1) Ensure the feature has the Valve model name.
2) The GASTRACEWEIGHT field has the GASTRACEWEIGHT model name.
3) The GASTRACEWEIGHT is of type long integer.
If all of these are correct. Try adding the valve to the gas network and setting the traceweight field to the GASTRACEWEIGHT field during that process.
Hopefully this helps.
The first three steps we already done, and I was unable to add the autoupdater.
But after I created a geometric network and added the gastrace weight, the option was avaialble.
Thanks for the help.