A new valve design often begins with an industry standard, such as ASME B16.34 or API 6D, and focuses on the end user’s required performance of the valve for an application and set of service conditions. It typically includes consideration of safety, reliability, manufacturability, cost of manufacturing, and marketable features. But often the missing design parameter is one of the most important to an end user– repairability. After all, “Valves never leak.” That statement will give any plant operator or startup engineer a good laugh. They know that even the best-designed and most robust produced valves can be damaged, experience seat wear, or require retrim.