Teflon Lip Seal For Dual Piston Valve Seat Of API 6D Normal Temperature Valve

Commercial Terms of Products:

Overview

Tesel Seal designs and manufactures double piston PTFE seals for API 6D ball valves. These seals ensure reliable performance in dual piston valve seat applications under dynamic motion and pressure fluctuations.

Featuring a back-to-back design with PTFE sealing elements and V-shaped springs, they provide stable sealing force, redundancy, and protection under reverse pressure.

Operating from -50°C to 200°C and up to 2500 LB, ideal for pipelines, LNG systems, and critical valve applications.

Technical Specifications

Key Features and Performance Advantages

• Wide Temperature Capability – Reliable operation from -50°C to 200°C, suitable for both cryogenic and elevated temperature conditions.

• High Pressure Performance – Supports pressures up to 2500 LB while maintaining sealing integrity under steady and fluctuating loads.

• Double Piston Design – Back-to-back piston configuration provides multiple sealing interfaces for improved redundancy and leak prevention.

• V-Spring Energized – Continuous radial force ensures consistent sealing and allows automatic self-relief for overpressure conditions.

• Central Backup Ring – Protects sealing lips under reverse pressure exceeding 1.33× rated pressure.

• Support Ring Integration – Additional top and bottom support rings enhance structural stability and prevent deformation.

• Chemical Resistance – PTFE and PEEK components withstand hydrocarbons, natural gas, H2S, CO2, and other aggressive fluids.

• Low Friction & Extended Service Life – Optimized PTFE surfaces reduce wear and maintenance cycles.

• Redundant Multi-Component Assembly – Combines double pistons, springs, and support rings for reliable performance under dynamic and high-pressure environments.

• Field-Validated Performance – Tesel Seal seals are tested in representative operating conditions for consistent long-term operation.

Product Structure and Design

Tesel Seal ambient temperature double piston PTFE seals are designed as dual back-to-back piston assemblies, forming a high-integrity multi-component sealing system:

• PTFE sealing jackets for primary sealing and chemical resistance
• Stainless steel or alloy V-shaped springs for continuous radial force
• PTFE, PEEK, or metallic support rings for structural stability
• Central backup ring for overpressure protection
• Back-to-back piston arrangement for dual sealing interfaces

This configuration ensures stable sealing under dynamic motion, thermal cycling, and fluctuating pressure, reducing leakage risk and providing long-term reliability.

Applications

Tesel Seal ambient temperature double piston PTFE seals are widely used in critical oil, gas, and LNG systems:

• API 6D Ball Valves – Ensure dual piston sealing at valve seats for leak-tight operation.
• Natural Gas Extraction & Wellheads – Protects against pressure variations in pipelines and production systems.
• Petroleum Transport Pipelines – Maintains reliable sealing under operational pressure fluctuations.
• LNG Systems – Supports cryogenic conditions and low-temperature sealing, maintaining integrity during thermal contraction.
• Process Control Valves – Provides precise regulation in fluid systems, improving operational efficiency and safety.
• Offshore & Onshore Facilities – Resistant to chemical exposure, H2S, CO2, and high-pressure dynamic loads.

Design Considerations

Key factors when selecting double piston PTFE seals:

• Pressure Conditions – Maximum operating pressure, pressure cycling, and overpressure scenarios.
• Temperature Range – Includes low-temperature and high-temperature environments.
• Sealing Performance – Desired redundancy, overpressure self-relief, and API 6D standard compliance.
• Media Compatibility – Hydrocarbons, natural gas, H2S, CO2, and chemical additives.
• Seal Configuration – Back-to-back double piston arrangement with PTFE/PEEK/metal support.
• Installation Constraints – Valve seat geometry, gland depth, and assembly space considerations.

Failure Analysis and Optimization

• Overpressure Deformation – Central backup ring prevents piston lip damage under reverse pressure >1.33× rated.
• Wear of PTFE Components – Repeated actuation and friction can reduce performance; spring energization mitigates wear.
• Thermal Fatigue – Temperature cycling may reduce elasticity; back-to-back piston configuration distributes stress.
• Chemical Degradation – Resistant to H2S, CO2, hydrocarbons; PEEK and PTFE provide chemical protection.
• Installation Misalignment – Proper assembly is critical; Tesel Seal provides installation guidance and precise tolerances.

Optimization involves material selection, dual-piston configuration, spring energization, support ring integration, and field validation under operational conditions.

Common Questions and Answers

• What is the advantage of a double piston design? – Provides dual sealing interfaces for redundancy, reducing leakage and improving safety.

 
• Is it suitable for H2S and CO2 environments? – Yes, PEEK and PTFE components provide chemical resistance.

 
• Can these seals handle high pressure? – Up to 2500 LB with backup rings; robust for dynamic operational conditions.

 
• Is customization available? – Tesel Seal offers tailored solutions for specific valve designs, media, and operating requirements.

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