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Help Modifying A Part


New member
I have a 2" ball valve I downloaded from GrabCAD but I need to modify the fitting slightly to fit the profile of my existing drawing.

In the sketch for the revolve feature there is a half circle that defines the gasket groove. I need to modify this circle to be a slightly different size and in a slightly different position.

The problem is if I just draw a circle and try to dimension it into place, I'm unable to actually change the dimensions.

Could somebody point out to me the reasons why this is happening and what relation is preventing me from making the needed changes?

I just need to modify the profile to match tube it will be mated to.