The working principle of a thermostatic faucet


Thermostatic faucets and thermostatic shower mixers operate similarly; both have a valve core containing a temperature sensor. This temperature sensor is made of wax or a nickel-titanium alloy. It changes shape according to temperature fluctuations, such as a wax component. When the water temperature changes, the wax's volume also changes. Then, by adjusting the valve core proportion via a control shaft, the water temperature can be regulated to maintain a constant temperature, achieving a constant water temperature output.
The valve core of a thermostatic faucet is very precise; therefore, good water quality is a prerequisite because poor water quality affects the valve core's sensitivity. When purchasing a thermostatic faucet, two filter screens are usually provided. These screens are installed inside the water inlet nut to filter impurities.
The function of a thermostatic faucet is only to maintain a constant outlet temperature; it does not display or specify the water temperature. The handwheel markings on the faucet are only approximate and inaccurate. Typically, thermostatic faucets have overheat protection around 38°. If you want to increase the water temperature, you must press the increase button to turn the handwheel.