Material selection criteria for the internal components and other parts of butterfly valves
Thread Content
For butterfly valve specifications such as API609, unlike API600 and API623, which clearly distinguish between the internal components and those components outside the internal parts and provide guidelines for material selection, these specifications are even less detailed than API608. What is the reason for this? BS5155 also makes no such distinction
The material selection for the internal components and other parts of a butterfly valve depends mainly on the specific operating environment and conditions. Standards such as API 609 and BS 5155 do not specify clear criteria for selecting materials for the internal components and external parts. This is because the structure of butterfly valves is relatively simple, consisting mainly of a valve body, valve disc, valve stem, and sealing surfaces; the selection of materials in such valves focuses more on overall performance, and the operating environment (such as temperature, pressure, and medium) must be taken into account to determine the appropriate materials. Therefore, when formulating these standards, there is a greater emphasis on selecting appropriate materials based on actual usage conditions, rather than specifying details for each individual component. These factors result in no overly clear classification in the standards regarding the material selection for the internal and external components of butterfly valves. .