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Eclipse RatioMatic v3.00 - Design Guide No. 110, 4/98
Component Selection
Eclipse Combustion can help in the design of a main gas shut-
off valve train that satisfies the customer and complies with all
local safety standards and codes set by the authorities within
that jurisdiction. Contact Eclipse Combustion for further
information.
Note:
Eclipse Combustion supports NFPA regulations (two gas shut-off
valves as a minimum standard for main gas shut-off systems).
Valve Train Size
Fuel pressure supplied to the ratio regulator inlet must be within
the range specified in the RatioMatic data sheet. The valve train
should be sized sufficiently to provide the specified pressure.
Warning:
Do not operate RatioMatics with gas inlet
pressure less than the minimum listed on the
RatioMatic Data Sheet. Lower gas inlet pressures
may cause the ratio regulator to remain fully open
at lower inputs as the burner transitions from low
to high fire. This could result in the possible
accumulation of unburned fuel in the burner which,
in extreme situations, could cause a fire or an
explosion.
3-9
Step 6:
Main Gas Shut-Off
Valve Train