Double Block & Bleed Valve – Flange x Flange – Ball Isolation with Needle Drain – 1/2” (DN 15) – 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 – 1/2” (DN 15) – 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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Double Block & Bleed Valve Flange x Flange 1/2” with Ball Isolation and Needle Drain provides dual shut-off and safe venting in compact oil and gas piping systems.Sign in
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Executive Summary
The 1/2” Double Block & Bleed Valve with Flange x Flange connections uses Ball valves for dual isolation and a Needle valve for venting. It is designed for compact piping systems where space is limited and safe, reliable isolation is required. This size is ideal for instrument connections, sampling points, and chemical injection in oil and gas applications.
The valve meets industry standards including ASME B16.34, API 6D, and ISO 17292. It offers a reduced footprint while maintaining the reliability and performance expected from larger valves, ensuring efficient operation in both onshore and offshore installations.
Its compact design minimizes leak paths and supports quick maintenance, making it suitable for instrument isolation, gauge isolation, and direct or remote mounting of instruments in high-pressure environments.
Technical Specifications
| Flange Size | 1/2” (DN 15) |
| Flange Class | 150 |
| Diameter | 90 mm |
| Diameter of Bolt Circle W | 60.3 mm |
| Number of Bolts | 4 |
| Diameter of Bolt Holes | 15.9 mm |
| Diameter of Bolts | 1/2” |
| Total Length | 200 mm |
| Bore Options | Reduced Bore, Full Bore |
| Standards Compliance | ASME B16.34 / API 6D / ISO 17292 |
Features and Benefits
- Can handle chemical injection, instrument drains, and gauge isolation.
- Space-saving and reduces stress from loading and vibration.
- Provides dual isolation in one assembly.
- Compact single-piece design.
- Needle drain for venting trapped pressure.
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Detailed Description
The Double Block & Bleed Valve with Flange x Flange connections and Ball x Ball isolation with Needle drain is designed to provide reliable dual isolation in oil and gas applications. This valve allows two points of isolation in a single assembly, reducing leak paths and ensuring safe maintenance downstream of the first isolation point. The integrated needle drain safely vents any trapped pressure between the two isolation valves.
This valve is available in flange sizes from 1/2” (DN 15) and can be used in applications requiring Class 150 ratings. Reduced and full bore options are offered to accommodate varying flow requirements. The design is suitable for direct or remote mounting of instruments, chemical injection connections, gauge isolation, instrument drains, and piping/instrument interfaces.
Manufactured in materials such as SS 316, SS 316L, Duplex, Super Duplex, Hastelloy, Inconel, and Monel, the valve can also meet NACE MR-0-175 requirements where corrosion resistance is necessary. The assembly conforms to recognized standards including ASME B16.34, API 6D, and ISO 17292. Its compact design allows easier installation in space-constrained environments while minimizing stress from loading or vibration.
This configuration is particularly useful in oil and gas operations where dual isolation is needed for maintenance, sampling, or chemical injection, providing a safe and efficient solution in instrument and piping systems.
Engineering Data
