Graphite Laminated Triple Offset Valve Seals
High-Performance Graphite TOSV SealS
The Graphite Laminated TOSV Seal is our headline product, engineered for high-performance sealing in extreme industrial environments.
A sophisticated five-ply laminate structure provides a 100% seal in all directions, making them the preferred choice for procurement engineers and technical specifiers operating in sectors with temperature extremes and aggressive media.
Five-Ply Laminate Construction and Materials
The integrity of our graphite seals stems from their robust construction. Each seal is manufactured as a five-ply laminate (Alloy / Graphite / Alloy / Graphite / Alloy).
This sandwich construction ensures mechanical strength while maintaining the flexibility required for torque-seated sealing.
We offer two primary material configurations to suit varied chemical and environmental demands:
- 1mm Inconel® alloy 625
- 1.2mm Monel® alloy 400
These metal layers are paired with 1mm SGL Carbon Grade Z Graphite, which boasts a 99.85% purity level, ensuring minimal impurities and maximum sealing performance.
Inconel® and Monel® are registered trademarks of Special Metals Corporation.
Technical Specifications and Temperature Ratings
Richard Miles graphite seals are designed to perform where standard sealing materials fail.
Our seals are rated for service from cryogenic temperatures up to +450°C (+842°F). This wide operational envelope makes them suitable for everything from LNG applications to high-pressure steam systems.
Standard sizing ranges from 2 inches (50mm) to 24 inches (600mm). However, as a specialist manufacturer, we regularly consider special sizes and bespoke dimensions upon request to meet unique project requirements.
Every seal is supplied with full batch traceability, which is laser etched onto the outermost metal layer for permanent identification.
Precision Machining and Triple Offset Geometry
Our graphite seals leverage triple offset geometry to eliminate the friction and wear typically found in concentric or double offset valves.
By rotating the centreline of the cone away from the valve centreline, we achieve an ellipsoidal profile that allows the seal to engage the seat only at the final point of closure.
All graphite TOSV seals are supplied fully machined to customer-provided drawings. Our facility is capable of producing both round and elliptical outside circumferences with extreme precision.
Every component is validated via a Coordinate Measuring Machine (CMM) before dispatch, ensuring that the finished seal matches your engineering specifications exactly.
Why Specify Richard Miles Graphite Laminated Triple Offset Valve Seals?
Procurement engineers and maintenance managers choose Richard Miles Ltd because of our focus on intelligent engineering and quality assurance.
As a member of the British Valve & Actuator Association (BVAA), we adhere to the highest standards of manufacturing. Our seals are not generic components: they are precision instruments designed to extend the life of your valves and reduce the risk of costly system downtime.
The combination of high-purity SGL Carbon Grade Z Graphite and premium alloys ensures that our seals maintain their structural integrity even under repeated thermal cycling. This reliability is critical for systems handling hazardous or flammable materials where leakage is not an option.
Get in touch
Request a Technical Specification or Quote
If you require a quotation or detailed technical support for your next project, our engineering team is ready to assist. We provide specialist support to help you select the correct material configuration for your specific application.