Mueller Streamline b33752-450 Relief Valve 450 Psi

Product Description

The MUELLER STREAMLINE b33752-450 is a refrigerant pressure relief valve rated at 450 psi, designed to protect sealed refrigeration and air conditioning systems from overpressure conditions. It features a 1/4-inch male NPT inlet and a 3/8-inch flare outlet, allowing it to integrate directly into refrigerant circuit piping. When system pressure exceeds the rated threshold, the valve opens to release refrigerant and prevent equipment damage or catastrophic failure. This valve is installed by licensed HVAC-R technicians and refrigeration mechanics working on commercial and residential refrigeration equipment.

The b33752-450 is suited for use in refrigeration systems where code or equipment design requires a dedicated pressure relief device. Typical applications include refrigeration compressor circuits, condensing units, and pressure vessels operating with common refrigerants. The 1/4-inch NPT x 3/8-inch flare configuration accommodates standard copper tubing and threaded fittings found in most refrigeration installations.

Key Features

• 450 psi pressure relief rating protects refrigerant systems from overpressure
• 1/4-inch male NPT inlet for direct threaded connection to system piping
• 3/8-inch flare outlet for connection to standard copper refrigerant tubing
• Designed for refrigerant service in sealed HVAC-R and refrigeration circuits

Compatibility

Designed as an OEM-style replacement or new-installation pressure relief valve for refrigeration and air conditioning systems requiring a 1/4-inch MPT x 3/8-inch flare relief valve rated at 450 psi.

Installation Notes

Installation must be performed by an EPA Section 608 certified HVAC-R technician. Recover all refrigerant and depressurize the system before removing or installing any pressure relief component. Apply appropriate thread sealant rated for refrigerant service to the NPT threads and verify the flare connection is properly torqued using standard flare nut procedures. Confirm final installation complies with applicable mechanical codes and equipment manufacturer specifications.

Technical Specifications

• Inlet Size: 1/4 inches
• Inlet Connection Type: Male NPT
• Outlet Connection Type: 3/8 inches Flare
• Pressure Rating: 450 psi
• Service: Refrigerant

Standard Information

• Brand: MUELLER STREAMLINE
• Manufacturer Part Number: b33752-450