Manual and mechanical valves02

Butterfly valve

A butterfly valve is a quarter-turn valve with a rotating disc. Its low weight, short face-to-face dimension and actuator compatibility make it common in medium and large sizes. Concentric, double-offset and triple-offset designs have different sealing behaviour and pressure-temperature capabilities and are not automatically interchangeable.

Application and duty

Medium and large sizes, water, utilities and many process services

TECHNICAL REFERENCE

Selection summary

Size range
NPS 2–12 (DN 50–300)
Pressure class
ASME Class 150
End connection
Wafer body
Body material
ASTM A216 WCB · ASTM A351 CF8M · ASTM A217 WC6
Design standard
API 609 Category A · MSS SP-67 · ASME B16.5 · API 598 · EN 558 Series 20
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