Automatic hot water circulation valve works on the principle of expansion and thermal balance, through each cycle of circulation, the water temperature in the return pipe increases gradually, causing the spring to gradually expand, the valve gradually closes until when the minimum flow kvmin is reached, then the valve is in thermal equilibrium. Therefore, the valve must meet the following requirements:
– Accuracy ±1°C
– Thermostat spring does not come into contact with water.
– Automatic sterilization at 70°C without motor
– Integrated branch lock, descaler
– Built-in temperature measuring point
When all axes in the system reach this state after each start of the circulation pump, then we will balance the temperature in the central hot water system.