Maxitrol MR610-3/4 Valve

The Maxitrol MR610-3/4 is a 3/4" NPT modulating gas valve and integrated regulator designed for atmospheric burners and indirect-fired systems. Engineered for the Maxitrol Selectra Series 20 and 21, this valve executes a dual function, managing both precise modulation and pressure regulation without the need for an external mechanical actuator. It supports a maximum inlet pressure of 1/2 PSI and is critical for applications requiring stable, non-fluctuating temperatures, such as consistent baking, drying, and stabilized area heating. By utilizing a 15-17 VDC control signal, the internal plunger adjusts gas flow across an infinite range of flame settings, while the built-in regulator maintains a steady manifold pressure. This Selectra modulation valve is factory-set for high and low fire but allows for field adjustment to match specific BTU requirements. Its poppet-style design ensures high capacity and reliable performance in horizontal pipe runs.

Key Benefits:

• Integrated Regulation: Performs both modulation and pressure regulation in a single body, eliminating the need for a separate upstream regulator in most manifold stacks.
• Precision Control: Enables infinite, continuous flame adjustment for indirect fired applications, ensuring instantaneous response to temperature fluctuations.
• Solid-State Reliability: Operates without motors or butterfly valves, reducing mechanical wear and simplifying the modulating gas valve wiring process.
• Versatile Fuel Compatibility: Suitable for natural, manufactured, mixed, and liquefied petroleum (LP) gases when used with the appropriate 'H' suffix models.
• High Capacity Design: Pipe size of 3/4" NPT handles significant flow rates found in large commercial atmospheric burners.

Common Questions:

What is the maximum inlet pressure for the MR610-3/4?
The valve is rated for a maximum inlet pressure of 1/2 PSI (approximately 14" w.c.). If your supply pressure exceeds this, a primary regulator must be installed upstream.

Can this valve be mounted in any orientation?
No, for proper operation of the internal plunger and diaphragm, the valve must be installed in an upright position within a horizontal run of pipe.

How do I troubleshoot a lack of modulation?
Check for 0 to 20 VDC at the modulator terminals. Zero volts typically corresponds to high fire, while 15-17 volts represents low fire or bypass. Ensure the plunger is clean and free of debris.

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.