WTV series temperature responsive expansion valves ( liquid injection) has two functions, one is used to desuperheat the exhaust of the refrigeration compressor and the second is to desuperheat the motor of the compressor. WTV series valves accept the liquid refrigerant from the outlet of the condenser, which be throttled via it, and be spurted to the compression cavity through the compressor inlet, and the desuperheat the refrigerant and motor, which desuperheat the exhaust and motor of the compressor. In order to achieve the goal of improving the effectiveness of refrigeration system.