In light of the information provided, the inner chamber is used in hydrozone welding systems as follows:
** Pure water is put into the inner chamber.
This pure water provides the working environment by interacting with the heat of the system; it is stated that it contributes to the formation of “micro flame & high heat”
The welding process is carried out by the heat balance / reaction established between the inner chamber and the outer chamber.
The inner chamber fluid provides the medium for heat dissipation, pressure balancing or heat transfer.