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Model 121

Achieve greater capacity, higher inlet pressure, more accurate performance and a faster response for higher volume commercial/industrial applications with our industrial combustion regulators.

These regulators provide an unbeatable combination of capacity, performance and economy. In most applications, our design allows you to use a smaller regulator than other brands for primary control or monitoring, or both.

Both the Model 121 and Model 122 are highly functional regulators that feature die-cast diaphragm cases and cast iron bodies. This makes them strong and corrosion resistant. Both models incorporate soft-seat valve material, plus a precision-machined “knife edge” orifice for a positive, tight shutoff.

They can be used in a variety of commercial and industrial applications including burners, boilers, furnaces, air heaters and kilns. These regulators also work well for gas engines where fast response improves overall performance.



Allows above-ground or vault installation


Provides for pilot-operated, pressure-loaded and V-port options


Serves high-capacity installations


Allows high inlet pressures



Large capacity


Compatible with natural gas, propane, LPG, air nitrogen, etc.


Protection against overpressurization


For a complete listing of Screwed NPT and Flanged ANSI 125lb FF pipe sizes, pipe dimensions, operating temperature range, outlet pressure ranges and springs, and other specifications, download the product data sheet.