Most of the valve cores used for thermostatic shower faucets on the market are paraffin wax bulbs and memory alloy springs. The paraffin valve core uses the principle of a special paraffin that expands when heated and contracts when cold, pours high-purity special paraffin into a small hole container, and the container mouth is covered with a rubber sensor sheet. When the water temperature exceeds the set temperature, the paraffin expands and pushes up the rubber sensor sheet, thereby driving the spring piston in the valve to close the valve a little bit. When the valve is closed, less hot water will come in, and the water temperature will increase. reduce. When the water temperature is too low, the paraffin shrinks, and the sensor sheet drives the piston to open the valve a little bit, so that more hot water can come in, so that the water temperature becomes higher. In the process of this piston driving the valve to open and close, it will suddenly open too large, and too much hot water will come in, causing the water temperature to exceed the set temperature for a moment, and then the valve will be closed correspondingly - a little bit, Adjust the water temperature back to the required temperature, which is called the instantaneous temperature overshoot. The instantaneous overrun value of the paraffin valve core is about 5 ℃ ~ 10 ℃. The working principle of Jiyi alloy valve core is completely different. It is made of nickel-titanium alloy shape memory alloy spring. Its appearance is not much different from that of ordinary springs, but it can pop up or compress according to the change of water temperature, thereby driving the valve. An internal piston opens and closes the valve. In the memory alloy valve core, the shape memory alloy spring itself not only acts as a temperature sensing element, but also pushes the piston to adjust the mixing effect of cold and hot water, and the mixed water can also pass through the spring, which saves valuable space. Make the temperature valve core more delicate. It not only responds very quickly, but also the temperature is controlled below 2°C, which greatly improves the comfort of the shower.
