RAVK is self-acting thermostatic actuator primarily for use for temperature control of small hot water cylinders (e.g. storage tanks) or heat exchangers in radiator heating systems.RAVK can be combined with:- 2-way valves RAV-/8, VMT-/8, VMA, or- 3-way valves VMV and KOVM Controller closes on rising temperature.RAVK 25-45 oC can be combined with VMV DN 15 and DN 20 valves. This combination is used for temperature control in a mixing loop for hot water service.