API 609 Butterfly Valve
An API 609 Butterfly Valve adheres to the API 609 standard for butterfly valves, categorized into Category A and B. Category A valves, known as concentric type or rubber lined butterfly valves, are common in low-pressure systems (Class 150 or less). Category B valves, termed offset type, have an offset shaft from the disc, enabling them to manage higher differential pressures.
 

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