Safety protection: When the system has abnormalities such as high and low pressure imbalance, cut off the refrigeration circuit in time to prevent compressor liquid shock and system damage. Multi-connection coordination: In a multi-connection system, the operation modes of multiple indoor units can be coordinated to meet the needs of partial cooling and partial heating. Refrigeration and heating switching: By changing the flow direction of refrigerant, the cooling function of the air conditioner in summer and heating in winter can be converted to meet the needs of indoor temperature regulation in different seasons. Air Conditioning Four-Way Directional Valves ，Compatible For Sanhua ，SHF-20A-46 5P Air Conditioner Solenoid Coil Control Inverter Port 12x19, Weight: 0.110231131 Pounds, Manufacturer: GENTERUN