4" Weco Hammer Union Seal (Viton / Black) | High-Temp & Sour Service Elastomer

The 4" Weco Hammer Union Seal manufactured from premium Black Viton® (FKM) is an elite, heavy-duty sealing solution designed for extra-large-bore flowline environments that demand exceptional chemical and thermal resilience. Engineered for a precise, drop-in fit into standard 4-inch Weco-style hammer unions—including Figure 602, 1002, and 1502 profiles—this specialized elastomer ring provides an impenetrable pressure barrier against volatile, high-volume, and corrosive fluids in severe-service applications.

While molded in the industry's standard black color—which visually resembles standard Buna-N seals—this component is constructed entirely from high-performance Viton® (Fluorocarbon / FKM). It is specifically intended for operators who require the unparalleled chemical and high-temperature resistance of FKM but prefer or require a standard black elastomer for their inventory or equipment standardization protocols. This seal provides maximum defense against elevated temperatures, synthetic drilling muds, sour gas (H2S), and aggressive completion chemicals that would quickly destroy standard rubber compounds in massive 4-inch flowlines.

Featuring a highly efficient, pressure-energized lip design, the seal actively expands against the union’s mating surfaces as massive internal line pressure increases. This dynamic action guarantees a tight, blowout-proof connection under the severe vibrations and massive fluid velocities typical of 4-inch, high-capacity well-servicing operations.

Features & Benefits

• Premium Viton® (FKM) Elastomer: Delivers maximum resistance to high temperatures, volatile petrochemicals, and aggressive stimulation fluids encountered in heavy-duty operations.

• Standard Black Finish: Ideal for facilities standardizing on black elastomers while still requiring top-tier FKM performance for severe service (proper inventory segregation recommended).

• Sour Service Ready: Specifically formulated to withstand the degrading and embrittling effects of hydrogen sulfide (H2S), ensuring safe operation in high-volume sour gas environments.

• Pressure-Energized Geometry: Utilizes massive internal flowline pressure to actively push the sealing lips outward against the metal union faces, strengthening the dynamic seal as pressure surges.

• Extra-Large Bore Fitment: Manufactured to rigorous dimensional tolerances for a seamless, zero-clearance fit in standard 4" Weco-style hammer unions (including Fig 602, 1002, and 1502 profiles).

Specifications & Technical Details

Applications

The 4" Black Viton Weco Seal is engineered for severe-service, large-scale flowline systems. It is critical for high-capacity sour gas (H2S) well servicing, heavy-duty high-temperature pump discharge lines, acidizing manifolds, severe-duty fracturing operations, and any extra-large-bore infrastructure where maximum chemical and thermal resistance is required without the need for specialized color-coding.

Quality Assurance

Every batch of our 4-inch Black Viton union seals undergoes rigorous quality control testing to verify precise dimensional accuracy, correct durometer (hardness), and proper FKM chemical composition. This ensures reliable, long-lasting performance and maximizes field safety during critical, high-volume operations.

Request a Quote

📞 +1 405 666 5011

📧 seo@blazess.com