How are common refrigerant filling equipment made?

The gas tank can be used to fill various gases such as refrigerants. The gas tank is made up of a tank body and a tank cover assembly sealed by a tank body sealing ring. The tank cover assembly is provided with a valve mouth and a valve inside the valve mouth. It opens when pressure is pressed. In the prior art, it is usually necessary to assemble the tank body, the tank cover assembly, and the tank body sealing ring together, to vacuum the gas tank, and finally, to fill the refrigerant. There are many working steps and different Equipment processing.