Mueller Industries BD34519 Valve

The Mueller Industries BD34519 is a high-performance refrigerant relief valve engineered for critical over-pressure protection in commercial HVACR systems. Specifically designed for liquid receiver applications, this 235 PSI relief valve ensures system integrity by venting excess pressure before it reaches hazardous levels. Featuring a 1-5/16" NPT inlet and an NPTFI outlet, the BD34519 (identical to model B34519-235) provides a robust straight-thru flow path, minimizing pressure drop during discharge. This ASME safety relief valve is constructed with a durable brass body and stainless steel spring, making it compatible with all major CFC, HCFC, and HFC refrigerants, including R-410A. Its PTFE seating ensures a tight seal and reliable reseat after activation, maintaining ASHRAE Standard 15 compliance for pressure vessel safety. For contractors, this Mueller Safetymaster valve is the industry standard for protecting receivers and high-side components from thermal expansion or compressor discharge surges.

• Internal 235# Set Pressure: Factory-calibrated to 235 PSI, providing precise protection for medium-pressure refrigerant vessels.
• Multi-Refrigerant Compatibility: Fully rated for modern refrigerants and oils, ensuring versatile use across various HVACR refrigeration platforms.
• Heavy-Duty Construction: Features a corrosion-resistant brass body and a rugged spring designed for a continuous operating temperature range of -40°F to 300°F.
• Regulatory Compliance: Meets ASME Section VIII requirements and is National Board certified for discharge capacity.
• Drop-In Replacement: Directly replaces the B34519-235, maintaining identical port dimensions and flow characteristics for fast field installation.

What is the difference between the BD34519 and the B34519-235?
Technically, they are the same component. The "BD" prefix corresponds to Mueller’s specific distribution coding, but the physical specifications, 235 PSI set point, and connection sizes are identical.

Can this valve be used on the suction side of the system?
This valve is primarily designed for high-side application on liquid receivers above the liquid level. Using it on the suction side depends on local codes and system design; always verify the MAWP of the vessel being protected.

Does the BD34519 require a rupture disc?
While not always required by code, pairing this pressure relief valve with a compatible rupture disc is a best practice to prevent refrigerant weeping and to provide a visual indication of a high-pressure event.

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.