Pure Graphite Flange Gaskets with Inner Ring
An inner-ring pure graphite flange gasket is a graphite gasket reinforced with a stainless steel ring fitted to its inner edge. The ring stops graphite creeping inward under pressure and mixing with the medium, and makes the gasket mechanically stronger.
It is used on high-pressure steam, high-temperature water and process lines where higher strength is needed alongside pure graphite sealing. Ring material and gasket thickness are selected by model.
Main Applications
- High-pressure steam lines
- High-temperature water and boiler flanges
- Process and chemical lines
- Heat exchanger connections
- Critical flanges rarely opened
Technical Data
| Material | Expanded graphite + inner ring |
|---|---|
| Inner ring | Stainless steel (AISI 316, by model) |
| Thickness | By model |
| Dimension standard | EN 1514-1 |
| Compatible flanges | EN 1092-1 (DIN) and ASME B16.5 |
| Temperature and pressure | By grade, per manufacturer datasheet |
| Medium | Steam, high-temperature water, process media |
Material Options
| Part | Inner-ring pure graphite |
|---|---|
| Sealing layer | Expanded graphite |
| Inner ring | Stainless steel (by model) |
| Reinforcement | By model |
| Thickness | By model |
Which material? The inner ring must match the flange bore; if the ring diameter is larger than the pipe bore it does not protrude into the flow, if smaller it can cause turbulence and wear. Size is confirmed by flange standard at order.
Advantages
No Graphite Creep
- Inner ring protection
Stronger
- Mechanical support
High Pressure
- Steam and hot water
Clean Line
- Graphite stays out of the medium
Construction and Design Features
- Pure graphite sealing ring
- Stainless ring on the inner edge
- Outer diameter to flange size
- Flat gasket form
Write the flange size, pressure class and temperature; we will confirm the inner-ring gasket with a suitable ring material.
How to Choose?
- Set the pressureChoose the inner-ring type on high-pressure lines.
- Select the ring materialPick a stainless grade suited to the medium.
- Confirm the sizeCheck the inner ring fits the flange bore.
- Set the thicknessChoose thickness by flange face.
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