This is also called Hydronic or Hydraulic Balancing, is the process of optimizing the distribution of water in a heating or cooling system by equalizing the system pressure so it provides the intended indoor climate at optimum energy efficiency and minimal operating cost. Most common devices for manual flow balancing are;
• Circuit Setters
• Triple Duty Valves
which allow the measurement of differential pressures which can be used to calculate a flow. There are other balancing methods but all involve measuring differential pressures and adjusting them to the correct value by calculating what flow that represents.