Triple eccentric/Offset metal to metal seat wafer Butterfly Valves DN250 PN16

Material:	CF8
Nominal Pressure	PN16
Nominal Diameter:	DN250
End Sealing:	Wafer
Face To Face:	ASME B16.10
Working Temperature:	-254℃～500℃
Test And Inspection:	API 598MSO 5208
End Connection:	Wafer
NACE:	NACE 0175
Certificate:	ISO9001, ISO14001, ISO28001, TS, CE,TUV

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

Marking                                 

Every valve in DBV with clear LOGO and Marking on the valve body.

 











Casting of Disc                            

We choose the best raw material supplier of Stainless steel ASTM A351 CF8















Metal to Metal sealing
  
We protect every tiny detail of the seat sealing,very smoothly

to ensure excellent sealing performance.DBV butterfty valve

adopts all metal forged seal ring,overlays stellite alloy on the

sealing surface,its advantages are anti-wear,anti-erosion

and long service life,etc.






Flange face finish
  
The ASME B16.5 code requires that the flange

face(raised face and flat face)has a specific

roughness to ensure that this surface be compatible

with the gasket and provide a high quality seal.







  Triple Eccentricity Design Features  
 The stem is offset on both the X (1)and Y (2) axis of the valve's
center line. This produces a cam一like motion. The third offset (3)
consists of an inclined conical  profile machined into  the  valve
sealing  surface. This allows rotary engagement and disengagement  
of   the   seat   and   seal   ring without interference.  All  rubbing
between  seat  and seal ring is thereby eliminated. Once the seat
and seal ring are  fully  engaged  torque  is applied in order to 
create a bi一directional, zero leakage,  metal-to一metal seal. For
this reason, triple offset valves are often defined as "torque" seated
rather than”position” seated as in the case of resilient or high performance products.