What is the purpose of the nonreturn valve in the KM37 system?

The nonreturn valve in the KM37 system serves the essential function of preventing the reverse flow of gas from the helmet back to the umbilical. This is crucial for maintaining a steady and safe supply of breathing gas to the diver. If gas were to flow backward, not only would it compromise the diver’s air supply, but it could also lead to dangerous situations, such as the potential for contaminated air being drawn back into the helmet. The nonreturn valve ensures that the gas flows in only one direction—from the source through the umbilical and into the diver's helmet—thereby maintaining the integrity of the breathing system and supporting the diver’s safety while underwater.