Maxitrol 325-3-1/2 Regulator

For professional HVAC contractors, the Maxitrol 325-3-1/2 is a high-performance gas pressure regulator engineered for medium-pressure piping systems. This 1/2" NPT unit features a lever acting design that provides positive dead-end lock-up, ensuring stable downstream pressure even under no-flow conditions. Rated for a 10 PSI max inlet pressure, this 325 series model is versatile, handling a 100,000 BTU/hr max individual load and up to 150,000 BTU/hr max multiple load for combined appliance applications. It is calibrated with a violet spring for a 4-12"wc outlet pressure range, making it a reliable solution for residential and light commercial equipment. Note that the 325-3-1/2 is technically identical to the 325-3-44, offering a drop-in replacement for the same mechanical specifications. This regulator is suitable for natural, manufactured, mixed, and liquefied petroleum gases, as well as LP gas-air mixtures.

• Dead-End Lock-Up Performance: The high-leverage valve linkage ensures positive dead-end lock-up, protecting downstream equipment from pressure creep.
• Versatile Application: Certified as a pounds-to-inches regulator, it efficiently reduces medium distribution pressures to appliance-compatible levels.
• Mounting Flexibility: Supports multi-poise installation; however, if a vent limiting device is added, the 325-3-1/2 must be mounted in an upright horizontal position.
• Precise Control: Capable of maintaining accurate pressure regulation from full flow all the way down to sensitive pilot flow demands.

• How do I select the right spring for the Maxitrol 325-3 series? This specific model comes standard with a 4-12" w.c. range (violet spring). For different pressure requirements, such as 7-11" w.c. or 1-2 PSI, specific springs like the R325C10-P12 must be used.
• Can this be used for propane (LP) applications? Yes, the Maxitrol 325-3-1/2 is compatible with LP and LP-air mixtures, provided the inlet and outlet pressures are within the specified ratings.
• Is a vent limiter included with the 325-3-1/2? Typically, standard 325-3 models require a separate 12A09 vent limiter if they are not the "L" (Line) factory-certified versions. Always check local codes for venting requirements.

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.