DBB Ball Valve for Various Severe Application

High pressure double block and bleed Ball Valve plays more and more important role in modern industry. C Tech Science and Technology Co., Ltd accumulated rich technology and experience in design and produce the real high performance DBB function ball valve.  The DBB function ball valve used for the extreme high pressure, temperature and corrosive environment, the design should be different form the traditional design of API-6D. Especially for the small size ( ≤DN25 )DBB Valve, it is very difficult to design and produce this kind of DBB Valve.  It should be totally different from the traditional design.

Recently, C Tech Science and Technology Co., Ltd has design the DBB Ball Valve for the Fluidized Catalyst Cracking (FCC) Unit if Oil Refining Company located in China. Our double block and bleed ball valve assure double isolation function thanks to two ball inserted in a single body, and they provide the bleed function by means of a vent system located between the two balls. It has already been used by the final user successfully for about 2 months. Some critical parameters about this valve as below:

No Type Size Temperature  Pressure  Fluid Medium  Body MTR Ball and Seat Material  Leakage  Quantity 
1 Ball Valve DN20 385℃ 2500LB Catalyst Contained Corrosive Gas 316L Inconel 718 +Tungsten Carbide Coating of HVOF(JP-8000) Zero Leakage (VI ANSI FCI70-2) 6
2 Ball Valve DN25 385℃ 2500LB Catalyst Contained Corrosive Gas 316L Inconel 718 +Tungsten Carbide Coating of HVOF(JP-8000) Zero Leakage (VI ANSI FCI70-2) 6

Ball and seat coating was coated by Praxis TAFA JP-8000HP/HVOF. The ball hardness id HRC68, and the seat hardness is HRC65. And special grinding equipment was also adopted to keep the high sealing performance of the Valve (Sealing at 360 ° Rotation).

C Tech Science and Technology Co., Ltd could provide excellent solution after the application data analysis and reviewed. Such as Fire Safe, Anti-static, Anti-blowout design and so on. This kind of valve can be sued for various industrial. Such as Power Generation, Coal Chemical and so on.

Focus on DBB function twin ball valve which was used for the power plant, some basic structure as the photo below: