Piston seal, single-acting Type KD 01
The single-acting piston seal type KD 01 is primarily used in cylinders with one-sided pressurization. It promises stick-slip free running as well as good dry-running properties. These piston seals are suitable for mineral oil-based hydraulic liquids, environment-friendly bio-oils and water to flame-resistant hydraulic liquids and air.
While the PTFE profile ring seals dynamically against the cylinder surface, the elastic O-ring ensures uniform contact pressure of the PTFE profile ring onto the cylinder surface, and at the same time, a static sealing between profile ring and groove base.
Even with low pressures, the piston seal shows good sealing effect due to the inherent preloading of the PTFE profile ring and the contact force of the preloaded O-ring. At higher system pressures, the medium pressurizes the O-ring causing it to press the PTFE seal with enhanced force against the cylinder surface.
Through the different material combinations, the piston seal can be used reliably across the whole pressure, speed and temperature range.
Application media
- Mineral oil-based hydraulic liquids
- Water
- Air
- Environment-friendly bio-oils
- Flame-resistant hydraulic liquids
- Other media, depending on the O-ring material
Application range
- Pressure: up to 40 Mpa (400 bar)
- Speed: approx. up to 15 m/s
- Temperature: – 30 °C to + +200 °C (depending on the O-ring material)
Surface finish
| Roughness depth | Ra | Rt |
| Running surface | ≤ 0,3 µm | ≤ 3,0 µm |
| Groove base | ≤ 1,6 µm | ≤ 16,0 µm |
| Groove flank | ≤ 1,6 µm | ≤ 16,0 µm |
Installation dimensions
| ø of bore hole DN H9 | Gap size S | O-ring | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Standard Application |
light Application |
Heavy application | ø Groove base d1 h9 | Groove width L1+0,2 |
Radius R r1 |
10 Mpa max. | 20 Mpa max. | 40 Mpa max. | line ø d2 |
| 8,0 – 16,9 | 17,0 – 26,9 | – | DN – 4,9 | 2,2 | 0,4 | 0,3 | 0,2 | 0,15 | 1,78 |
| 17,0 – 26,9 | 27,0 – 59,9 | – | DN – 7,3 | 3,2 | 0,6 | 0,4 | 0,25 | 0,15 | 2,62 |
| 27,0 – 59,9 | 60,0 – 199,9 | 17,0 – 26,9 | DN – 10,7 | 4,2 | 1,0 | 0,5 | 0,3 | 0,2 | 3,53 |
| 60,0 – 199,9 | 200,0 – 255,9 | 27,0 – 59,9 | DN – 15,1 | 6,3 | 1,3 | 0,7 | 0,4 | 0,25 | 5,33 |
| 200,0 – 255,9 | 256,0 – 669,9 | 60,0 – 199,9 | DN – 20,5 | 8,1 | 1,8 | 0,8 | 0,6 | 0,35 | |
| 256,0 – 669,9 | 670,0 – 999,9 | 200,0 – 255,9 | DN – 24,0 | 8,1 | 1,8 | 0,9 | 0,7 | 0,4 | 7,0 |
PTFE profile ring material
PTFE + bronze
The standard for hydraulic applications, good gliding behavior, particularly pressure and abrasion resistant, cannot be used in aqueous solutions or acids
PTFE + Glass-MoS2
Particularly good resistance to wear and abrasion, application is possible even with poor lubricating pressure fluids, in water and in water-oil emulsions
PTFE + carbon
Exceptional resistance to abrasion and extrusion, can be used in water-hydraulics
For other possible materials see our overview of PTFE materials in the technical information section.
O-ring material
- Nitrile rubber NBR: Temperature range − 30 °C to + 120 °C
- Fluororubber: FPM Temperature range − 25 °C to + 200 °C
Materials overview for dynamic seals (PDF)
The following overview is a selection of typical PTFE materials used for seals, guide elements and wipers. Other PTFE materials are available for special applications.
Product data sheet (PDF)
Our data sheet for the Piston seal, single-acting Type KD 01 can be found here.
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