butterfly valve flange type Description
The sealing structure of the flange butterfly valve uses PTFE, synthetic rubber, and phenolic resin to form a composite seat, providing the seat with both elasticity and enhanced strength. Additionally, the butterfly plate is fully coated with PTFE, giving it strong corrosion resistance.
flange end butterfly valve Specification
| DN/NPS |
DN250 – DN1800 (10" – 70") |
|---|---|
| Operating pressure |
PN6, PN10, PN16 |
| Flange connection |
ANSI CL150, PN6, PN10, PN16 |
| Top flange |
ISO 5211 |
| Marking |
EN 19 |
| Face to face length |
EN 558-1/20 |
| Test standard |
EN 12266-1 |
| Application |
Dams & hydropower, HVAC, Industrial, Irrigation, Power plants, Sewage & wastewater treatment, Water treatment |
butterfly valve flange end
Classification of Flanged Butterfly Valves
Flanged butterfly valves can be divided into soft-seal flanged butterfly valves and hard-seal flanged butterfly valves based on the sealing surface material.
- The sealing side of a soft-seal flanged butterfly valve uses elastic sealing materials such as rubber and fluoroplastics. In contrast, the sealing side of a hard-seal flanged butterfly valve uses materials like metal-to-metal, metal-to-fluoroplastic, and multi-layer composite plates.
The sealing ring of a soft-seal flanged butterfly valve can be embedded in the valve body's channel or around the periphery of the butterfly plate. When used as a shut-off valve, its sealing performance can reach FCI70-2:2006 (ASMEB16-104) level VI, which is significantly higher than that of a hard-seal flanged butterfly valve. However, due to the temperature limitations of soft sealing materials, soft-seal flanged butterfly valves are typically used in water conservation and water treatment fields at room temperature.
- Metal hard-seal flanged butterfly valves have the advantage of material durability, can withstand higher working temperatures, greater working pressures, and have a longer service life than soft-seal valves. However, the drawbacks of hard-seal flanged butterfly valves are also very apparent-they are difficult to achieve complete sealing, and their sealing performance is relatively poor. Therefore, this type of flanged butterfly valve is generally used in applications where high sealing performance is not required, primarily for regulating flow.
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