3" Fig 1502 Relief Valve Assembly | 15,000 PSI High-Pressure Safety Valve

The 3" Figure 1502 Relief Valve Assembly is a mission-critical safety device engineered to protect high-volume, high-pressure pumping equipment, large-bore flowline manifolds, and field personnel from catastrophic overpressure events. Designed to seamlessly integrate into standard 3-inch 15M iron spreads, this heavy-duty assembly acts as a fail-safe mechanical fuse for high-rate pumping operations. Rated for up to 15,000 PSI Cold Working Pressure (15M CWP), the valve is calibrated to automatically "pop" open and instantly vent massive volumes of fluid or gas if system pressure exceeds a pre-determined, safe limit, preventing structural rupture of primary pipelines and wellhead equipment.

The core of this 3-inch assembly is its robust Adjustable Spring-Loaded Mechanism (or nitrogen-charged system). This allows operators to precisely set the pop-off release pressure according to the specific safety margins of their current operation. Because it is built for 3-inch lines, the internal porting is significantly larger than its 2-inch counterpart, allowing for rapid dissipation of fluid energy during a severe pressure spike, such as a screen-out. Once the excess pressure is safely vented away from the main line, the internal spring mechanism automatically reseats the valve, restoring the system's pressure boundary so operations can quickly and safely resume.

Constructed from premium forged alloy steel to withstand abrasive fluids and the immense kinetic energy of high-rate flow, the assembly features standard 3-inch Figure 1502 hammer union connections for fast, vibration-resistant installation. In high-rate hydraulic fracturing and extreme-pressure cementing jobs, utilizing a reliable, high-capacity 3-inch relief valve assembly is an absolute safety mandate.

Features & Benefits

• 15,000 PSI Working Pressure (15M): Engineered to safely contain and operate within extreme high-pressure upstream environments up to 15,000 PSI CWP.

• High-Volume Overpressure Relief: Features an enlarged 3-inch bore design to rapidly discharge massive volumes of fluid when system pressure exceeds the set point, preventing dangerous blowouts.

• Adjustable Set Pressure: The field-adjustable mechanism allows technicians to fine-tune the pop-off threshold to match the specific pressure limits of the well program.

• Automatic Reseating: Once the critical pressure spike is vented, the internal spring forces the valve closed again, quickly securing the system.

• Rugged Forged Construction: Machined from high-strength alloy steel to absorb the severe shock, vibration, and fluid erosion associated with high-velocity emergency venting.

• 3" Fig 1502 Hammer Unions: Ensures rapid, highly secure, and leak-free makeup into existing 3-inch high-pressure treating iron networks.

Specifications & Technical Details

Applications

This 3" Fig 1502 Relief Valve Assembly is a mandatory safety component for high-rate, high-pressure pumping operations. It is typically installed directly on high-pressure frac pump discharge fluid ends, integrated into the primary 3-inch treating iron manifold (missile) before the wellhead, utilized in large-bore choke-and-kill safety loops, and deployed during operations where sudden pressure blockages pose a severe risk to heavy equipment and human life.

Quality Assurance

Because it is a life-saving safety device, each 3-inch relief valve assembly undergoes the industry's most rigorous quality assurance testing. This includes high-pressure hydrostatic body shell testing, multiple dynamic "pop-off" tests to verify the accuracy and repeatability of the release mechanism, magnetic particle inspection (MPI) on all pressure-containing welds and forgings, and complete material traceability (MTRs) to ensure strict API and OSHA safety compliance.

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