Campbell rv3nlf 3/4 Inch Brass Pressure Relief Valve 75 Psi

Product Description

The CAMPBELL rv3nlf is a nonadjustable brass pressure relief valve factory-set to open at 75 psi. It is designed to protect hydronic, potable water, and process water systems from overpressure events caused by thermal expansion or system pressure imbalances. The valve body is constructed from red brass, which meets low-lead requirements for potable water service. The MNPT x FNPT end configuration allows direct inline installation without additional fittings in most standard piping layouts. Licensed plumbers install this valve as a fixed-point overpressure safety device in both new construction and retrofit applications.

This relief valve is suited for residential and light commercial plumbing and hydronic systems where a fixed 75 psi relief point is required. Typical applications include domestic hot water systems, boiler loop bypass protection, pump discharge lines, and closed-loop hydronic heating circuits where thermal expansion can drive pressure beyond safe operating limits. The 3/4 inch nominal size fits standard pipe runs common in residential and small commercial installations.

Key Features

• Factory-set relief point at 75 psi — nonadjustable for consistent, repeatable performance
• Red brass body construction meets low-lead standards for potable water applications
• MNPT x FNPT end configuration for straightforward inline installation
• 3/4 inch nominal size fits standard residential and light commercial piping
• Provides fixed overpressure protection against thermal expansion and pressure spikes

Compatibility

Designed as an OEM-style replacement or new-install pressure relief valve for 3/4 inch threaded piping in residential and light commercial hydronic, potable water, and process water systems requiring fixed 75 psi overpressure protection.

Installation Notes

Installation should be performed by a licensed plumber in accordance with applicable local plumbing codes and IPC guidelines. Shut off system pressure and relieve any residual line pressure before removing or installing the valve. Apply thread sealant or PTFE tape to all threaded connections and confirm joint integrity before returning the system to service. Verify that the discharge port is piped to a safe drain location per code requirements.