Mueller AI15504 Relief Valve

The Mueller AI15504 Relief Valve is a veteran-grade SafetyMaster pressure relief valve designed for mission-critical overpressure protection in commercial refrigeration and HVAC systems. Engineered for high-side application on liquid receivers, this straight-through 425 PSI PRV features a 1/2-inch NPTFE inlet and a 5/8-inch flare outlet connection. The brass body construction, paired with a stainless steel spring and a resilient neoprene seat disc, ensures consistent HVAC system pressure protection across a wide temperature range of -40°F to 300°F.

This refrigerant relief valve is fully compatible with all common fluorinated refrigerants (CFC, HCFC, and HFC) and their associated oils. Each unit is individually hand-calibrated and tested, featuring discharge rates certified by the National Board of Boiler and Pressure Vessel Inspectors. For contractors, the Mueller AI15504 offers a reliable, leak-proof solution that meets ASHRAE Standard 15 and ASME code requirements for unfired pressure vessels, ensuring your installs remain compliant and secure under high-demand refrigeration pressure safety conditions.

• Broad Compatibility: Rated for use with a wide range of refrigerants, including R-22, R-134a, R-404A, and R-410A.
• Precise Calibration: Factory-set at 425 PSI to prevent equipment damage and ensure personnel safety.
• Durable Infrastructure: Heavy-duty brass body and corrosion-resistant stainless steel components withstand harsh industrial environments.
• Certified Performance: Discharge capacities are National Board certified, satisfying stringent ASHRAE Standard 15 safety codes.
• Compact Profile: The straight-through design allows for easy integration into tight mechanical spaces on refrigerant vessels.

What is the flow capacity of the AI15504?
The valve is rated for a flow capacity of approximately 35.6 lb/min of air, providing rapid pressure discharge during an overpressure event.

Can this valve be mounted below the liquid level?
No, these 425 PSI relief valves are specifically designed for use on liquid receivers above the liquid refrigerant level to ensure proper gas discharge.

Is the outlet connection NPT or Flare?
This specific model features a 5/8-inch female flare outlet, requiring a compatible flare fitting for the discharge line, while the 1/2-inch inlet uses NPTFE threading.

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.