Siemens LDU11.523A27 Gas valve proving system

Automatic gas valve proving system for gas burners.


  • Automatic gas valve proving (leakage test) based on the pressure proving principle.
  • Used in connection with 1 or 2 commercially available pressure switches, valve proving is
    automatically initiated with every burner startup, either
    – prior to burner startup
    – during the prepurge time if it lasts a minimum of 60 seconds
    – immediately after a controlled shutdown, or
    – on completion of the burner control’s control sequence, e.g. at the end of the
    postpurge time


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