What is double block and bleed ball valve

Double block and bleed ball valve, mainly used in valves, as mentioned above, if it is the DBB at the root of the instrument, it means that the root valve includes 2 shut-off valves and a discharge valve. It is divided and consists of 3 valves. One-piece, there are 3 external operating handles, and another refers to the shut-off valve (mainly ball valve) used on the pipeline, when the valve cavity is required to drain 9bleed), the upstream valve seat and downstream valve are both in a closed state

Get A Quote

Plus type fully equipped

CNC machine tools ,large vertical lathes, drill press, milling lathe grinding machine , Welding machine , separate metal working workshops and many general machine tool etc.

Multiple tests

Material analysis, PMI Material analysis. Chemical analysis. Low temperature test, Tensile Test ,Impact test, Hardness test. Wall thickness test, roughness test. Torque test. NDT Inspection (MT,PT,UT,RT). HIC test ,SSC test . Intercrystalline corrosion Test ,Uniform corrosion Test.

Passed ISO certification

The company is the first one to pass ISO 9001(2008),ISO 14001 ,OHAS 18001 international quality system certificate, China pressure pipe safety registration certificate (AZ), European Union safety registration certificate (CE0036), and American Petroleum Institute Certificate (API 6D) and (API607) .

Industry Association Member

We are one of the member unit of China Valve Association as well as China Gas Association, member unit of first class supplying network of CNPC and member unit of fittings supplying network of State Power Corporation.

Related Products

More items about double block and bleed ball valve

about us

We Have The Best Solutions for Your Business

EDVC VALVE CO.,LTD.is a specialized in valve manufacturing enterprise with more than 15 years of history.We main produce Top Entry Ball Valve, Fully Welded Ball Valve, Arc Valve, Aluminum Bronze Valve, Automatic Recirculation Valve, Orbit Ball Valve, Safety Valve, Globe Valve, Tilting Disc Check Valve and Rising Stem Ball Valve etc.


The products have been exported to Austria, France, Germany, United Kingdom ,America, Middle East and Asia, Africa . areas and countries. Moreover, the products are widely used in the fields of oil & gas, Oil refinery, Petrochemical,power station ,Sewage treatment, pharmacy, Paper mills, pipeline industry , mining industry , chemical industry and environmental protection.

We are a professional manufacturer of valves in China, with the aim of "providing the first class products and services". On behalf of all of the members at EDVC Valve, we thank you for the opportunity to earn your business.

Learn More

Double Block And Bleed Ball Valve Production

In meter block service, the differential pressure across each closed valve is very low. No assistance is required from the line pressure to energize or compress floating seals to make them hold tight. The seals typically rely on springs to press them against the ball unless the body cavity in a ball valve is vented.

The Double Block And Bleed Valve is a kind of hydraulic manifold.

The Double Isolation And Bleed Valve is known to replace the existing conventionally used methods, which were employed by pipeline engineers. Typically a Double Block And Bleed Gate Valve is used as a unit or manifold. Hence, the Double Block Bleed Valve is to be installed for positive isolation. Used for critical process service, Double Block And Bleed Plug Valve are designed for high pressure systems or the  Double Block And Bleed Ball Valve can be used for toxic or hazardous fluid processes.

Double Block And Bleed Ball Valve Supplier

In meter block service, the differential pressure across each closed valve is very low. No assistance is required from the line pressure to energize or compress floating seals to make them hold tight. The seals typically rely on springs to press them against the ball unless the body cavity in a ball valve is vented.

Double Block And Bleed Ball Valve Manufacturer

Double Block and Bleed Valve is a side-entry ball valve, with either a bolted or welded body, designed for use in upstream, midstream and downstream oil and gas applications. It requires two in-line isolation valves and a bleed valve used to drain or vent trapped fluid between the two closure elements in order to safely isolate the downstream pipe. This feature can be achieved with one single valves complete with a bleed port between the obturators.

Frequently Asked Question

Do you have any question?

Double Block and Bleed Valve is a side-entry ball valve, with either a bolted or welded body, designed for use in upstream, midstream and downstream oil and gas applications. This feature can be achieved with one single valves complete with a bleed port between the obturators.

DBB means double block and bleed. As per API 6D, a double block-and-bleed ball valve is a single valve with two seating surfaces, each of which, in the closed position, provides a seal against pressure from both ends of the valve with a means of venting or bleeding the cavity between the seating surfaces.

Double block and bleed valves are most commonly used in the oil and gas industry, but can also be helpful in many other industries. It's typically used where bleeding the valve cavity is required, where piping needs isolation for maintenance, or for any of these other scenarios: Prevent product contamination.

Get In Touch

Don't hesitate to contact with us

Sending your message. Please wait...