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Plug Valve

Double Block and Bleed

A DBB (Double Block and Bleed) Plug Valve is a type of valve that incorporates two seating surfaces to achieve positive isolation of fluid flow in a pipeline.


Plug Valve - Double Block and Bleed
Size Range

2 – 24 NPS, DN50 - DN600

Body Materials

ASTM A216, A105, A350, A182, A351, A352, A890, A995.

Temperature Range

-29°C to 450°C

Plug Materials

ASTM A216, A105, A350, A182, A351, A352, A890, A995.

Maximum Allowable Operating Pressure

ANSI 150#, ANSI 300#, ANSI 600# , ANSI 900#, ANSI 1500#, ANSI 2500#

Seat Materials

PTFE, NYLON, PEEK, NBR, KELF, ENP (Electroless nickel plating), HC (Hard chrome).

Shutoff Rating

Bidirectional Bubble-tight

Body Style

Flanged End, Butt Weld, FE V/s BW

Design Standard

API 6D, ASME 16.34

Flange Drilling

ASME B16.5

Testing Standard

API 598, ISO 5208, EN 12266-1

Face To Face

ASME B16.10


Oil & Gas, Wastewater, Seawater, Petrochemicals

Features & Benefits :
    • Double Block and Bleed Functionality: DBB plug valves are designed to provide double block and bleed capability in a single valve body. This means they can block flow from both upstream and downstream directions simultaneously, isolating the section of the pipeline between them. Additionally, they typically include a bleed port between the two sealing surfaces to safely vent or bleed off any trapped fluid or pressure downstream of the valve.

    • Compact Design: Compared to using separate valves for isolation and bleed purposes, DBB plug valves offer a more compact solution. They reduce the number of valves and connections required in a pipeline system, thereby saving space, installation costs, and potential leakage points.

    • Reliable Sealing: These valves utilize a plug with sealing surfaces that provide reliable shutoff against fluid flow. The seating surfaces are often designed to withstand high pressures and temperatures, ensuring tight sealing to prevent leakage.

    • Versatility: DBB plug valves are suitable for a wide range of applications across various industries, including oil and gas, petrochemical, chemical processing, power generation, and more. They can handle different types of fluids, including corrosive and abrasive media.

    • Safety and Environmental Protection: By effectively blocking fluid flow in both directions and incorporating a bleed port, DBB plug valves enhance safety by reducing the risk of accidental release of hazardous fluids into the environment. They help in complying with environmental regulations and maintaining a safe working environment.

    • Ease of Maintenance: Like other plug valves, DBB plug valves are designed for ease of maintenance. They often feature accessible plug and seat arrangements that allow for quick inspection, repair, or replacement without removing the valve from the pipeline.

    • Long Service Life: Constructed from durable materials such as stainless steel, carbon steel, or special alloys, DBB plug valves are engineered for long-term reliability and resistance to wear and corrosion.

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