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Reply To: Is a safety valve mandatory if the pump can't exceed nominal pressure, and does the Hermetry alarm replace it?

Translated from Türkçe by AI ·

Short answer to both: install a PRV, even if you have Safe, it does not replace the valve.On the valve: the pump’s discharge head is not the only pressure source. In a closed line, water expands when it heats up, and if a section on the heat exchanger side gets trapped while both valves are closed, pressure rises independently of the pump as the temperature goes up. The same happens if the boiler’s own control fails. The pump scenario protects you, but the thermal expansion and wrongly closed valve scenarios do not. Regulations already require mechanical safety for pressurised equipment, so your installer is right.On Hermetry: Safe has no page of its own in the documentation, so you need to ask sales how it works, as Ergun said. But whatever software product it is, I don’t think it will replace a mechanical valve; monitoring and protection are separate layers.What you can do today is set up monitoring well. In the profile, on the Alarm rules tab, a Threshold rule with two levels:

"severities": [
  { "severity": "CRITICAL", "condition": { "key": "p_bar", "op": ">", "value": 5.6 } },
  { "severity": "MAJOR",    "condition": { "key": "p_bar", "op": ">", "value": 5.0 } }
],
"debounce": { "mode": "count", "raise": 3, "clear": 3 },
"hysteresis": 0.2

Also add a Device offline rule. If the transmitter or ESP32 goes silent, you should be notified, so a silent sensor doesn’t look like everything is fine.

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