Static and Dynamic Balancing Valve: What is the Difference?

The function of a balancing valve is simple: the intended amount of water should flow through each circuit. There are two types of valves that achieve this in two different ways.

Static Balancing Valve (SBV) is installed manually once. The installation value is calculated based on the current system conditions. When the pressure difference in the system changes — for example, when other circuits are opened or closed — the flow through this valve also changes. Therefore, static balancing works correctly in systems with constant loads and relatively simple configurations. In our catalog, flanged SBVs range from DN40 to DN500, while the threaded version ranges from DN15 to DN50.

Dynamic Balancing Valve (DBV) contains an automatically operating cartridge. This cartridge maintains a constant flow within a specific pressure difference range — meaning that changes occurring in other circuits do not disrupt this circuit. In our wafer-type DBV models, the working ΔP range is from 7 kPa to 600 kPa, and the size range is from DN50 to DN800.

The selection rule in practice is as follows: in buildings with highly variable loads and numerous fan-coil circuits, a dynamic valve is more suitable; in systems with constant loads and fewer circuits, a static valve is more appropriate and economical. The dynamic valve also reduces installation time, as there is no need to adjust each circuit separately.