The main structure and functions of each part of Dewars are as follows:

1. Outer Cylinder: In addition to protecting the inner cylinder, it also forms a vacuum inter-layer with the inner cylinder to prevent the intrusion of heat outside the bottle and reduce the natural vaporization of the cryogenic liquid in the bottle;
2. Inner cylinder: store cryogenic liquid(cryogenic dewars);
3. Vaporizer: Through heat exchange with the inner wall of the outer barrel, it can  convert the liquid gas in the bottle into gas;
4. Liquid valve: control the Dewar to fill or discharge liquid from the bottle;
5. Safety valve: When the pressure of the container is largerthan the maximum working pressure, it will automatically relieve the pressure, and its take-off pressure is slightly larger than the maximum working pressure;
6. Drain valve: When the Dewar is filled with liquid, use this valve to discharge the gas inthe gas phase space in the bottle to reduce the pressure in the bottle to fill the liquid quickly and smoothly. Another function is that when the pressure in the Dewar bottle exceeds the maximum working pressure during storage or other conditions, this valve can be used to manually discharge the gas in the bottle to reduce the pressure in the bottle; 
7. Pressure gauge: indicates the pressure of the inner cylinder of the bottle;
8. Boosting valve: After this valve is opened, the liquid in the bottle will exchange heat with the outer cylinder wall through the booster coil, vaporize into gas, enter the gas phasespace on the upper part of the inner cylinder wall, and make the cylinder build up a certain driving pressure (Internal pressure) to drive the cryogenic liquid in the bottle to flow;
9. Use valve: It is used to open the pipeline passage between the liquid vaporizationcircuit of the Dewar flask and the gas inlet end of the user. This valve can also be used to control the gas flow rate;
10. Liquid level gauge: It can indicate the level of the liquid level in the container moreintuitively, and the installation position should be convenient for the operator to observe and repair.