I created a new simulation project called 'Gate Valve-CFD':
Fluid flow analysis inside a gate valve with fully opened wedge (gate)
More of my public projects can be found here.
@lcupido - the mesh looks good! What CAD software did you use to extract the flow volume?
used SolidWorks, followed the steps in the Youtube video https://youtu.be/V1zHcBw7hCA