Is this correct

I am still learning about flow, flow characteristics and how to understand it better. I have 3 buffer tanks on the leaving water side of the chillers. The entering and leaving water sides of the buffer tanks are on closely spaced tee's with an isolation valve in the common pipe. They had me close the iso valve on the common to "force water" into and out of the buffer tanks. The pumps are pumping into and through the chillers and buffer tanks going to a large ahu then back into the pumps. What should i know about this. I always love learning new things and very much strive for excellence. I believe that the iso valve in the common pipe doesn't need to be closed, but i could be wrong...thats why im posing this question.