Unless otherwise specifically noted in this mss sp, any standard referred to herein is identified by the date of issue that was. Pdf in recent years, valve manufacturers across the globe have focused their attention towards developing control valves. Ansi said its ibr portal is an effort to make the standards reasonably available to people seeking to follow federal rules that reference them. This standard does not apply to pressure regulators as defined in the following standards. Pdf seat leakage analysis of a valve using numerical methods. In june, the fluid controls institute fci issued a. There are six different seat leakage classifications as defined by ansi fci 702.
This standard establishes a series of seat leakage classes for regulators and defines the production test procedures. Responding to the industrys request, the fci has recently updated the standard to include class viii, which is a no permissible leakage or bubble tight standard generally associated with resilient seating regulators either balanced or unbalanced with o. The fci has periodically updated the standard since the standards development in 2001. There are two things that the test standards have in common. The standard cannot be used as a basis for predicting leakage at conditions other than those specified. The standard has been revised several times through the years to stay current as the industry and its products have evolved and advanced. V alve testing standards msssp61 ansi fci 702 every valve testing standard has an acceptable leakage rate.
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