PTFE Face Seal, PTFE Spring Energized Seal For Flange Connection

Commercial Terms of Products:

Overview

Tesel Seal designs and manufactures PTFE H-type flange sealing rings engineered for API 6D valve flange connections in demanding oil, gas, petrochemical, and LNG applications. These seals provide reliable performance under extreme pressure, temperature variation, and aggressive media conditions.

The sealing system combines PTFE or high-performance polymer jackets with H-type, V-type, or C-type spring designs, delivering stable sealing force and adaptability to different operating requirements.

Operating from -196°C to 250°C and up to 2500 LB, with capability up to 20,000 psi in API 6A applications, Tesel Seal provides customized sealing solutions for flange connections requiring long-term reliability and minimal maintenance.

Technical Specifications

Key Features and Performance Advantages

• Wide Temperature Capability – Maintains sealing performance from -196°C to 250°C, supporting cryogenic and elevated temperature applications.

• High Pressure Performance – Designed for API 6D pressures up to 2500 LB and API 6A ball valve pressures up to 20,000 psi, ensuring consistent sealing under steady-state and fluctuating loads.

• Spring Versatility – Supports H-type, V-type, and C-type springs to meet diverse application requirements and operational loads, including scenarios with high backpressure or dynamic cycling.

• Robust Sealing Design – Multi-lip and composite structure ensures continuous contact and redundancy at flange interfaces, mitigating leakage risk and providing performance stability under mechanical stress.

• Chemical Resistance – Materials including PTFE and high-performance polymers are compatible with H2S, CO2, hydrocarbons, and aggressive chemicals, preventing chemical degradation over extended service intervals.

• Easy Installation – Engineered for quick assembly, reducing operational downtime and simplifying maintenance procedures.

• Low Friction & Extended Service Life – Optimized material selection and spring configuration reduce wear on mating surfaces, extending service life and minimizing energy loss.

• Structural Stability – Top and bottom support rings maintain alignment, prevent extrusion, and provide dimensional stability under fluctuating pressures and thermal cycles.

• Redundant Sealing Interfaces – Multi-lip configuration ensures multiple contact points, increasing sealing reliability and operational safety, especially in high-value critical process equipment.

Product Structure and Design

Tesel Seal flange face H-type sealing rings are designed as composite systems for flange connections, including:

• PTFE or high-performance polymer sealing jacket – Provides primary sealing and chemical resistance.
• H-type, V-type, or C-type spring – Supplies continuous radial sealing force and compensates for wear.
• Support rings – Reinforced top and bottom rings maintain structural integrity and prevent extrusion.
• Multi-lip interfaces – Ensures redundancy and stable sealing performance across varying operating conditions.

This integrated design accommodates dynamic flange movements, pressure surges, and thermal expansion, making it highly suitable for API 6D valve applications, petrochemical systems, and cryogenic LNG processes.

Applications

Tesel Seal flange face H-type sealing rings are widely used across multiple industries:

• API 6D Valve Flanges – Maintain leak-tight sealing at flange interfaces under high-pressure conditions.
• Oil & Gas Pipelines – Suitable for upstream, midstream, and downstream systems where pressure containment is critical.
• LNG Systems – Cryogenic applications maintaining integrity under extreme low-temperature conditions.
• Petrochemical Process Equipment – Handles aggressive chemicals and high temperatures in pumps, reactors, and valves.
• Industrial Flange Connections – Suitable for chemical, power, and processing industries requiring robust end-face sealing.
• Wellhead and Offshore Equipment – Ensures reliability under dynamic mechanical stress, saltwater exposure, and corrosive environments.

Design Considerations

When selecting flange face H-type seals, consider:

• Pressure Conditions – Maximum operating pressure, cyclic loads, and API 6D or 6A performance requirements.
• Temperature Range – Cryogenic to high-temperature environments impacting material performance.
• Media Compatibility – Hydrocarbons, H2S, CO2, chemical additives, and aggressive process fluids.
• Spring Type – H-type, V-type, or C-type selected based on pressure, installation, and operational loads.
• Sealing Redundancy – Multi-lip configuration recommended for high-pressure or critical applications.
• Installation Constraints – Flange geometry, gland depth, and space limitations.

Failure Analysis and Optimization

• Extrusion Risk Under Pressure – Backup rings prevent PTFE or polymer extrusion under high-pressure conditions, maintaining sealing integrity.

• Wear and Abrasion – Dynamic flange motion and repeated assembly cycles can lead to material wear. Proper spring energization and material choice reduce frictional loss.

• Thermal Fatigue – Repeated temperature cycling may create micro-cracks or loss of elasticity; multi-lip design distributes stress and enhances durability.

• Chemical Degradation – PEEK, PTFE, and high-performance polymers resist aggressive fluids, including H2S, CO2, and hydrocarbons, preventing long-term chemical attack.

• Installation Misalignment – Correct tolerances, spring pre-load, and assembly guidance from Tesel Seal ensures optimal sealing performance and reliability.

Optimization involves selecting the appropriate spring type, multi-lip design, backup/support ring integration, and field validation under real operating conditions.

Common Questions and Answers

• Can this seal handle cryogenic temperatures? – Yes, effective from -196°C to 250°C, suitable for LNG applications.

• Are H-type, V-type, and C-type springs interchangeable? – Yes, based on operational load and installation requirements.

• Can the seal withstand API 6A high pressures? – Yes, rated up to 20,000 psi with backup rings preventing extrusion.

• Is customization available? – Tesel Seal provides tailored solutions for specific flange geometries, operating media, and temperature/pressure conditions.

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