Sensus 121-8-2 Regulator

The Sensus 121-8-2 Regulator is a heavy-duty commercial gas pressure regulator designed for high-capacity applications requiring precise control. Featuring a 2-inch NPT cast iron body, this spring-loaded regulator is engineered for natural gas, propane, and other non-corrosive gases. It is equipped with a specific black spring, providing a set-point outlet pressure range of 2 to 4.25 psi. The model 121 series is built with a die-cast aluminum alloy diaphragm case and a roll-type diaphragm, ensuring a fast response to load changes and a positive dead-end lockup.

Ideally suited for industrial combustion systems, this unit supports burners, boilers, and furnaces where maintaining steady pressure is critical for efficiency. The rugged construction facilitates primary control or monitoring, and the removable orifice allows for specific flow adjustments based on inlet pressure conditions, which can reach up to 60 PSIG depending on the internal configuration. For contractors, the 121-8-2 offers a dependable, simple-to-service solution for commercial HVACR gas trains and distribution lines.

• Precise Pressure Regulation: The black spring delivers a stable 2-4.25 psi outlet range for medium-pressure requirements.
• High Flow Capacity: Large 2-inch NPT connections minimize pressure drop across the valve while maximizing SCFH throughput.
• Durable Construction: Combines a cast iron body with a non-corrosive aluminum diaphragm case for longevity in demanding environments.
• Rapid Response: Roll-type diaphragm design provides nearly instantaneous adjustment to varying load demands.
• Versatile Compatibility: Standardized for use with natural gas, LPG, and air systems.

• What is the shipping weight of the Sensus 121-8-2? As a heavy industrial component, this 2-inch regulator typically weighs approximately 33 lbs, requiring secure mounting.
• Can the outlet pressure be adjusted beyond 4.25 psi? This specific unit is optimized for the 2-4.25 psi range using the black spring; different springs are required for other pressure thresholds.
• Is this regulator suitable for outdoor installation? Yes, provided it is installed in the correct orientation and the vent is properly protected from moisture and debris.

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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.