Maxitrol MR212G-2020 Gas Valve

The Maxitrol MR212G-2020 is a high-capacity 2 1/2" NPT negative pressure modulator regulator valve specifically engineered for direct fired burners in pull-through applications. Built for precision in industrial and commercial make-up air systems, this Maxitrol Selectra series component handles a 5 PSI maximum inlet pressure and eliminates the need for a separate upstream regulator. By utilizing a specialized counter spring, the MR212G-2020 remains closed against the downward force of negative pressure until the solenoid receives voltage, ensuring safe and accurate gas flame modulation. This valve is field adjustable for negative pressures up to -3.5” w.c., allowing for a stable minimum firing rate via its integral bypass. Its brass construction and Buna-N diaphragm provide the durability required for process heating control. For contractors performing retrofits or new installations, this valve provides instantaneous response times to maintain constant discharge air temperatures without the complexity of motorized butterfly valves.

• Dual Functionality: Performs both gas flow modulation and pressure regulation in a single 2 1/2" NPT housing.
• Negative Pressure Optimized: Explicitly designed for pull-through burners to prevent unintended opening under vacuum.
• High Capacity: Suited for large-scale industrial gas valves applications requiring up to 30,000 CFH.
• Advanced Temperature Control: Compatible with Selectra Series 14, 24, and 44 systems for non-fluctuating heat output.
• Field Adjustability: Factory set at -1.5" w.c. but adjustable to meet specific site requirements up to -3.5" w.c.

Is an external motor required for this valve to modulate?
No, the Maxitrol MR212G-2020 operates electronically via a solenoid plunger that acts directly on the diaphragm, removing the need for external mechanical motors.

Can this valve be used with Liquefied Petroleum (LP) gas?
Yes, this modulator-regulator is suitable for natural, manufactured, mixed, and LP gas-air mixtures.

What is the proper mounting orientation for the MR212G?
To ensure accurate regulation and vent function, the valve should be mounted in an upright position within a horizontal pipe run.

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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.