3" Weco Hammer Union Seal (Brass Insert & Buna-N) | High-Pressure Anti-Extrusion Seal Ring

The 3" Weco Hammer Union Seal featuring a precision-machined Brass insert and premium Buna-N (Nitrile) elastomer is a heavy-duty sealing solution engineered to withstand the extreme pressures and high flow rates of demanding oilfield environments. Designed for a precise, drop-in fit into standard 3-inch Weco-style hammer unions, including the industry-standard Figure 1502, this composite seal ring provides vital protection against fluid bypass and catastrophic seal blowout.

The core of this seal is molded from high-grade Buna-N (Nitrile / NBR), delivering dependable resistance to petroleum-based fluids, water, synthetic lubricants, and abrasive drilling muds. What sets this seal apart is the integration of a rigid, non-sparking Brass Anti-Extrusion Ring. During extreme pressure surges and high-velocity fluid transfers common in 3-inch flowlines, this metallic backup ring structurally reinforces the elastomer lip. It entirely prevents the rubber from extruding into the clearance gap between the male and female union subs, ensuring a continuous, blowout-proof connection.

Ideal for operators requiring maximum reliability in standard service flowlines, this 3" Brass/Buna Weco seal is the premier choice for protecting high-volume, high-pressure infrastructure.

Features & Benefits

• Brass Anti-Extrusion Ring: Integrated machined metal backing reinforces the seal structure, preventing elastomer extrusion and blowout under severe pressure spikes and high flow rates.

• Premium Buna-N Elastomer: Formulated from high-quality Nitrile rubber for excellent resistance to oil, gas, water, and abrasive fracturing or drilling fluids.

• Pressure-Energized Geometry: Utilizes internal line pressure to actively expand the sealing lips against the union's mating surfaces, establishing a dynamic seal that strengthens as operational demands increase.

• High-Volume Capacity: Specifically engineered for the increased fluid velocities and dynamic stresses present in 3-inch flowline assemblies.

• Exact Fitment: Precision manufactured to ensure a perfect, zero-clearance fit for standard 3" Weco-style hammer unions (specifically Fig 1502 profiles).

Specifications & Technical Details

Applications

This 3" Brass/Buna Weco Seal is highly recommended for standard service flowline environments where high flow volumes and extreme pressures are present. Typical applications include high-capacity cementing and circulating lines, fracturing manifolds, high-pressure pump discharge lines, well-testing equipment, and large-bore fluid transfer assemblies where extrusion resistance is non-negotiable.

Quality Assurance

Every composite hammer union seal undergoes strict batch-testing protocols. We verify the Buna-N durometer (hardness) and dimensionally inspect the brass anti-extrusion rings to ensure they meet the rigorous tolerance standards necessary. The final assembly is evaluated for perfect cohesion between the metal insert and the elastomer to guarantee reliable field performance.

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