As long as all the joints in the pipe are sealed well, it doesn't matter what kind of valve you use. If there is any bit of a hole in a joint, pushing that much water through it will create a suction to where air could be pulled in, therefore you get microbubbles.

I would say if you have a handy extra pump around and it's easy to swap them out, give it a try. If anything you will at least narrow down the possible source of the bubbles. If you have a closed loop, use the bigger pump on it instead of your sump return. Also, give it some time as Don said, your joints may seal up or you may have an air pocket in one of your lines due to opening and closing valves. If the problem continues, you need to find where the system is sucking the air in from.