Dynamic TRV or Pressure Independent Valves (PIV) radiator valves are equipped with a flow limiting device that allows for pre-setting of maximum water flow through a radiator. These valves come with a built-in pressure regulator that maintains a constant level of differential pressure over the valve, preventing the flow from exceeding in the face of other radiators closing within the system.
In such cases, excess flow from the circulator cannot exit the boiler and this causes it to react immediately and modulate down. Furthermore, these valves regulate the differential temperature across the system which leads to lowered return temperatures, resulting in improved condensing conditions and overall efficiency.
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