From what i understand, the valve manufacturer does not need to perform fugitive emission tests. However, the valve manufacturer must use stem packings that is tested and qualified for fugitive emission standards. This is a development of ANSI/FCI 91-1-1994 "Standard for Qualification of...
We encountered a problem recently in one of our metering station where the valve is plugged up. When the valve was disassembled, the sulphur dust have somehow collected on the drilled-hole cage. The gas stream is heated upstream and no plugging occurs in the piping until it reaches the valve...
