1, according to the state of the refrigerant

Gaseous tube: the refrigerant in the pipeline is in a gaseous state;

Liquid tube: the refrigerant in the pipeline is in a liquid state;

2, according to the pressure classification

High pressure pipe: a car air conditioning pipe from the compressor to the expansion valve;

Low pressure pipe: the air conditioning pipe from the expansion valve to the compressor;

The air-conditioning duct of the automobile is like the “ribs” of the air-conditioning system, so that the relevant components dispersed inside the vehicle body are closely and orderly connected, and energy can be transmitted to each component to ensure its normal operation.