Sensus 121-8-1 Regulator

The Sensus 121-8-1 Regulator is a heavy-duty gas pressure regulator engineered for demanding commercial and industrial combustion applications, including burners, boilers, and furnaces. Featuring a 1-inch NPT cast iron body and a corrosion-resistant die-cast aluminum diaphragm case, this model is built for high-capacity service and rapid response times. This specific configuration includes a 2-4.25# spring (black), providing precise pressure control for natural gas, LP, and other non-corrosive vapors. Its balanced valve design utilizes a roll-type diaphragm to maintain stable outlet pressure even as inlet pressures fluctuate up to a 60 PSIG maximum.

Professional technicians rely on the Sensus 121-8-1 for its positive dead-end lockup and external sensing capabilities, which are critical for maintaining safety in high-flow systems. The unit features replaceable orifices and a double-acting vent damper to prevent hunting and ensure stable operation across its entire flow range. Whether used for primary pressure control or as a monitoring regulator, this 1-inch unit offers the high-flow capacity required for modern high-efficiency industrial heating equipment.

• High inlet pressure capability: Supports up to 60 PSIG, allowing for versatile installation across diverse service lines.
• Precise regulation: The black spring provides a stable 2 to 4.25 PSI outlet range, essential for sensitive combustion equipment.
• Durable construction: Rugged cast iron and aluminum assembly ensures longevity in harsh mechanical room environments.
• Fast response: Engineered for systems with quick-acting valves to minimize pressure spikes and drops.
• Serviceable design: Features removable orifices and color-coded springs for simplified field maintenance.

What is the maximum inlet pressure for this model?
The Sensus 121-8-1 is rated for a maximum inlet pressure of 60 PSIG, though local codes and specific orifice sizes may dictate lower operating limits.

Does this regulator require an external control line?
Yes, the 121-8 series typically requires an external sensing line connected from the lower diaphragm case to the downstream piping for accurate pressure monitoring.

Can this be used with propane?
Yes, it is fully compatible with natural gas, propane (LPG), air, and nitrogen.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.