Liquid Injector(Temperature Response Valve) is mainly designed for medium and low temperature refrigeration. When the compressor exhaust temperature is higher than the valve set temperature, the temperature bulb senses the exhaust temperature, so that the valve opens, the condenser outlet of the liquid refrigerant, after throttling and cooling sprayed into the compressor suction pipe or intermediate chamber, thus reducing the exhaust temperature, to prevent the compressor lubricating oil carbonization, to avoid degradation of the mechanical parts of the wear and tear caused by the increase in the shortening of the compressor's service life.