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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Why Choose EDVC?

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.

about EDVC

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.

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DBB ball valve structure characteristics

Stem rush-out prevention and effective sealing structure: The valve stem adopts a bottom-mounted reverse sealing structure with a sealing gasket. The sealing force of the reverse sealing increases with the increase of the medium pressure of the valve cavity, thereby ensuring the sealing effect of the valve stem. When the valve cavity is abnormally increased in pressure, the valve stem will not be rushed out. The packing adopts a reasonably designed V-shaped structure, which can effectively convert the medium pressure inside the valve cavity and the locking force of the external gland into the sealing force of the valve stem. Fire-resistant structure: According to the needs of users, the ball valve can be designed as a fire-resistant structure. When a fire occurs and the sealing ring is burned, each sealing part of the ball valve can form a metal-to-metal hard sealing structure, which can effectively prevent the diffusion of the medium. Prevent the fire from spreading.
"With lock structure" For valves that are installed in the field or prevent misoperation by non-workers, and in some occasions with large vibrations, the handle is subject to impact and may cause misoperation. There is no lock hole in the fully open or fully closed position of the valve. , It can be locked when needed to play a role of safety insurance.
"Anti-static structure" The ball valve can be designed with an anti-static structure, that is, a conductive spring is set between the ball and the valve stem, and the valve stem and the valve body, so that the static electricity generated during the opening of the valve can be transmitted to the pipeline through the set static electricity channel Lead into the ground to achieve the purpose of removing static electricity. Avoid static sparking and ignite flammable media to ensure system safety.

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Frequently Asked Question

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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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