RX-37 Ring Joint Gasket (Low Carbon Steel) | API 6A / ASME B16.20 Pressure-Energized Flange Seal

The RX-37 Ring Joint Gasket (RTJ) manufactured from premium Low Carbon Steel is an advanced, high-performance metallic sealing component engineered for high-pressure oil, gas, and petrochemical applications. While designed to fit seamlessly into standard R-37 API 6B flange grooves (typically found on 3-1/8" 2M, 3M, and 5M flanges), the RX-series features a unique, asymmetrical cross-section. This specialized geometry makes the gasket pressure-energized. As the internal pipeline or wellbore pressure increases, the fluid pressure acts on the inner face of the gasket, expanding it outward and forcing it tighter against the outer wall of the flange groove. This creates an exceptionally robust, dynamic metal-to-metal seal that strengthens as system demands increase.

The defining characteristic of this RX-37 gasket is its Low Carbon Steel metallurgy, designed to provide a perfect seal without causing irreversible damage to expensive flange faces. The gasket material must be softer than the flange itself to ensure the gasket yields first. This Low Carbon Steel gasket is strictly manufactured with a maximum hardness of 120 HB (Brinell). During the torqueing process, the softer gasket undergoes controlled plastic deformation, flowing into the microscopic imperfections of the flange groove to establish a bubble-tight barrier. To prevent rust and degradation during storage and prior to installation in standard-service environments, the low carbon steel is treated with a protective zinc or cadmium anti-corrosive plating.

Engineered in strict compliance with API 6A and ASME B16.20 specifications, the RX-37 gasket provides extreme reliability, enhanced pressure containment, and unmatched sealing performance for critical infrastructure subject to heavy vibrations and severe pressure shocks.

Features & Benefits

• Pressure-Energized Sealing: The asymmetrical RX profile utilizes internal system pressure to increase the sealing force against the flange groove, making it highly effective for extreme-pressure environments.

• API & ASME Compliant: Manufactured to strict API 6A and ASME B16.20 dimensional and material standards, ensuring perfect fitment in R-37/RX-37 flange grooves.

• Controlled Hardness: Heat-treated to a maximum hardness of 120 HB (68 HRB) to guarantee the gasket deforms before the flange groove, protecting expensive pipeline equipment from scoring.

• Interchangeable Design: Designed to fit directly into standard, flat-bottomed R-type flange grooves, allowing for a direct upgrade in sealing performance without replacing the flanges.

• Corrosion Protection: Treated with a standard zinc or cadmium plating to prevent surface rust and oxidation prior to deployment in the field.

Specifications & Technical Details

Applications

This RX-37 Low Carbon Steel Ring Gasket is essential for establishing secure, dynamic flanged connections across the energy sector. Typical applications include sealing API 6B wellhead and Christmas tree flanges, high-pressure pipeline tie-ins, heavy-duty gate and choke valve manifolds, and any standard-service application subjected to severe pressure fluctuations, pump vibrations, or shock loads.

Quality Assurance

Each RX ring joint gasket undergoes stringent quality control testing. This includes rigorous dimensional inspections to ensure exact API/ASME asymmetrical sizing, surface finish evaluations to guarantee a smooth sealing face, and mandatory hardness testing (Brinell/Rockwell) to verify the material is within the acceptable softness range to protect field flanges.

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