Don’t use the Parameter node as pictured, this has a different use within workflows.
Instead use the Element.SetParameterByName node
Though you are trying to change a Family parameter that is usually set within the Familiy Editing environment, so a slightly different workflow will be needed.
You may need to look into ‘background open’ workflows to open a bunch of Family documents, adjust the parameters, save, and reload into the Project environment.
Hey, thanks for the tips, but when I try to do this with the value “0” to uncheck the parameter Always vertical, it does change the value to “0” in Dynamo but not inside Revit, the process of changing the value and reimport the object inside Revit is not processing…
when I check doing getparametervaluebyname after setting the parameter, it seems alright but not in Revit.
If that is a type parameter then I think you need to go the long way. You can collect and export all those families to a directory and change values and re-import into project. This can be done in single graph.