4" Weco Hammer Union Seal (Brass Insert & Buna-N) | Heavy-Duty Anti-Extrusion Seal Ring

The 4" Weco Hammer Union Seal featuring a precision-machined Brass insert and Buna-N (Nitrile) elastomer is a highly robust sealing solution engineered specifically for extra-large-bore, high-volume flowline applications. Designed to fit seamlessly into standard 4-inch Weco-style hammer unions—including standard Figure 1002, 1502, and 602 profiles—this heavy-duty composite seal ring provides critical protection against fluid bypass and catastrophic blowout in operations requiring massive fluid transfer rates.

The core sealing element is molded from high-grade Buna-N (Nitrile / NBR), delivering dependable, standard-service resistance to petroleum-based fluids, water, and abrasive drilling muds. The defining feature of this seal is its integrated, rigid Brass Anti-Extrusion Ring. In 4-inch flowlines, the surface area exposed to internal pressure is significantly larger, magnifying the risk of elastomer extrusion. During extreme pressure spikes and high-velocity fluid transfers, this non-sparking metallic backup ring structurally reinforces the elastomer lip, completely preventing it from extruding into the clearance gap of the union.

Ideal for operators seeking maximum reliability in their largest flowline setups, this 4" Brass/Buna Weco seal provides the essential extrusion resistance required for safe, high-capacity cementing, circulating, and fluid transfer operations.

Features & Benefits

• Brass Anti-Extrusion Ring: Integrated metal backing prevents elastomer extrusion and blowout under the severe pressure surges and massive fluid volumes typical of 4-inch lines.

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

• Large-Bore Reliability: Specifically engineered to handle the increased radial forces and flow velocities present in extra-large 4-inch flow control systems.

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

• Exact Fitment: Precision manufactured to ensure a perfect, drop-in fit for standard 4" Weco-style hammer unions, allowing for rapid in-field replacements without downtime.

Specifications & Technical Details

Applications

This 4" Brass/Buna Weco Seal is recommended for standard service, large-diameter flowline environments where high flow volumes and structural integrity are critical. Typical applications include high-capacity mud circulating lines, heavy-duty cementing manifolds, large-scale water transfer lines, pump suction/discharge lines, and general well-servicing equipment requiring robust blowout protection.

Quality Assurance

These extra-large bore seals are subjected to strict quality control protocols. We meticulously verify the Buna-N durometer (hardness) and dimensionally inspect the brass anti-extrusion rings to ensure they meet the rigorous tolerance standards necessary to protect your field personnel and large-scale flowline infrastructure.

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