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Double Block Bleed Valve (DBB)

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MOQ : 5 Units

Double Block Bleed Valve (DBB) Specification

Channels
Double Isolation, Single Bleed

Structure
Double Block & Bleed (DBB)

Connection
Flanged / Threaded / Socket Weld

Pressure
Class 150 Class 2500

Caliber
Full Bore / Reduced Bore

Material
Stainless Steel / Carbon Steel / Alloy Steel

Power
Manual / Hydraulic / Pneumatic

Media
Oil, Gas, Water, Chemical

Temperature of Media
-20C to 220C

Port Size
1/2 to 4 (DN15 DN100)

Flange
ANSI, DIN, JIS, Custom

Finish
Polished / Coated

Application
Oil & Gas, Petrochemical, Power Plants, Instrumentation

Locking Device
Optional

Testing
Hydrostatic & Pneumatic Tested

Operation
Lever / Gear / Actuator

End Connection Type
Screwed, Flanged, Socket Weld, Butt Weld

Fire Safe Design
Yes, API 607/ISO 10497

Bleed Valve Type
Needle Valve

Leakage Class
ASME Class VI

Body Material Grade
A105, F316, F304, LF2, Duplex, Super Duplex

Face to Face Dimension
As per ASME B16.10

Anti-Static Device
Provided

Weight
Depends on size and rating

Standards
API 6D / ASME B16.34 / BS 5351

Seat Type
Soft Seated / Metal Seated

Body Type
3-Piece, Forged, Bar Stock

Double Block Bleed Valve (DBB) Trade Information

Minimum Order Quantity
5 Units

Supply Ability
200 Units Per Month

Delivery Time
7 Days

About Double Block Bleed Valve (DBB)

Double Block Bleed Valve (DBB)

Size	2" to 56" (50 mm to 1400 mm)
ASME Class	Class 150 to 2500
Design Standard	API 6D

Main Feature :

· Trunnion-mounted Ball Valve design complies to API 6D

· Wide portfolio of Side-entry and Top-entry designs

· Fugitive emissions

· Soft and Metal seated valves complies to ISO 15848-1, Class AH and BH

· Fire safe design - to API 607 and API 6FACE Marking

· Meets requirements of Pressure Equipment Directive 2014/68/EU,

· Pneumatic shell test conducted at 1.1 times rated pressure to check shell integrity, when required · Double block and bleed (DBB) feature

· Valves are designed and tested for automatic cavity relief

· Anti-blowout stem design

· Coil springs used for consistent seat loading and lower operating torque

· Lip seals provided for low temperature services

· Primary O ring and Secondary graphite (in 3 stage stem, thrust washer is primary)

· Wide portfolio of Side-entry and Top-entry designs

· Options: Buried service, Cryogenic

· Offered with Electric, Pneumatic and Hydraulic Actuators

· In-house Tests Capabilities

Versatile End Connections & Body Types

The DBB valve can be tailored to diverse project needs with options like flanged, screwed, socket weld, and butt weld ends. Body styles include 3-piece, forged, and bar stock construction. These variants cater to differing installation processes and application pressures, enhancing adaptability across industries.

Advanced Safety Features & Certifications

Designed for maximum safety, the DBB valve incorporates a fire-safe construction in line with API 607/ISO 10497 standards. It also features an anti-static device, optional locking mechanism, and meets leakage requirements under ASME Class VI. All valves are hydrostatically and pneumatically tested before dispatch.

Customizable Specifications for Demanding Environments

With port sizes ranging from 1/2" to 4" (DN15-DN100) and materials such as stainless steel, carbon steel, alloy steel, and duplex varieties, the DBB valve suits both standard and custom process requirements. Polished or coated finishes and full or reduced bore calibers are available, supporting operational temperatures from -20C to 220C.

FAQ's of Double Block Bleed Valve (DBB):

Q: How is the Double Block Bleed Valve tested before shipment?

A: Each DBB valve undergoes thorough hydrostatic and pneumatic testing to ensure it meets both strength and leak-proof performance criteria, complying with applicable API 6D and ASME standards.

Q: What are the available end connection types for these valves?

A: Double Block Bleed Valves can be supplied with screwed, flanged, socket weld, and butt weld ends, making them suitable for a variety of piping configurations and international flange standards such as ANSI, DIN, JIS, or custom specifications.

Q: When should I use a needle-type bleed valve in a DBB assembly?

A: Needle-type bleed valves are recommended when precise control and minimal leakage are essential during maintenance or system integrity checks, particularly in oil & gas and chemical process applications.

Q: Where can Double Block Bleed Valves be applied?

A: These valves are widely used in oil & gas, petrochemical, power generation, instrumentation, and process plants where reliable isolation and bleed capability are critical for safety and maintenance.

Q: What is the process for selecting the correct body material grade?

A: Selection depends on the media, pressure, temperature, and corrosion resistance required. Common grades include A105 for general use, F316 and F304 for enhanced corrosion resistance, LF2 for low temperature, and Duplex/Super Duplex for extreme environments.

Q: How does fire-safe design benefit operational safety?

A: A fire-safe DBB valve ensures the valve maintains its sealing ability during and after exposure to high temperatures or fire conditions, reducing the risk of leaks and ensuring process security, as verified by API 607/ISO 10497 certification.

Q: What are the main advantages of using a Double Block Bleed Valve?

A: DBB valves provide dual isolation with a single bleed, improve safety during maintenance, minimize downtime, meet stringent leakage (ASME Class VI) requirements, and conform to leading international standards for reliability and versatility.

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