I have made this so far, I am stuck where the transition is happening between those axial components
By posting, I meant the model instead of screenshots. But screenshots are better than nothing.
The advantage of the model, is we don't have to spend time re-creating what you already have. We can experiment with 2-3 different options and suggest what works best.
The drawings you are working from do not show any information regarding the detail of the transition between the vertical, and horizontal pieces. Is there a section view of the model provided?
If working only from the image of the valve, then the hexagonal extrusion is wrong. Your model extrudes a hexagon along the full length of the model. In the image, the hexagon(s) are just on the very ends of that horizontal axis.