Heavy DanaStep Pressure Relieved Rod Seal R311
Heavy DanaStep Pressure Relieved is not only a heavy version of DanaStep. The seal is also designed with a unique ventilating function. In case of a pressure build-up between the two seals, it can open and relieve the pressure from behind.
This unique profile has a pressure relieve hole (2). The hole secures that in case of pressure build-up between seals, the pressure can be relieved. The support edge (5) designed with axial grooves. The support edge secures correct positioning of the primary sealing edge.
Advantages:
- Ventilating function
- High formstability against extrusion
- High dynamic and static sealing effect
- High extrusion resistance
- Low friction
- No stick-slip
- Small groove
- High operational stability
- Suitable for a wide variety of media
APPLICATION EXAMPLES
- Steel mills & Presses
Working conditions:
- Pressure: 80 Mpa
- Temperature: NBR ring: -30 to +100 FPM ring: -10 to +200
- Application: High pressure, Intensive movement
- Speed: 15 m/s
- Diameter range: 100 to *3000 mm
- Action: Single-acting
- Seals larger than 1000 mm please contact us for design details
Frequently used Material DanaFlon | |||||
|---|---|---|---|---|---|
Operating temperature range | –200 to +260 °C | –200 to +260 °C | –200 to +260 °C | –200 to +260 °C | –200 to +260 °C |
Basis material | PTFE | Modified PTFE | Modified PTFE | PTFE | Modified PTFE |
DanaFlon | 24 | 25* | 45 | 55 | 51* |
Filler | Bronze & Additives | Bronze & Additives | Carbon fibre | Glass & MoS2 | Glass & MoS2 |
Colour | Brownish | Brownish | Dark Gray | Light Gray | Light Gray |
Extreme form stability and extrusion resistance | Yes | Yes | Yes | (Yes) | Yes |
Lubricating media | Yes | Yes | Yes | Yes | Yes |
Extreme wear resistance | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
Wide range of media | No | No | Yes | Yes | Yes |
Non-lubricating media | No | No | Yes | Yes | Yes |
Food applications | No | No | No | No | No |
Conforms to food regulation | No | No | No | No | No |
*DF25 is similar to the well known DF24 and *DF51 is similar to the well known DF55, but they has even higher formstability against extrusion.
The Rubber-Profile-Rings may limit the temperature range and need to be compatible with the media.
The performance of the seal will always depend on the total picture of working conditions.
Verifying the performance of the seal can only be done by test at the actual working conditions.
Heavy DanaStep Pressure Relieved Rod Seal R311
Technical details
Here you can see the technical details
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Ra max (0.2 μm)
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Rz max (1.25 μm)
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Rp max (0.63 μm)
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Tp = 50 - 70% at depth of p= 0.25 Rz
Heading #3 | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Serie | Rod | øA H8 | G + 0,2– 0 | R | C | Max radial Clearance | ||||
øB f8 | 16 MPa | 26 MPa | 32 MPa | 40 MPa | ||||||
R31 | 12 | 100 – 220 | øB + 20 | 10,0 | 0,4 | 7,5 | 0,75 | 0,50 | 0,40 | 0,40 |
13 | 220 – 300 | øB + 25 | 12,5 | 0,4 | 10 | 0,75 | 0,65 | 0,55 | 0,50 | |
14 | 300 – 540 | øB + 30 | 15,0 | 0,8 | 12 | 0,75 | 0,65 | 0,55 | 0,50 | |
15 | 530 – 690 | øB + 35 | 17,5 | 1,2 | 12 | 0,75 | 0,65 | 0,55 | 0,50 | |
16 | 690 – 2000 | øB + 40 | 20,0 | 1,2 | 15 | 0,80 | 0,70 | 0,60 | 0,55 | |
Max radial clearance is based in DanaFlon 24 and 100°C. For other hi-filled DanaFlon compounds please ask Dana-Seals A/S.
Clearance: At pressure >40Mpa use diameter tolerance H7/f7 (Bore/Rod.)
7 NBR
8 FPM
Delivery times
For special requests, please complete our Request form or call us on +45 4922 4400.
