GENERAL
The PTFE rod seal set CRR consists off a PTFE-face seal which takes care of the dynamic sealing on the inside diameter of the rod and a clamped O-Ring which provides a pretension on the face seal and transfers the static sealing on the outside diameter. With intensified pressure of the system, the O-Ring pretension increases, caused to the design and therewith the contact pressure of the face seal against the rod. To be sealed are piston-rods and plungers within hydraulic cylinders, if compared to sealing with elastomeric seals, a lower friction is wanted.
ADVANTAGES ARE
- low sliding friction and breakaway, low stick-slip effect for consistant motion, even with low sliding speed
- highly extrusion resistant
- low abrasion
- highly temperature resistant
- multiple applications, through appropriate selection of O-Ring compound
- flexible chemical compatibility through appropriate selection of O-Ring compound
- available up to 2000 mm diameter
PLEASE NOTE
With this sealing profile it’s very important to achieve an exact guidance of the metal components through guide-tapes or wear-rings.
| APPLICATION RANGE | |
| working pressure: | ≤ 35 MPa (350 bar) |
| operation temperature: | -30 to +100 °C* >FKM 200 °C< |
| sliding Speed: | ≤ 4 m/s |
MOUNTING INSTRUCTIONS
With a diameter of <10 mm open seal housings are necessary.
INSTALLATION
For diameters < 10 mm open grooves are required.
| MATERIAL | |
| sealing rings: | modified PTFE (PT012) |
| O-rings: | NBR-elastomer with approximately 70 Shore A |
In certain cases (high temperature, speed, specificresistance to pressure, or use of water, HFA-, HFB- fluids a.s.o.), we advise to take another sealing cross section, or please contact with our application technology.
ORDER EXAMPLE
Rod diameter = 50 mm
CRR 0500 PT012 70N1 D
| CRR = | Profile |
| 0500 = | Rod Ø x 10 |
| PTO12 = | Compound |
| 70N1 = | Serial number, Last digit: O-ring code |
| D = | Cross section |
* according to compound selection of the O-Ring
HOUSING DIMENSIONS
| Series No. | Cross-section | O-ring | Recommended rod Ø range | Groove width | Groove depth | Gap max. | Radius max. | |
| cross-section | d (mm) | |||||||
| (mm) | ≥ | < | L (mm) | G (mm) | e (mm) | R1 (mm) | ||
| Housing dimensions for O-Ring grooves without back-up ring | ||||||||
| 70N1 | A | 1,78 | 4 | 10 | 2,4 | 1,45 | 0,13 | 0,5 |
| 70N1 | B | 2,62 | 10 | 20 | 3,6 | 2,25 | 0,13 | 0,5 |
| 70N1 | C | 3,53 | 20 | 40 | 4,8 | 3,1 | 0,15 | 0,5 |
| 70N1 | D | 5,33 | 40 | 120 | 7,1 | 4,7 | 0,17 | 0,9 |
| 70N1 | E | 6,99 | 120 | 400 | 9,5 | 6,1 | 0,25 | 0,9 |
| Housing dimensions for O-Ring grooves with 1 back-up ring | ||||||||
| 71N1 | A | 1,78 | 4 | 10 | 3,8 | 1,45 | 0,13 | 0,5 |
| 71N1 | B | 2,62 | 10 | 20 | 5,0 | 2,25 | 0,13 | 0,5 |
| 71N1 | C | 3,53 | 20 | 40 | 6,2 | 3,1 | 0,15 | 0,5 |
| 71N1 | D | 5,33 | 40 | 120 | 8,8 | 4,7 | 0,17 | 0,9 |
| 71N1 | E | 6,99 | 120 | 400 | 10,5 | 6,1 | 0,25 | 0,9 |
| Housing dimensions for O-Ring grooves with 2 back-up rings | ||||||||
| 72N1 | A | 1,78 | 4 | 10 | 3,8 | 1,45 | 0,13 | 0,5 |
| 72N1 | B | 2,62 | 10 | 20 | 5,0 | 2,25 | 0,13 | 0,5 |
| 72N1 | C | 3,53 | 20 | 40 | 6,2 | 3,1 | 0,15 | 0,5 |
| 72N1 | D | 5,33 | 40 | 120 | 8,8 | 4,7 | 0,17 | 0,9 |
| 72N1 | E | 6,99 | 120 | 400 | 10,5 | 6,1 | 0,25 | 0,9 |
Special sizes are available quickly.
O-RING DESIGNATIONS IN PTFE-SEALS
| Material | Härte | OR-Code |
| NBR | 70+/-5 | N1 |
| FKM | 75+/-5 | V2 |
| NB 304 (HNBR) | 75+/-5 | N3 |
| EPDM | 75+/-5 | E4 |
| NB 578 | 75+/-5 | N5 |
| NBR | 90+/-5 | N6 |
| Silikon | 70+/-5 | S7 |
| HNBR | 80+/-5 | N8 |
| FFKM | 80+/-5 | V9 |
Download | Detailed product information (PDF 394.0 kB)
