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Double Block and Bleed Ball Valve

Double-block-and-bleed ball valves (DBB ball valves) allow for a pipe section to be shut down from both sides of the valve. This design feature keeps everyone safe from accidental leaks that can cause harm, making it efficient for the oil and gas industry. Along with strong security features, our valves reduce the need for added valves and save both on space and costs.

To achieve our results, we design the valve thoroughly in our facilities. In maximizing our efficiency, we use a comprehensive range of manufacturing and testing equipment that detects defects early on and ensures faster performance.

Highlights

  • Full Port or Reduced Port
  • Blow-out Proof Stem
  • Fire Safe Tested Design
  • Anti-static Design
  • ISO5211 Mount Pad
  • Double Block and Bleed
  • Cavity Pressure Relief
  • Low Emission Certified
  • Low Torque Performance
  • Secure Line Flow Locking Device

Main Features of the Product

  • DBB VALVE can be designed in three-piece, long or short pattern to satisfy the different installation requirements
  • The valve meets NACE standard, fugitive emission function and fire test certification of API Spec 607
  • DBB compact manifold ball valve design reduces the weight and space compared with installing two conventional valves when it achieves safer application
  • Locking devices standard on lever operated valves
  • All valves have self cavity pressure relief function to ensure the safety of the pressure in the middle chamber
  • API 622 certified live loading of packing makes valve stem sealing safer

Technical Specifications

Size Range Body Materials
1/2″-24″(15mm-600mm) Carbon Steel,Stainless Steel,Copper Alloy,alloy steel,etc
Temperature Range Stem Material
-196 to 400 degree Staniless Steel
Pressure Ratings Shutoff Rating
Class 150 to Class 2500,PN 2.5 to PN420,10K-20K Zero Leakage
Ball Materials Body Style
Carbon Steel,Stainless Steel,Copper Alloy,alloy steel,etc Double Flanged,Butt Weld,NPT,SW
Design Standard Flange Drilling
API608,API 6D,EN1983,ISO17292,GOST ASME B16.5, EN 1092-1,GOST 33259
Testing Standard Certifications
API 598,EN12266-1,ISO 5208 API 6D,CE,EAC,SIL3,ISO 19001,API 607,API 6FA
Face to Face Fugitive Emissions
API 6D,ISO 5752,ASME B16.10,EN558-1 ISO 158484-1
Applications Operation
Marine and offshore industry Wench, Worm Gear, Electric, Pneumatic,etc
Seat Materials
PTFE,RPTFE,PCTFE,NYLON,DEVLON,PEEK,etc(Soft Seat) Coating STL,TCC,NI55,NI60,etc(Metal Seat)

What is a Block and Bleed Ball Valve?

The block and bleed ball valve is a device designed to replace several connections between conventional valves. Unlike industrial ball valves, these valves can effectively overcome leakage that occurs during system operations. Its ability to release and close quickly attributes to its efficient performance.

This DBB ball valve consists of two seating surfaces in an enclosed position that provides a seal against pressure from both ends of the valve. Featuring two block valves and one bleed valve, there is facilitated bleeding between the cavities of the seated surfaces. 

Double Block and Bleed Ball Valve

Advantages of DBB Ball Valve

Below are some of the advantages of the double block and bleed ball valves

  • Using two ball valves, extra safety and reliability is assured.
  • Reduced installation space.
  • Safe working environment is guaranteed.
  • Designed to replace multiple connections between traditional valves.
  • Saves installation time.
  • Pressure problems in the product system are eliminated.
  • Cost-effective.
  • Simple structure with ease of operation.
  • Can be used in many industries like oil and gas, petrochemical, marine, etc.

Disadvantages of DBB Ball Valve

The double block and bleed ball valve also has some shortcomings. Below are a few listed. 

  • Not useful in services that require throttling.
  • Increased risk of wear, leakages, and valve failure.
  • Increases the occurrence of surge pressure which may be harmful to downstream equipment.

Applications of Double Block and Bleed Ball Valve

At China valve supplier Dombor, our double block and bleed ball valve and the trunnion ball valve are useful in oil and gas, pipeline and many other industries. Also, they come in handy in other areas like:

  • Prevention of product contamination.
  • Removal of equipment from service for repair.
  • Meter calibration.
  • Storage and transmission. 
  • Chemical injection and testing.
  • Water treatment near waterways.
  • Primary process steam.
  • Measuring instrument for shut off and vent pressure.
Applications of Double Block and Bleed Ball Valve

Types of Block and Bleed Valves

Being a first class block and bleed ball valve and v-port ball valve manufacturer, we are experts in the production of two major types of block and bleed valves namely single block and bleed valve and double block and bleed valves.

Single Block and Bleed Valves

Single Block and Bleed Valve2

Single block and bleed valves can also be called the ‘isolation valve system’ made up of one block valve and one bleed valve. They are commonly used in non-critical process services like non-hydrocarbon and non-hazardous process fluids.

Double Block and Bleed Valve

Double Block and Bleed Ball Valve

Similar to having three valves in one, the double block and bleed valves are made up of two block valves and one bleed valve. Its two seating surfaces help provide a seal against pressure at both ends of the valve.

Double Block and Bleed Ball Valve 2

Components of the Double Block and Bleed Ball Valve

Some components of the double block and bleed ball valve are:

  • Valve Body: Routing of the transmission of media through the valve is controlled by the valve body.
  • Stem: The valve stem is solely responsible for the proper positioning of the disk.
  • Seats: Moving components of the valve rest in the seats when it is at its closed position.
  • Bonnet: Openings on the top of the valve body are covered by the bonnet. As a result, it serves as the pressure-retaining part of the valve.

How does a DBB Ball Valve Work?

The double block and bleed ball valve is used after the isolation of the onstream flow of fluid from either ends of the pipeline to drain out excess media.

To reduce the risk of potential leakage into the atmosphere, industrial valves supplier Dombor manufactures double block and bleed valves, alongside the separate valves saving weight and space on the piping layout.

The Lowest-Cost Strategy Is To Choose Reliable DomBor Valves.

DomBor Valve, with its experienced specialists, specializes in manufacturing industrial valves and provides technical support and one-stop solutions for the global market.

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Generating high-quality valve solutions requires a deep insight into market needs. DomBor Valve, as a reliable valve manufacturer, relies on a trusted supply network, the latest production, and assembly machinery, along with digital design capabilities and 20 years of industry experience.

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