Mueller AD15504 Relief Valve

The Mueller AD15504 Relief Valve is a straight-thru pressure relief valve engineered for critical overpressure protection in commercial refrigeration and industrial systems. With a factory set pressure of 235 PSI, this Mueller Safetymaster valve features a 1/2" NPT inlet and a 5/8" flare outlet connection. Designed mainly for liquid receiver applications above the liquid refrigerant level, it ensures high-volume discharge capacities to protect your pressure vessels from catastrophic failure. This HVACR pressure relief device is fully compatible with all CFC, HCFC, and HFC refrigerants and oils, including R-410A. Built with a robust, corrosion-resistant brass body, the AD15504 operates within a continuous operating temperature range of -40°F to 300°F. It satisfies ASHRAE Standard 15 code requirements and is certified by the National Board of Boiler and Pressure Vessel Inspectors, ensuring your system remains ASME code compliant during peak operation. For contractors, this is a tamper-evident, non-adjustable safety component with internal staking to prevent unauthorized field recalibration.

• Broad Refrigerant Compatibility: Fully operational with modern HFCs and legacy CFC/HCFC refrigerants for versatile field application.
• Code-Compliant Safety: Certified by the National Board (NB) and meets ASHRAE 15 and ASME Section VIII standards for unfired pressure vessels.
• High-Temperature Resilience: Engineered to withstand extreme thermal conditions from -40°F up to 300°F without compromising seat integrity.
• Precise Pressure Regulation: High-volume discharge capacity ensures rapid pressure equalization in emergency overpressure scenarios.
• Tamper-Resistant Construction: Internal components are staked into position to maintain factory 235 PSI settings and prevent field errors.

Is the Mueller AD15504 compatible with R-410A systems?
Yes, this refrigeration safety valve is rated for use with high-pressure refrigerants including R-410A, provided the system's maximum design pressure aligns with the 235 PSI rating.

Where should this relief valve be installed on a receiver?
Technicians should install the straight-thru relief valve in the vapor space of the liquid receiver, strictly above the liquid refrigerant level, to ensure proper vapor discharge during an overpressure event.

Can the pressure setting be adjusted in the field?
No. The Mueller AD15504 features a fixed 235 PSI setting and is designed with tamper-evident internal staking. If a different pressure setting is required, the entire valve must be replaced with the correctly rated model.

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.