Double Acting Cap
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Product Overview A self-actuating, bi-directional, extrusion resistant seal that combines low breakout and running friction with minimal leakage. The seal is constructed of a premium grade PTFE sealing element and an elastomer energiser. The Double Acting Cap Seal is a reliable, compact design with a long service life and is available in both rod and piston type geometries to retro-fit into ISO7425-2. Stick-slip is eliminated even after long periods of inactivity whether in a lubricated or non-lubricated environment, giving low breakout friction. |
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Standard Radial Sections
| Radial Section Code | Standard Bore/Rod Diameter (mm) | Piston Groove Diameter (mm) | Rod Groove Diameter (mm) | Groove Width (mm) |
|---|---|---|---|---|
| A = 1.78 | 8 - 16.9 | Bore Ø -4.9 | Rod Ø +4.9 | 2.20 |
| B = 2.62 | 17 - 26.9 | Bore Ø -7.3 | Rod Ø +7.3 | 3.20 |
| C = 3.53 | 27 - 59.9 | Bore Ø -10.7 | Rod Ø +10.7 | 4.20 |
| D = 5.33 | 60 - 199.9 | Bore Ø -15.1 | Rod Ø +15.1 | 6.30 |
| E = 6.99 | 200 - 255.9 | Bore Ø -20.5 | Rod Ø +20.5 | 8.10 |
Elastomeric Energiser Materials
| Elastomer | Colour | Hardness (IRHD) | Temperature Range | Select for.. | Compound Reference |
|---|---|---|---|---|---|
| Silicone (VMQ) | Red | 70 | -60 to +220oC |
High and very low temperature; high eccentricity |
714177 |
| Polyacrylate (ACM) | Black | 70 | -10 to +150oC |
High temperature capabilities; good compatibility with engine oils |
335001 |
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Nitrile Rubber (NBR) |
Black | 70 | -30 to +120oC | General purpose | 36624 |
| Fluorocarbon (FKM, A-Type) | Black | 75 | -20 to +200oC |
High temperature performance; high speed applications; 514141 (Viton® GF type) for improved coolant and fuel resistance |
51414 |
| Green | 75 | -20 to +200oC | 51414G | ||
| Fluorocarbon (FKM, GF-Type) | Black | 75 | -10 to +200oC | 514141 | |
| Hydrogenated Nitrile (HNBR) | Black | 70 | -30 to +180oC | High temperatures, moderate fuel resistance | 88625 |
PTFE Grade Codes
| Material Composition | Colour | Coefficient of Friction | Temperature Range | Select for.. | PTFE Reference |
|---|---|---|---|---|---|
| Virgin PTFE | White | 0.05/0.08 |
-240 to +200oC |
Static or low duty cycles | E400 |
| Glass and MoS2 reinforced PTFE | Grey/Black | 0.06/0.10 | -160 to +290oC |
Dynamic or static, medium duty cycles, hardened metal running surfaces |
E431 |
| Graphite reinforced PTFE | Black | 0.06/0.10 | -200 to +250oC |
Dynamic, medium duty cycles |
E471 |
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Carbon and graphite reinforced PTFE |
Black | 0.08/0.12 | -200 to +250oC | Dynamic, medium duty cycles | E462 |
| Polyester reinforced PTFE | Beige | 0.08/0.12 | -130 to +290oC |
Dynamic or static, medium to high duty cycles, minimum 45 HRc running surface |
E491 |
| Carbon, graphite and PPS reinforced PTFE | Grey/Black | 0.08/0.12 | -130 to +290oC |
Dynamic or static, high duty cycles, hardened metal running surfaces |
E282Z |