Maxitrol R400-3/8 Regulator

The Maxitrol R400-3/8 is a professional-grade appliance gas regulator designed specifically for main burner and pilot load applications. Featuring a double diaphragm balanced valve design, this unit excels at maintaining a steady outlet pressure despite significant fluctuations in the inlet supply. This balanced valve gas regulator is identical to the R400-3/8-CSA model, providing 3/8" NPT connections and a versatile aluminum die-cast housing suitable for high-performance HVAC gas pressure regulation in both infrared heaters and industrial boiler pilot lines.

For field installations, the gas regulator flow capacity and pressure ratings are critical. This unit is CSA certified for a 1/2 PSI maximum inlet pressure, though it has been Maxitrol tested to withstand up to 1 PSI. The pre-installed plated spring provides an adjustable outlet pressure range of 3-6" w.c., ensuring precise control for sensitive appliance manifolds. Its compact footprint does not sacrifice performance, making it a standard choice for contractors requiring a reliable natural gas regulator or LP gas regulator that handles multi-positional mounting without compromising accuracy.

• Precise Pressure Control: The double diaphragm architecture eliminates inlet pressure effects, ensuring the burner receives consistent gas flow.
• Multi-Poise Installation: Rugged aluminum construction allows for various mounting orientations, though upright is recommended when using vent limiters.
• Broad Compatibility: Rated for natural, manufactured, mixed, and liquefied petroleum gases, as well as LP gas-air mixtures.
• Extreme Durability: Engineered to operate in ambient temperatures ranging from -40°F to 205°F for demanding mechanical rooms.

Is the R400-3/8 suitable for dead-end lockup service?
No, the R series is a non-lockup design intended for continuous pilot or main burner loads. It should not be used as a line regulator for appliances with electronic ignition unless the downstream valve can open against full line pressure.

Can I use this regulator for a zero governor application?
The standard R400-3/8 is set for 3-6" w.c. For zero governor requirements, refer to the R400Z models which utilize a counter spring for specialized air-gas mixing applications.

What happens if the inlet pressure exceeds 1/2 PSI?
While CSA certified to 1/2 PSI, the unit is tested to 1 PSI. If your system exceeds these limits, you must install a dedicated overpressure protection device to prevent internal diaphragm damage.

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.