BECA 338
Description
The BECA 338 profile is a single acting symmetrical seal composed of a profiled, filled PTFE seal and two V-Shaped springs that are resistant to corrosion. Each of the springs acts individually on one of the seal's lips. This profile is particularly suited to applications where it is necessary to have a significant seal radial cross-section.
Advantages
Wide temperature range and excellent chemical resistance
Low friction coefficient; no stick-slip effect
Excellent abrasion resistance
Good dimensional stability
Non-toxic material
Technical data
| Temperature | -200°C/+260°C |
|---|---|
| Pressure | 30 MPa |
| Speed | 15 m/s |
| Medias | Practically all types of fluids, and chemical and gas products |
Applications
Food & Beverage
Measuring devices
Pumps
Separators
Valves
Materials
Profiled seal
Carbon-filled PTFE
V-Shaped spring
Stainless steel
Dimensions
Installation dimensions
Installation dimensions
| Cylinder sealing | Rod sealing | Groove width | Groove width | Radial section | ||
|---|---|---|---|---|---|---|
| Bore diameter ØD1 H9 |
Groove diameter Ød1 h9 |
Rod diameter Ød1 h9 |
Groove diameter ØD1 H9 |
L1 0/+0.20 | L according to ISO | S |
| 25.0 - ** | D1 - 25.00 | 25.0 - ** | d1 + 25.00 | 9.00 | 16.00/20.00/40.00 | 12.50 |
| 25.0 - ** | D1 - 30.00 | 25.0 - ** | d1 + 30.00 | 9.00 | 20.00/25.00/50.00 | 15.00 |
For special applications > 30 MPa, we recommend using H8/f8 (bore/piston) and H8/f8 (groove/rod) tolerances or selecting other more suitable materials. Please contact our experts.
Materials
| Profiled seal | V-Shaped springs | Contact surface area | ||||||
|---|---|---|---|---|---|---|---|---|
| Standard code | ISO code | Material | Colour | Characteristics | Code | Type of material | Service temperature | |
| DP | P | Virgin PTFE | White | Resistance to chemical products Sealing water Dielectric Non-stick Low friction coefficient Food & Beverage |
I | X10 Cr Ni 18-8 | -200°C/+260°C | Steel Stainless steel Chrome steel Aluminium Bronze Cast iron Treated surface |
| DC | C | PTFE +25% Carbon |
Grey |
Improvement
Good resistance to chemical products Efficient as part of dynamic |
||||
| CG | C | PTFE + 23% Carbon + 2% Graphite |
Black | |||||
| DV | V | PTFE + 25 % Glass |
Blue | Improvement
corrected with the addition of MOS2 Chemical and dielectric properties preserved Well suited to applications with rotating and simultaneous alternating movements |
Steel Chrome steel Cast iron |
|||
| VM | M | PTFE + 15 % Glass + 5% MoS2 |
Grey | |||||
| DX | X | GL Blue PTFE + Glass + Metal oxides |
Turquoise blue | Compression resistant Wear resistant Excellent chemical stability Good thermal conductivity |
||||
| DG | G | PTFE + 15% Graphite |
Black | Improvement
Self-lubricating Thermal and electrical conductivity Low permeability Good friction coefficient Anti-static Efficient as part of dynamic dynamic applications with self-lubrication |
Steel Stainless steel Chrome steel Aluminium Bronze Cast iron Treated surface |
|||
| K1 | K | PTFE + 10% Ekonol |
Light brown | Improvement
Good friction coefficient and low permeability |
||||
| K2 | K | PTFE 20% Ekonol |
Light brown | |||||
| DB | B | PTFE + 60% Bronze |
Dark brown | Improvement
Electrical and thermal conductivity Does not alter metal parts Reduced resistance to certain chemical products Used for dynamic seals with a strong compression and low level of wear |
Steel Chrome steel Cast iron |
|||
| B4 | B | PTFE + 40% Bronze |
Dark brown | |||||
| HG | HG | PE-UHMW | White or off-white | Excellent wear resistance on contact with water and air | I | X10 Cr Ni 18-8 | -70°C/+80°C | Steel Stainless steel Chrome steel Aluminium Bronze Cast iron Treated surface |
Other grades of materials are available depending on your specificities.
Technical data
Extrusion gaps
| Radial section S |
Radial extrusion gap F/2 |
|||
|---|---|---|---|---|
| 2 MPa | 10 MPa | 20 MPa | 30 MPa | |
| 7.00 | 0.10 | 0.08 | 0.05 | 0.05 |
| 8.00 | 0.10 | 0.08 | 0.05 | 0.05 |
| 10.00 | 0.15 | 0.10 | 0.08 | 0.05 |
| 12.50 | 0.15 | 0.10 | 0.08 | 0.05 |
| 15.00 | 0.15 | 0.10 | 0.08 | 0.05 |
Surface roughness
| Roughness | Dynamic surface area | Static surface area | Groove flanks |
|---|---|---|---|
| Ra | 0.05 - 0.2 µm | ≤ 1.6 µm | ≤ 3.2 µm |
| Rz | 0.4 - 1.6 µm | ≤ 6.3 µm | ≤ 10.0 µm |
| Rmax | 0.63 - 2.5 µm | ≤ 10.0 µm | ≤ 16.0 µm |
Chamfers and radius
| Radial section S |
Radius R1 |
Chamfer C |
|---|---|---|
| 7.00 | 0.80 | 4.50 |
| 8.00 | 0.80 | 4.50 |
| 10.00 | 0.80 | 6.50 |
| 12.50 | 0.80 | 6.50 |
| 15.00 | 1.00 | 8.00 |
|
338.245422
|
24,50 | 42,20 | 8,70 | 9,50 |
|
338.028042
|
28,00 | 42,00 | 9,70 | 10,00 |
|
338.032052
|
32,00 | 52,00 | 12,20 | 12,50 |
|
338.036052
|
36,00 | 52,00 | 10,20 | 10,50 |
|
338.040056
|
40,00 | 56,00 | 10,20 | 10,50 |
|
338.040060
|
40,00 | 60,00 | 12,20 | 12,50 |
|
338.050070
|
50,00 | 70,00 | 12,20 | 12,50 |
|
338.060080
|
60,00 | 80,00 | 12,20 | 12,50 |
|
338.060085
|
60,00 | 85,00 | 12,00 | 13,50 |
|
338.070090
|
70,00 | 90,00 | 12,20 | 12,50 |
|
338.080096
|
80,00 | 96,00 | 10,20 | 10,50 |
|
338.100116
|
100,00 | 116,00 | 10,20 | 10,50 |
|
338.155180
|
155,00 | 180,00 | 13,70 | 14,50 |
|
338.155185
|
155,00 | 185,00 | 16,70 | 17,00 |
|
338.165190
|
165,00 | 190,00 | 16,70 | 17,00 |
|
338.290320
|
290,00 | 320,00 | 16,70 | 17,00 |
|
338.300235
|
300,00 | 325,00 | 8,70 | 9,00 |