Monoflange DBB Double Block & Bleed Valve – Flange x Thread – OS&Y and Needle Isolation with Needle Drain – 1/2” to 2” – Class 150 to 2500 – ASME B16.34 / API 6D / ISO 17292

Block and Bleed Valve

Also known as:

DBB, Double Block and Bleed Valve

Monoflange DBB Double Block & Bleed Valve – Flange x Thread – OS&Y and Needle Isolation with Needle Drain – 1/2” to 2” – Class 150 to 2500 – ASME B16.34 / API 6D / ISO 17292

Block and Bleed Valve

Also known as:

DBB, Double Block and Bleed Valve

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Delivery Time:

6 - 8 Weeks

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The Monoflange DBB Double Block & Bleed Valve Flange x Thread with OS&Y and Needle Isolation is a compact valve for dual isolation and safe venting in oil and gas systems.

Executive Summary

The Monoflange DBB Double Block & Bleed Valve Flange x Thread with OS&Y and Needle Isolation provides dual isolation and controlled venting in oil and gas systems. It combines two isolation valves and a drain in a single compact assembly, reducing leak points and simplifying installation compared to using multiple separate valves. This design is well suited for instrument and gauge isolation, chemical injection points, and other applications where reliable isolation and safe depressurization are required.

Technical Specifications

Flange Size Range 1/2” to 2”
Pressure Rating Class 150 to Class 2500
Bore Options Reduced Bore, Full Bore
Standards Compliance EEMUA 182, API 6D, ISO 17292, ASME B16.34
Configurations Ball Isolation with Needle Drain
Materials Available Stainless Steel, Duplex, Hastelloy, Inconel
NACE Compliance NACE MR-0-175 materials available on request
Testing Low Emission Standards
Ball Options Floating Ball
Vent Valve Options Needle

Features and Benefits

  • Integrated needle drain for controlled venting.
  • Dual isolation in a single Monoflange assembly.
  • Simplifies installation by replacing multiple valves.
  • Supports high-pressure oil and gas applications.
  • Flexible mounting for direct or remote instrumentation.

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Detailed Description

The Monoflange DBB Double Block & Bleed Valve Flange x Thread with OS&Y and Needle Isolation is designed to provide reliable dual isolation with a controlled bleed in a single assembly. This configuration replaces the need for multiple individual valves, reducing the number of potential leak points and simplifying installation in oil and gas applications. The first isolation is achieved using an OS&Y valve, while the second isolation and the drain function use a needle valve, providing precise control over fluid venting and depressurization.

This valve is suitable for instrument and gauge isolation, chemical injection points, sampling connections, and direct or remote mounting of instruments. It supports high-pressure systems with a range from Class 150 to Class 2500, and accommodates both reduced and full bore options. Constructed from durable materials including SS 316, SS 316L, Duplex, Super Duplex, Hastelloy, Inconel, and Monel, the valve can also be supplied with NACE-compliant materials on request.

Manufactured in accordance with recognized standards such as ASME B16.34, API 6D, and ISO 17292, the Monoflange DBB provides a compact, robust solution for dual isolation with reliable venting. Its integrated design reduces stress on piping systems, minimizes maintenance needs, and ensures consistent performance in critical oil and gas applications.

Engineering Data