Butterfly valves are widely used in water treatment, HVAC, industrial processing, oil and gas, chemical plants and general pipeline applications.
However, choosing the right butterfly valve requires several technical decisions.
Common types include:
Wafer valves are installed between two flanges.
They are compact and economical and are widely used in water and industrial applications.
Lug valves have threaded lugs around the body and can be independently bolted to the pipeline.
Flanged butterfly valves use integral flanges and are suitable for applications requiring robust flange connections.
Double eccentric butterfly valves reduce friction between the disc and seat during operation.
They are widely used in larger diameter water and industrial pipelines.
Common materials include:
For water applications, ductile iron is commonly selected for larger diameter valves because of its strength and cost balance.
Possible materials include:
Common elastomers include:
EPDM is commonly selected for water applications, while other materials may be required depending on temperature and chemical compatibility.
Butterfly valves can be operated by:
For larger sizes, manual gear operators are commonly used because direct lever operation becomes impractical.
Typical pressure ratings include:
The valve pressure rating should match the pipeline design requirements.
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