What is DBB ball valve

The DBB ball valve is a valve with double shutoff, double shutoff and relief function. The valve with double shutoff and double cutoff and relief function is suitable for aviation kerosene, light oil, natural gas, liquefied gas, pipeline gas, chemical medium and other pipelines, as an ideal device to cut off the medium.
It reduce the leakage point in the system, save installation space and reduce the pressure of the pipeline system. So, this type valevs are widely used in power, petrochemical, metallurgical, marine, petroleum, natural gas, gas, pharmaceutical and other industries in the hydraulic system pipeline.

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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.

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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.

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Features of DBB Ball Valve

Trunnion Mounted Ball
Floating Spring Loaded Seat
Double Block and Bleed (DBB) Design Available
Full Port for Pigging Operation
Fire Safe to API 607
Antistatic Design
Anti-blowout Stem
Gear Operation or Actuator Available

DBB ball valve features

① During the opening and closing process of the valve, there is no contact between the sealing surface of the valve body and the sealing surface of the sliding plate. Therefore, the sealing surface has no friction and wear, the valve has a long service life, and the switching torque is small;
②When the valve is being repaired, there is no need to remove the valve from the pipeline, just disassemble the bottom cover of the valve and exchange a pair of sliding plates;
③The valve body and cock are reduced in diameter, which can reduce the cost;
④ The inner cavity of the valve is plated with hard chromium, and the sealing area is hard and smooth;
⑤ The elastic seal on the sliding plate is made of fluorine rubber, and it is molded into the groove on the surface of the sliding plate. The metal-to-metal seal with fireproof function is used as the backing of the elastic seal;
⑥ The valve has an automatic relief device (optional), after the valve is completely closed, to prevent abnormal pressure increase in the valve cavity and test the effect of the valve;
⑦ The valve switch indicator is synchronized with the switch position to accurately display the valve switch status.

The main application of DBB ball valve in the petrochemical industry

Low temperature service.
Low temperature.
Ambient temperature.
high temperature.
Corrosive liquid.
high pressure.
Take samples from the production line.
Liquid injection.

Applicable Standards of DBB Ball Valve:

a) Design & Manufacture: API 6D, BS 5351, API 607
b) Face to Face: API B16.10, API 6D, EN 558, DIN 3202
c) End Connection: ASME B16.5, ASME B16.25, EN 1092, JIS B2220
d) Test and Inspection: API 6D, EN 12266, API 598

Frequently Asked Question

Do you have any question?

According to API, a DBB valve is a "single valve with two seating surfaces that, in the closed position, provides a seal against pressure from both ends of the valve, with a means of venting/bleeding the cavity between the seating surfaces."

It's typically used where bleeding the valve cavity is required, where piping needs isolation for maintenance, or for any of these other scenarios: 1.Prevent product contamination. 2.Remove equipment from service for cleaning or repair. 3.Meter calibration. 4.Liquid service near waterways or municipalities. 5.Transmission and storage.

A DIB-1 ball valve has two double-piston-effect seats. DIB-2 has single-piston-effect design (DBB) for one seat and double- piston-effect design (DIB) for another seat.

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