Lens Ring Joint Gasket
Product Description
Product Detail
Lens Ring Joint Gasket – High-Pressure Metal Sealing Solution
The Lens Ring Joint Gasket (Style KXT 840), also known as a washer with ball face, is a precision-engineered metal gasket designed specifically for high-pressure pipe connections where conventional gaskets would fail. The lens ring gasket achieves its seal through a unique ball-to-cone contact mechanism – the spherical sealing surface of the gasket mates with the conical sealing face of the pipe flange, creating a reliable metal-to-metal seal that performs under extreme pressures and temperatures.
As an ISO 9001:2015 certified manufacturer with over 15 years of experience in metal gasket production, we engineer our lens ring gaskets to deliver consistent, leak-tight performance in critical applications across oil & gas, petrochemical, and offshore industries.
How the Lens Ring Gasket Seals – The Science of Line-to-Band Contact
✔ The Science of Line-to-Band Contact:
The sealing mechanism of a lens ring gasket is fundamentally different from flat gaskets. The gasket's spherical sealing face initially contacts the flange's conical sealing surface only along a circumferential line – a "line seal." When preload force is applied during bolting, the lens ring gasket undergoes controlled plastic deformation at the contact point, transforming that line into a sealing band (a "belt seal"). This progressive deformation creates an exceptionally tight, pressure-energized seal that actually becomes more reliable as internal pressure increases. The spherical-to-conical geometry also self-centers the gasket during assembly, simplifying installation and reducing misalignment risk.
Technical Specifications – Style KXT 840
| Parameter | Specification / Range |
|---|---|
| Gasket Factor (m) | 5.50 – 6.50 |
| Max. Operating Pressure | ≤ 32 MPa |
| Temperature Range | -196°C to +1000°C |
| Min. Pre-Tightening Pressure (y) | 126.6 – 182.8 MPa |
| Hardness Requirement | 15–20 HB lower than mating flange |
Key Features
- High-pressure capability: The lens ring gasket is designed for service pressures ≥10MPa, making it ideal for critical high-pressure pipe connections.
- Line-to-band sealing: The controlled plastic deformation of the lens ring joint gasket creates a reliable, pressure-energized seal.
- Self-centering geometry: The spherical sealing face naturally aligns with the conical flange face, simplifying installation.
- Extreme temperature range: Withstands -196°C to +1000°C, suitable for cryogenic and high-temperature processes.
- Pressure-energized performance: Like double-cone gaskets, the lens ring gasket achieves tighter sealing as internal pressure increases.
- Material flexibility: Available in over 15 alloys to match specific corrosion and temperature requirements.
Available Materials
Soft Iron, Low Carbon Steel, SS410, SS304, SS316, SS347, F5, F11, Copper, Aluminum, Inconel 600, Inconel 625, Incoloy 800, Incoloy 825, Monel 400, Titanium, Nickel 200, Hastelloy C276, Zirconium 702.
Hardness note: The lens ring gasket hardness must be 15–20 HB lower than the mating flange face hardness to prevent flange damage.
Key Applications
- Oil & Gas pipeline connections
- Petrochemical plant piping
- Offshore platform equipment
- High-pressure valve assemblies
- Vessel and pressure container joints
- High-temperature steam systems
Compliance Standards
- API 6A – Wellhead Equipment
- ASME B16.20 – Metallic Gaskets
- DIN 2693-67 – Lens Ring Gaskets
- JPI-7S-23-72 – Japanese Standard
- DIN-2696-1999 – Updated Specification
- Custom / Non-standard sizes available
Supply Chain Reliability
As a leading lens ring joint gasket manufacturer in China, we maintain substantial stock of standard sizes in common materials (Soft Iron, SS304, SS316) for immediate dispatch. We offer free sample evaluations for qualified companies to validate quality and dimensional accuracy before bulk ordering.
- Stock Availability: Standard sizes ship in 3–5 working days.
- OEM / Customization: We support custom dimensions, non-standard materials, and special hardness requirements.
- Wholesale Pricing: Direct factory supply ensures competitive rates without compromising material quality.
- Global Shipping: Professional export packaging with rust protection and secure crating.
Trust your critical high-pressure sealing applications to a partner with proven expertise. Contact our technical sales team today to discuss your specific pressure, temperature, and material requirements. We provide full engineering support and rapid quotation for both stock and custom-engineered lens ring gasket solutions.
Complete your piping system sealing: Explore our Ring Joint Gaskets, Octagonal Ring Joint Gaskets, and Oval Ring Joint Gaskets for complete sealing solutions.
Frequently Asked Questions About Lens Ring Joint Gaskets
Quick answers to the most common questions about our lens ring joint gaskets (Style KXT 840).