Why are the internal part numbers specified in API 600 2015 trim1 and 2 considered obsolete?
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As stated in the question, referring to tables 8 of API 600 2015, for trim1 and trim2, the nominal lining materials are F6 and 304 respectively. What does it mean that the notation for lining numbers 1/2 is marked as obsolete? Previously, quite a few valve internals used trim1, right?
The discontinuation of the internal part numbers 1/2 in API 600 2015 means that these numbers are no longer used in the new standard specifications. Valves that previously used trim1 and trim2 internal parts can continue to be used, but these numbers will not be employed in new designs and manufacturing. The original numbers may be replaced by new numbers or material specifications. .
The process has poor applicability, but in order not to disrupt the existing code system, it is marked as obsolete while keeping all other combination codes unchanged
The new version of trim 2# has been changed back and is now available for use. Number 1 should still be phased out; in other words, if you use API 600, the new valves cannot employ Number 1 valve internals, and in China TRIM 8# is generally used as a substitute.
In the API 600 2015 standard, Trim 1 and Trim 2 represent two different valve trim configurations; F6 and 304 stainless steel are used as the materials for the nominal trim components. The trim designation 1/2 is obsolete, indicating that a certain trim configuration or numbering may have existed previously but is no longer recommended or meets the current standard requirements. Previously, Trim 1 (F6 material) was commonly used for valve internals, but with technological advancements and updated standards, new configurations and materials may be introduced.