Didtek Oil Industrial Mehrschicht-Schmetterling

High Performance Butterfly Valve

Figure:DIDTEKHPBV      
Applicable Standards:               
- Butterfly valve design according to API609, ASME B16.34 
- Face to face ASME B16.10/API609
- End Flanges ASME B16.5/ASME B16.47
- Butt Welding ends ASME B16.25
- Inspection and test API 598

Size Range:
- 2"~60"
Pressure Rating:
- ASME CL, 150, 300, 600
Temperature Range:
- -196°C~650°C

Design Characteristic of Triple Eccentric Butterfly Valve

1st offset
The rotation axis of disc is moving back from
the sealing surfaces of disc. The purpose of this offset is to have a continuous sealing surface on the disc.
2nd offset
The rotation axic of disc is relocated from the centerline of the body.The purpose of this offset is to lift the disc quickly off and away from the seat ring of the body.
3rd offset
The conical axis, which is extended from the sealing surface of disc,is inclined from the rotation axis of disc. The purpose of this offset is to eliminate friction, galling and wear of sealing surfaces
during operations and to provide bubble tight shut-off at high and cryogenic temperatures.

Zero Leakage Sealing Design.
Zero leakage benefited from the unique design of the disc element and meticulously machines seat to create a perfectly matched disc and seat fit, this design also ensures that the metal seat and metal laminated sealing never be in contact with each other while the valve is cycling. Contact is made between disc seal and body only as final shut off position is reached.