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The sealing surfaces of butterfly valves can be divided into those with sealing requirements and those without such requirements

2025-12-27View Original

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Butterfly valves are classified by the type of sealing surface: those that require sealing (with structural style codes 0–4 in the valve numbering system) and those that do not require sealing (with structural style codes 5–9 in the valve numbering system). What is the difference between them? Is a soft seal used when sealing is required, and a hard seal when no sealing is needed?

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