OS3 Safety in Use



Intent 1:

To limit the probability that performance of temperature relief, pressure relief, combined temperature and pressure relief and vacuum relief valves will fall significantly below expectations, which could lead to failure or inadequate operation of such valves, which could lead to an inability to regulate the temperature or pressure of water, which could lead to:

  • excessively high water temperatures, or
  • excessively high water pressure.

This is to limit the probability of harm to persons.

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