The liquid injection valve（WTV（ is usually installed on the pipeline near the suction port of the refrigeration compressor. The inlet of the valve is connected to the outlet pipeline of the condenser of the refrigeration unit, while the outlet is connected to the suction pipeline of the compressor. To ensure accurate and responsive injection, the sensing bulb of the valve should be installed on the discharge pipe near the compressor's outlet. It must be tightly secured on the upper side of the discharge pipe using dedicated straps and insulated with an external thermal insulation layer.
An electromagnetic valve (solenoid valve) should be installed upstream of the injection valve's inlet pipeline. This solenoid valve is linked to the compressor and operates synchronously. When the compressor stops, the solenoid valve closes, effectively preventing liquid refrigerant from entering the suction line and causing liquid slugging in the compressor.
To ensure that the injected liquid refrigerant fully evaporates within the suction line, the injection point of the liquid injection valve must be located at least 2 meters away from the compressor's suction inlet. Additionally, a reverse injection method should be adopted (i.e., the injection direction is opposite to the airffow in the suction pipe), so that the hot gas and the liquid refrigerant can mix thoroughly.
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