Breathing systems and methods for making and using such systems

A system to process high pressure air into low pressure breathing air for one or more sealing and locking helmets and/or one or more air respirators, the system comprising:

• a primary air supply configured to supply a first amount of the high pressure air to a primary air module;
• a secondary air supply configured to supply a second amount of the high pressure air to the primary air module, simultaneously with the first amount of the high pressure air from the primary air supply,
• wherein the primary air module is configured to lower the pressure of the first and second amounts of the high pressure air in the primary air module to thereby form a first amount of the low pressure breathing air in the primary air module, and the primary air module is configured to supply the first amount of the low pressure breathing air from the primary air module to the one or more sealing and locking helmets and/or one or more air respirators;
• a one valve back-up circuit in a back-up air module, the one valve back-up circuit configured to receive a third amount of the high pressure air from the secondary air supply, wherein the third amount of the high pressure air bypasses the primary air module, and the back-up air module is configured to lower the pressure of the third amount of the high pressure air to thereby form a second amount of the low pressure breathing air;
• and
• a reserve bottle isolated from depletion by a one-way check valve and configured to supply a fourth amount of the high pressure air to the one valve back-up circuit in the back-up air module upon unavailability of the secondary air supply for the one valve back-up circuit, and the back-up air module is configured to lower the pressure of the fourth amount of the high pressure air to thereby form a third amount of the low pressure breathing air.