Ball Type Double Block and Bleed (DBB) Valve

Corrosion
Resistant

Leak Tight
Sealing

Automated
Operation

Low Maintenance
Long Life

Alis Valves offers high-performance Ball Type Double Block and Bleed Valve Manufacturer in India designed to provide double isolation and safe pressure venting in a single compact unit. These valves eliminate the need for multiple valves, reducing installation space and potential leakage points. Widely used in oil & gas, petrochemical, and high-pressure systems, DBB valves ensure maximum safety during maintenance and operation by isolating both upstream and downstream flow while allowing pressure bleed-off.

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Product Specifications and Overview

Ball Type

Floating / Trunnion Mounted

Size Range

DN 15 to DN 300

Pressure Rating

Class 150 to 1500

Body Material

Carbon Steel / Stainless Steel / Alloy Steel

Seat Material

PTFE / RPTFE / PEEK / Metal Seated

End Connection

Flanged / Butt Weld / Threaded

Operation

Lever / Gear / Pneumatic / Electric Actuated

Temperature Range

-46°C to 450°C (Depends on Material)

Media

Oil, Gas, Chemicals, Hydrocarbons

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Industries Served

Cement

Engineered valve solutions tailored for critical Cement operating processes.

Chemical

Engineered valve solutions tailored for critical Chemical operating processes.

Data centres

Engineered valve solutions tailored for critical Data centres operating processes.

Fertilizer

Engineered valve solutions tailored for critical Fertilizer operating processes.

Applications

Ammonia

High-performance flow automation engineered for Ammonia operations.

CO₂

High-performance flow automation engineered for CO₂ operations.

Compressed Air

High-performance flow automation engineered for Compressed Air operations.

Cryogenic

High-performance flow automation engineered for Cryogenic operations.

Frequently Ask Questions

What Is a Ball Type Double Block and Bleed Valve?

A Ball Type Double Block and Bleed (DBB) Valve is a valve arrangement that provides two separate isolation barriers and an intermediate bleed/vent point. This allows the upstream and downstream sections to be isolated while pressure trapped between the two barriers can be released.

Why Is Bleeding Important?

Bleeding the cavity between the two isolation barriers helps remove trapped process pressure and can provide an additional indication that the isolation barriers are functioning as intended.

What Is the Difference Between DBB and Double Isolation?

Double isolation refers to providing two isolation barriers. DBB adds a dedicated bleed/vent point between those barriers, allowing the intermediate cavity to be depressurized or monitored.

How Does a Ball DBB Valve Work?

The basic sequence is: Upstream ball closes. Downstream ball closes. The intermediate cavity is isolated from the process. The bleed/vent is opened. Trapped pressure is released. The bleed point can be monitored to verify isolation.

Is a DBB Valve Safer Than a Single Ball Valve?

For applications requiring double isolation and pressure verification, a DBB arrangement can provide a higher level of isolation assurance than relying on a single isolation valve. However, the appropriate isolation philosophy should always follow the project's safety requirements and applicable standards.

Who Is a Ball Type Double Block and Bleed Valve Manufacturer in India?

Alis Valves is a Ball Type Double Block and Bleed Valve manufacturer and supplier in India, offering DBB valve solutions for oil & gas, petrochemical, refinery, chemical, hydrocarbon and high-pressure process applications. The valves are available with floating or trunnion-mounted balls, multiple seat materials and manual or automated operation options.