The Introduction of New Technology and Craft of DBV Triple Offset Fully Metal to Metal Seated Butterfly Valve

The design features of DBV triple eccentric butterfly valves:                                                                                                               

The first eccentricity: 

The deviation between stem rotation center and the seat centerline ensures a tight seal between the seat and disc.

The second eccentricity: 

The deviation between sealing cone center and the valve centerline, when the valve opens, can make the butterfly plate leaves sealing surface quickly.

The third eccentricity: 

The deviation between sealing cone center and the valve centerline, when the valve opens or closes, can eliminate the friction between the disc sealing surface and seat.

ASME Standard     

Design and Manufacture Standard                     API 609                 Inspection and                                     API 598

                                                                                                                   Test  Standard                                                                                                                 

Material Pressure-temp Standard                                ASME B16.34                          Flange ends                        Size≤24” according to  ANSI B16.5

    Face to Face          Flange Short Pattern to    ISO5752 Basic Series 13     Dimension Standard          Size≥24” according to  ANSI B16.47 Series B

Dimension Standard  Flange  Long Pattern to            ASME B16.10                Fire Safe Standard                                          API 607        

                  Testing Pressure at Constant  Temp.（MPa）                                     

Pressure                                                                                               Applicable Temp.                     Applicable Medium

                      Shell Test             Seal Test             Air Test                                                                                                                                                              

            150          2.93                            2.07                        0.6

Class   300          7.58                            5.52                        0.6             -46℃~550℃                               W.O.G. etc.

            600          15.0                           11.03                       0.6

            900          22.5                            16.5                        0.6                                                                                                                                                        

  DIN Standard     

Design and Manufacture Standard                     DIN 2559                   Pressure Test                            EN 12266-1                

                        Testing Pressure at Constant  Temp.（MPa）                                     

Pressure                                                                                               Applicable Temp.                     Applicable Medium

                            Shell Test        Seal Test             Air Test                                                                                                         

Nominal    1.0          1.5                 1.1                              

Pressure    1.6          2.4                1.76                 0.5~0.7 Mpa              -40℃~570℃                               W.O.G. etc.

                  2.5         3.75               2.75                                                                                                                                          

  GOST Standard   

Design and Manufacture Standard              JB/8527  API609             Pressure Test                         GB/T 13927   API598            

                        Testing Pressure at Constant  Temp.（MPa）                                     

Pressure                                                                                               Applicable Temp.                     Applicable Medium

                            Shell Test        Seal Test             Air Test                                                                                                         

Nominal    1.0          1.5                 1.1                              

Pressure    1.6          2.4                1.76                  0.6 Mpa                   -40℃~570℃                               W.O.G. etc.

                  2.5         3.75               2.75                                                                                                                                           

PS: We also can make according to customer's requirements.

  Characteristics    

Triple eccentricity refers to an angle eccentricity added on the basis of the double eccentric structure, as the butterfly valve sealing surface shows an oblique cone. This structure is characterized by the outer side of the disc to be processed into an oblique cone, and also the inner side of the sealing seat is processed into an oblique cone. At this time, the section of the valve sealing surface the becomes oval, thus the shape of the disc sealing surface is under the vertical asymmetry. Because the sealing surface is the oblique cone, the large part of the disc separated by the stem shaft presses the seat upwards along the large inclined surface, and the large part of the disc presses the seat downwards along the small inclined surface. The seal between the disc sealing ring and the seat does not rely on the elastic deformation of the seat, but completely depends on the compact of the touching surface. So there is no friction in the process of the triple eccentric butterfly valve basically opening and closing, and the valve closes tightly with the closing pressure increasing. It is obvious from the principle and structure of the triple eccentric butterfly valve, the triple eccentric butterfly valve has the following advantages:

1) The sealing performance and reliability of the system are improved.

2) The friction is low, and the valve opening and closing flexibly.

3) The valve service life is longer and it could switch repeatedly.

4) The resistance of pressure and high temperature is improved, and the range of applications is wide. 

  Characteristics    

1. DBV butterfly valve is characterized by simple structure, small volume and light weight, and it is easy to install and adjust.

    The valve is widely used in the medium and low pressure pipeline. 

2. Good sealing performance，corrosion resistance，high pressure and temperature resistance, smart control and safe use.
3. The unique design of triple eccentricity makes no friction between the sealing surface and extend the valve service life.
4. The elastic seal is produced by the torque. 
5. The wedge design makes the valve close more and more tightly by automatic sealing function, and there’s compensation  

    and zero leakage between the sealing surfaces.

  Material for Main Parts   

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  Products Show                                                                                                                                                                                                 

Gear Operated                                                                                         Pneumatic Actuator

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  DBV Introduction  

1. Factory Overview

2. Quality Control

3. Storage and Warehouse

4. Package and Delivery

5. Honor and Certificate

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1.Custom Visiting

2.Exhibition

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