TC · Edition 08.17 4
TC 1, TC 2 TC 3 TC 4
Application
The tightness control TC checks the fail-safe function
of both valves before each start-up or after each shut-
down of a system with two safety valves.
The aim is to identify an inadmissible leak on one of the
gas valves and to prevent burner start. The other gas
valve continues working properly and takes over the
safe shut-off of the gas supply.
It is used in industrial thermoprocessing equipment, on
boilers and on forced draught burners.
Standards ISO 135772, EN 7462 and EN 676 stipu-
late tightness controls for capacities over 1200 kW
(NFPA 86: from 117 kW or 400,000 Btu/h in conjunc-
tion with a visual indicator). Pre-purge of the combus-
tion chamber can be dispensed with under certain
conditions in accordance with EN 7462, if a tightness
control is used. In this case, the system must be vented
into a safe area.
TC 1V, TC 1C
Tightness control TC 1V can be directly flange-mount-
ed to all valVario controls. There is only one version for
all sizes.
TC 1C can be used for combination controls CG 1 to 3.
An adapter plate is supplied for installation.
1 Application
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