Maxitrol MR510-3/4 Valve

The Maxitrol MR510-3/4 is a professional-grade 3/4" NPT Modulating Gas Valve designed for precision fuel regulation in atmospheric burners. As a critical component of the Selectra Series 20 electronic gas flame modulation system, this valve provides a linear relationship between control signals and flow rates, ensuring stable discharge air temperatures. Engineered for indirect-fired units, it handles a 1/2 PSI maximum inlet pressure and functions as both a modulator and a high-performance gas pressure regulator. HVAC technicians rely on the MR510 for its ability to maintain precise manifold pressure without the mechanical hysteresis or "hunting" often associated with lower-quality alternatives. Whether you are performing a field installation or replacing a failed unit in a commercial furnace, this valve supports all fuel gases, including natural gas and LP air mixtures. Its 24V DC operation allows for infinite, non-fluctuating flame adjustment, delivering consistent heat output for space heating and light industrial HVACR applications.

• Dual Functionality: Integrates modulation and pressure regulation into a single 3/4" NPT housing for simplified piping.
• Broad Compatibility: Fully compatible with Selectrastat selectors and Series 20 amplifiers for seamless system integration.
• Technical Precision: Designed specifically for indirect fired atmospheric burners with a repeatable 5:1 turndown ratio.
• Rugged Build: rated for 0.5 PSI inlet pressure, providing reliable performance in commercial heating environments.
• Linear Control: Eliminates the need for external motors or large butterfly valves by utilizing a direct DC voltage control signal.

What is the maximum inlet pressure for this model?
The MR510-3/4 is rated for a maximum inlet pressure of 1/2 PSI (approx. 14" w.c.).

Can this valve be used with Propane/LP gas?
Yes, it is designed for use with natural, manufactured, mixed, and liquefied petroleum gases.

In what orientation should the valve be installed?
The valve must be installed in an upright position within a horizontal run of pipe to ensure proper diaphragm operation.

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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.