specifications. We serve customers across India within 1–7 business days and export to the Middle East, Southeast Asia, Europe, and the Americas with full export documentation.
Can I get a custom Double Block & Bleed Ball Valve for a specific application?+
Yes. Vajra Industrial Solutions supplies custom-engineered ball valves for specific process conditions. Submit your technical requirements - including pressure class, temperature range, fluid type, end connections, and any special trim or coating needs - via our RFQ form or WhatsApp, and our engineering team will respond within 24 hours.
What pressure ratings are available for the Double Block & Bleed Ball Valve?+
The Double Block & Bleed Ball Valve is available in pressure ratings of Class 150 / 300 / 600 / 900 / 1500. Higher-pressure classes are available for critical service applications in oil & gas, power generation, and chemical processing.
How do I request a quote for the Double Block & Bleed Ball Valve?+
You can request a quote by clicking the "Request Quote" button on this page, filling out our RFQ form at vajravyuh.com/rfq, emailing us at sales@vajravyuh.com, or WhatsApping us directly at +91-9979774557. Please include quantity, size, pressure class, material grade, and end-connection type for the fastest response.
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