Maxitrol R500S-3/4 Regulator

The Maxitrol R500S-3/4 is a professional-grade gas appliance pressure regulator engineered for high-performance control in light industrial and commercial heating systems. Featuring a double diaphragm balanced valve design, this 3/4" NPT regulator maintains a steady outlet pressure even when subjected to fluctuating inlet pressures up to 1/2 PSI (Maxitrol tested). It is specifically built for applications requiring precise regulation at both full burn and pilot loads, making it a reliable choice for infrared heaters, pilot lines, and boilers.

Constructed with a rugged aluminum die-cast housing and corrosion-resistant internal components, the Maxitrol R500S-3/4 is suitable for natural, manufactured, mixed, and LP gases. The 3-6" w.c. outlet pressure range provides the sensitivity needed for standing pilot systems and modern burner manifolds. This unit is CSA certified to ANSI Z21.18 standards and supports multi-positional mounting, though an upright orientation is required when using a vent limiting device. Tech Tip: While excellent for low-flow control, avoid using this as a primary line regulator for electronic ignition systems unless the control valve is rated to open against line pressure.

• Double Diaphragm Technology: Ensures superior regulation and eliminates inlet pressure effects on the valve.
• High Capacity, Compact Footprint: Provides exceptional flow characteristics in a space-saving 3/4" NPT aluminum body.
• Universal Fuel Compatibility: Approved for use with Natural Gas, Propane (LP), and LP gas-air mixtures.
• Versatile Application: Ideal for pilot line regulation on large industrial heaters or main burner control on commercial appliances.
• Extreme Temperature Resilience: Rated for ambient performance from -40° to 205°F, suitable for demanding mechanical rooms.

• Can this regulator be used for "dead-end" lockup service? No, the R500S series is not designed for lockup; it is intended for continuous flow or pilot load applications.
• Is a vent limiter included or required? This model has a 1/8" NPT vent; for indoor installations without a vent line, a Maxitrol vent limiting device (like the 12A04) may be required by local code.
• Can I change the outlet pressure beyond 6" w.c.? Yes, the pressure range can be modified by swapping the internal spring with other Maxitrol R5210 series springs.

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.