Eclipse Ratio Regulator, V1, Instruction Manual 742, 5/1/2009
9
Design
To select the ratio regulator best suited for a combustion
system, several parameters need to be considered. The
following steps identify those items that need to be
considered when selecting a ratio regulator.
Ratio Regulator selection based on flow:
• Define the maximum gas flow required for the
system.
• Identify the ratio regulator for that flow based on the
capacities listed in Table 3.2 of the “Specifications”
section.
Minimum inlet pressure calculation:
• Define the pressure drop through the ratio regulator
based on the Flow vs. Pressure Drop curves
(Figures 3.1 and 3.2) and conversion factors listed
in the “Specifications” section.
• Calculate the pressure losses through components
mounted between the ratio regulator and the burner.
• Define the gas pressure required at the burner.
• Calculate the minimum inlet pressure to ratio
regulator by taking 125% of the sum between the
ratio regulator drop, component drops and burner
pressure.
• Verify that the inlet pressure is within the ratio
regulator limit. If not, make the necessary changes
to the ratio regulator or the upstream pressure
control.
■ Shut off gas supply before installing or removing
the ratio regulator
General Installation Information
• Gas flow through the ratio regulator must be in the
direction of the arrow on the body.
• Make sure the gas is compatible per Table 3.1.
• Ambient temperature at the valve location must
remain between 40°F and 205°F (-40°C and
96.1°C).
• The ratio regulator must be mounted with the spring
tower in the vertical upright position.
• Allow clearance above the ratio regulator to allow
access to the bias adjustment.
• Pipe ends are to be free of foreign material
(excluding pipe dope) before connecting into the
ratio regulator body.
• Do not use the ratio regulator to support adjacent
piping.
Regulator/Pipe Connections
1. Remove the protective caps from the ends of the ratio
regulator.
2. Apply a moderate amount of pipe dope to the male
pipe threads only.
NOTE:
Excessive pipe dope could contaminate the valve
set thus affecting pressure regulation.
■ Regulator must be installed with spring tower
pointing upward, with flow in the direction of the
cast arrow on regulator body.
3. Install the ratio regulator with the flow in the direction
of the flow arrow on the body.
4. When tightening the pipe into the valve body, hold the
end of the regulator adjacent to that pipe.
Design & Installation
4
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