Double Block & Bleed Valve – Flange x Thread – Ball x Ball 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

Double Block & Bleed Valve – Flange x Thread – Ball x Ball 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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6 - 8 Weeks

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Double Block and Bleed Valve with Flange x Thread connections and Ball x Ball isolation and Needle Drain is a compact valve for dual isolation and controlled venting in oil and gas instrument and process applications.

Executive Summary

The Double Block and Bleed Valve with Flange x Thread connections and Ball x Ball isolation with Needle Drain is used in oil and gas to provide secure dual isolation and controlled venting. It allows maintenance or instrumentation work downstream of the first isolation point without interrupting the process. The compact design reduces weight and space requirements and minimizes leak paths compared to separate valves. It is suitable for upstream, midstream, and downstream applications and meets recognized standards including ASME B16.34, API 6D, and ISO 17292.

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 Needle-Needle-Needle, Ball-Needle-Ball
Materials Available Stainless Steel, Duplex, Hastelloy, Inconel
NACE Compliance NACE MR-0-175 materials available on request
Testing Low Emission Standards
Ball Options Trunnion Ball, Floating Ball
Vent Valve Options Needle, Ball, Globe OS&Y

Features and Benefits

  • Needle drain valve allows controlled venting, sampling, or pressure release.
  • Blow-out proof stem ensures safe operation under high pressure.
  • Pressure ratings from Class 150 to 2500.
  • Compact design simplifies installation and system layout.
  • Minimizes potential hazards from trapped pressure between isolation points.

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Detailed Description

The Double Block and Bleed Valve with Flange x Thread connections and Ball x Ball isolation with Needle Drain is a compact assembly designed to provide dual isolation in oil and gas systems. The two ball valves ensure reliable upstream and downstream shutoff, while the needle drain allows controlled venting, sampling, or pressure release between the isolation points. This design reduces the number of flanged joints and potential leak paths, improving safety and reliability in instrument and process applications.

The valve is available in sizes from ½ inch to 2 inch and pressure classes from 150 to 2500, making it suitable for a wide range of process conditions. It can be manufactured in various materials including SS 316, SS 316L, Duplex, Super Duplex, Hastelloy, Inconel, and Monel, and can be supplied to meet NACE MR-01-75 requirements. The assembly is built to recognized standards including ASME B16.34, API 6D, and ISO 17292 and is tested to ensure proper operation, minimal leakage, and long service life.

This valve is ideal for instrument isolation, gauge protection, chemical injection, sampling connections, and other applications where safe and reliable dual isolation is required. Its compact and integrated design reduces installation complexity, simplifies system layout, and provides a safer and more efficient solution compared to assembling individual valves.

Engineering Data