LiBr absorption units condenser pressure is high, evaporator pressure is low. U-type tube inside the liquid, play a liquid sealing effect, to prevent the upper and lower shell string cylinder. The high temperature and high pressure liquid passes through the U-type tube, and the pressure generated by the gravity of the liquid in the U-type tube depressurizes the liquid and turns it into a low-temperature and low-pressure liquid that enters the evaporator.

The height of the U-tube is the key to ensure throttling, and its value is related to the pressure difference between the condenser and evaporator. The diameter of the tube is based on the refrigeration capacity of the unit.