Double Block & Bleed Valve – Flange x Flange – Ball Isolation with Needle Drain – 3/4” (DN 20) – Class 150 – ASME B16.34 / API 6D / ISO 17292
Block and Bleed Valve
Also known as:
DBB, Double Block and Bleed Valve
Double Block & Bleed Valve – Flange x Flange – Ball Isolation with Needle Drain – 3/4” (DN 20) – Class 150 – ASME B16.34 / API 6D / ISO 17292
Block and Bleed Valve
Also known as:
DBB, Double Block and Bleed ValveBuy
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The Double Block & Bleed Valve Flange x Flange with Ball isolation and Needle drain 3/4” is commonly selected for small to medium piping systems where space is limited and precise instrument or gauge isolation is required.Sign in
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Executive Summary
The Double Block & Bleed Valve Flange x Flange 3/4” (DN 20) with Ball isolation and Needle drain is used in oil and gas applications to provide dual isolation of process media and safe venting between valves. This configuration allows maintenance or instrument work downstream without shutting down the entire system. The valve is designed to reduce leak paths and system vibration, while providing compact installation and reliable operation
Technical Specifications
| Flange Size | 3/4” (DN 20) |
| Flange Class | 150 |
| Diameter | 100 mm |
| Diameter of Bolt Circle W | 69.9 mm |
| Number of Bolts | 4 |
| Diameter of Bolt Holes | 15.9 mm |
| Diameter of Bolts | 1/2” |
| Total Length | 203 mm |
| Bore Options | Reduced Bore, Full Bore |
| Standards Compliance | ASME B16.34 / API 6D / ISO 17292 |
Features and Benefits
- Ball isolation for both first and second valves.
- Compact design fits within existing piping layouts.
- Needle drain allows safe venting of trapped pressure.
- Provides reliable dual isolation for safety in oil and gas operations.
- 4-bolt configuration.
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Detailed Description
The Double Block & Bleed Valve Flange x Flange 3/4” (DN 20) with Ball isolation and Needle drain provides dual isolation in oil and gas piping systems. The first ball isolates upstream flow while the second ball isolates downstream flow. The needle drain vents trapped pressure between the two isolation points, making it suitable for instrument or gauge isolation, chemical injection, or sampling in operations where maintenance or measurement is required without interrupting the main process.
This specific 3/4” (DN 20) valve is rated for Class 150 service. It has a flange diameter of 100 mm, a bore of 69.9 mm, a flange thickness of 15.9 mm, and uses four bolts of 1/2” size. The face-to-face length is 203 mm. It is manufactured from materials compatible with oil and gas environments and meets ASME B16.34, API 6D, and ISO 17292 standards for pressure-temperature performance and reliability.
Engineering Data
