What is the double flanged butterfly valve

What is the double flanged butterfly valve specification?

1.Basic specification
Nominal diameter:2"~72"
Applicable pressure :10
Applicable temperature:-20°C~425°C
Materials of main parts:WCB, CF8,CF8M,CF3M ,C95800
Applicable medium:Air, water, steam, gas as well as weak corrosive media, such as acid,

double flanged butterfly valve

alkali, and salt and so on.
Driving mode:Gear, electric, pneumatic,
Seat :EPDM / PTFE / NBR / FKM

2.Standard:
Design & Manufacture:AWWA C504 / API 609
Flange Connection:AWWA C207 / ASME N16.5 / ASME B16.47
Face to Face Dimension:AWWA C504 / API 609
Test & Inspection:AWWA C504 / API 598

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