ODI Piston Seal | What ODI Piston Seal ? NOK SEAL HYDRAULIC | A2Z SEALS
Product Description
▪ A large cross-section design that can be used over a wide pressure range.
▪Made from Iron Rubber (NOK product name of polyurethane elastomer) U801, providing excellent abrasion resistance and sealing performance.
NOK OIL SEAL
Nok oil seal is a mechanical component used to seal oil. It isolates the parts of the transmission component that need to be lubricated from the output components so that lubrication and leakage are not allowed.
Special Packing for Piston seals
R=0.3 or below.
The inner surface of the cylinder tube should be finished by burnishing (RLB) or honing (GH) to 0.4 to 3.2 μmRz (0.1 to 0.8 μmRa).
Especially under serve lubricating condition, burnishing is required.
● The roughness is JIS B 0601:2001. When regulation length cannot be kept, apply Pt.
How to determine B dimension
■ When using backup ring. Please determine B dimension according to the table below.
| Maximum Service Pressure | 14MPa | 21MPa | 35MPa |
| Material of Backup ring | 19YF | ||
| B dimension | B≧φD-1.0 | B≧φD-0.5 | B≧φD-0.2 |
| Maximum Service Pressure | 35MPa | 42MPa | 70MPa |
| Material of Backup ring | 80NP | ||
| B dimension | B≧φD-0.8 | B≧φD-0.4 | B≧φD-0.2 |
■ When not using backup ring.
To determine B dimension, please refer to the graph in the right for the maximum extrusion gap (one side)
considering the eccentricity of operating condition of the piston.
Specification Table
ODI type Iron rubber (PUR)
Material : NOK U801