Influence of various operating conditions of a compressed air breathing apparatus on the stability of the lung demand valve
DOI:
https://doi.org/10.33408/2519-237X.2026.10-1.41Keywords:
compressed air breathing apparatus, lung demand valve, icing, low temperatures, reliability, fire safetyAbstract
Purpose. To experimentally evaluate the influence of various operating conditions of a compressed air breathing apparatus on the stability of the operation of the lung demand valve of a compressed air breathing apparatus.
Methods. Empirical research methods included experimentation and measurement. Theoretical methods included analysis and synthesis of literary sources, as well as statistical processing and generalization of the obtained experimental data.
Findings. Based on operational tests, it was established that a decrease in ambient temperature (down to -3 °C) in conditions of high humidity and simulated exposure to water aerosol (while fire extinguishing) leads to increased inhalation effort. As work intensity increases, breathing becomes more difficult due to the increased amount of air to be consumed, and in some cases, impossible. The primary cause of failure is icing of the inhalation valve seat and plate, leading to their mechanical sticking and complete blockage of air supply to the sub-mask space, as well as to disruption of the continuity of air supply to the sub-mask space.
Application field of research. The research results can be used by the Ministry of Emergency Situations in developing recommendations for the safe use of breathing apparatus in low-temperature conditions: monitoring and preventing icing, and actions at the first signs of increased breathing disruption.
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Copyright (c) 2026 Lakhvich V.V., Morozov A.A., Kozlov E.A., Shatilov Y.S., Anis'kov V.I.
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