BECA 86B
Description
The BECA 86B profile is a machined sealing ring made of virgin or filled PTFE. It features a primary lip for dynamic sealing against the main fluid, a dirt-exclusion lip, and an O-ring for static sealing. The primary sealing lip can be delivered pre-formed on a mandrel depending on the installation direction.
As the sealing lip is not spring-loaded, the profile can operate at higher speeds.
Advantages
Low coefficient of friction, no stick-slip effect when starting
Excellent abrasion resistance
Excellent resistance to pollution
Effective in dry or poorly lubricated environments
Excellent chemical inertness
Technical data
| Temperature | -15°C/+120°C |
|---|---|
| Pressure | Dynamic: 0.50 MPa |
| Speed | 25 m/s |
| PV maximum | PV (m/s x MPa) 2.6 in lubricated medium |
Applications
Aeronautics
Food processing valves
General industry
Medical
Electric motors
Pneumatic cylinders
Robotic
Materials
Joint profilé
Virgin PTFE
Carbon filled PTFE
Graphite filled PTFE
PTFE filled with glass fibers + MOS2
Joint torique
NBR 70 Shore A
FKM 70 Shore A
EPDM 70 Shore A
HNBR 70 Shore A
VMQ 70 Shore A
Download
for use
Dimensions
Materials
| Friction ring | O-ring | Contact surface | ||||||
|---|---|---|---|---|---|---|---|---|
| Standard code | ISO code | Material | Color | Features | Code | Nature of the material | Temperature of service* |
|
| DP | P | Virgin PTFE | White | Chemical resistance Impermeability Dielectric Anti-stick Low friction coefficient Food industry |
K6 | NBR 70 Shore A | -15°C / +100°C | Steel Stainless steel Chrome steel Aluminum Bronze Cast iron Treated surface |
| G6 | FKM 70 Shore A | -15°C / +120°C | ||||||
| C6 | EPDM 70 Shore A | -15°C / +120°C | ||||||
| F6 | VMQ 70 Shore A |
-15°C / +120°C | ||||||
| DC | C | PTFE + 25% Carbon |
Grey |
Improvement
Good resistance to chemicals Powerful in applications dynamic with compression |
K6 | NBR 70 Shore A | -15°C / +100°C | |
| G6 | FKM 70 Shore A | -15°C / +120°C | ||||||
| C6 | EPDM 70 Shore A | -15°C / +120°C | ||||||
| CG | C | PTFE + 23% Carbon + 2%Graphite |
Black | K6 | NBR 70 Shore A | -15°C / +100°C | ||
| G6 | FKM 70 Shore A | -15°C / +120°C | ||||||
| C6 | EPDM 70 Shore A | -15°C / +120°C | ||||||
| DV | V | PTFE + 25 % Glass |
Blue |
Improvement
Slightly more abrasive, but this effect is corrected by the addition of MoS₂. Well suited to motion applications simultaneous rotating and reciprocating |
K6 | NBR 70 Shore A | -15°C / +100°C | Steel Chrome steel Cast iron |
| G6 | FKM 70 Shore A | -15°C / +120°C | ||||||
| VM | M | PTFE + 15 % Glass + 5% MoS2 |
Grey | K6 | NBR 70 Shore A | -15°C / +100°C | ||
| G6 | FKM 70 Shore A | -15°C / +120°C | ||||||
| DG | G | PTFE + 15% Graphite |
Black |
Improvement
Reduced wear of metal parts Self-lubrication Powerful in applications |
K6 | NBR 70 Shore A | -15°C / +100°C | Steel Stainless steel Chrome steel Aluminum Bronze Cast iron Treated surface |
| G6 | FKM 70 Shore A | -15°C / +120°C | ||||||
| C6 | EPDM 70 Shore A | -15°C / +120°C | ||||||
| DB | B | PTFE + 60% Bronze |
Dark brown |
Improvement
Self-lubrication Use for dynamic seals with high compression and low wear levels |
K6 | NBR 70 Shore A | -15°C / +100°C | Steel Chrome steel Cast iron |
| G6 | FKM 70 Shore A | -15°C / +120°C | ||||||
| B4 | B | PTFE + 40% Bronze |
Dark brown | K6 | NBR 70 Shore A | -15°C / +100°C | ||
| G6 | FKM 70 Shore A | -15°C / +120°C | ||||||
* Limited in temperature due to potential sealing loss caused by the thermal expansion of materials on seal profiles without metallic support.
Other material grades are available depending on your specific requirements.
Conditions for use
Shaft design
Shaft material
Suitable materials are:
- Common steels in mechanical construction type C35 and C45
- Stainless steels type 1.4300 and 1.4112 for watertightness
- Aluminum
- Cast iron
- Plastic materials
- Shaft hardness
The hardness of the shaft will depend on the linear speed (in m/s) and the level of the environment.
| HRC hardness | Rotation speed | |||||
|---|---|---|---|---|---|---|
| Environement | v ≤ 2,5 m/s | v ≤ 5,0 m/s | v ≤ 10,0 m/s | v ≤ 15,0 m/s | v ≤ 20,0 m/s | v ≤ 25,0 m/s |
| Lubricated | 35 | 40 | 52 | 58 | 58 | 62 |
| Dry | 40 | 52 | 58 | 60 | 62 | 62 |
| Water | 40 | 40 | 40 | 40 | 40 | 40 |
| Abrasive | 58 | 62 | 62 | 62 | 62 | 62 |
Surface conditions
The surface quality of the tree must take into account the recommendations below.
Standard conditions:
- Ra = 0.2 to 0.4 µm and 0.1 µm for rigorous applications
- Rz = 1.0 to 3.0 µm
Shaft tolerance
The shaft must be of tolerance h11 according to ISO 286-2
| Shaft diameter Ød1 (mm) |
Tolerance h11 (mm) |
|---|---|
| Ød1 ≤ 3,0 | -0,060 / 0 |
| 3,0 < Ød1 ≤ 6,0 | -0,075 / 0 |
| 6,0 < Ød1 ≤ 10,0 | -0,090 / 0 |
| 10,0 < Ød1 ≤ 18,0 | -0,110 / 0 |
| 18,0 < Ød1 ≤ 30,0 | -0,130 / 0 |
| 30,0 < Ød1 ≤ 50,0 | -0,160 / 0 |
| 50,0 < Ød1 ≤ 80,0 | -0,190 / 0 |
| 80,0 < Ød1 ≤ 120,0 | -0,220 / 0 |
| 120,0 < Ød1 ≤ 180,0 | -0,250 / 0 |
| 180,0 < Ød1 ≤ 250,0 | -0,290 / 0 |
| 250,0 < Ød1 ≤ 315,0 | -0,320 / 0 |
| 315,0 < Ød1 ≤ 400,0 | -0,360 / 0 |
| 400,0 < Ød1 ≤ 500,0 | -0,400 / 0 |
Chamfer and Radius
To avoid altering the primary lip of the sealing ring during assembly, it is strongly recommended to provide a chamfer on the shaft. Please refer to the table below.
| Shaft diameter Ød1 (mm) |
Chamfer diameter Ød3 (mm) |
Radius R (mm) |
|---|---|---|
| Ød1 ≤ 10,0 | Ød1 - 1,50 | 2,00 |
| 10,0 < Ød1 ≤ 20,0 | Ød1 - 2,00 | 2,00 |
| 20,0 < Ød1 ≤ 30,0 | Ød1 - 2,50 | 3,00 |
| 30,0 < Ød1 ≤ 40,0 | Ød1 - 3,00 | 3,00 |
| 40,0 < Ød1 ≤ 50,0 | Ød1 - 3,50 | 4,00 |
| 50,0 < Ød1 ≤ 70,0 | Ød1 - 4,00 | 4,00 |
| 70,0 < Ød1 ≤ 95,0 | Ød1 - 4,50 | 5,00 |
| 95,0 < Ød1 ≤ 130,0 | Ød1 - 5,50 | 6,00 |
| 130,0 < Ød1 ≤ 240,0 | Ød1 - 7,00 | 8,00 |
| 240,0 < Ød1 ≤ 500,0 | Ød1 - 11,00 | 12,00 |
Shaft Runout
Shaft runout refers to a deviation between the actual shaft axis and its theoretical axis of rotation. It is important to minimize shaft runout by positioning the sealing ring as close as possible to the bearing. The table below outlines the maximum permissible values depending on the rotational speed and the sealing lip material.
Eccentricity
The shaft and housing must be mounted centered in relation to each other to eliminate any one-sided radial loading at the sealing lip of the ring.
Housing design
Surface conditions
The surface quality of the tree must take into account the recommendations below.
Standard conditions for elastomer coated bushings:
Ra = 0.8 µm
Rz = 1.6 µm
Shaft tolerance
The shaft must be of tolerance h11 according to ISO 286-2
|
Bore diameter ØD1 (mm) |
Tolerance |
|---|---|
| 3,0 < ØD1 ≤ 6,0 | 0 / +0,018 |
| 6,0 < ØD1 ≤ 10,0 | 0 / +0,022 |
| 10,0 < ØD1 ≤ 18,0 | 0 / +0,027 |
| 18,0 < ØD1 ≤ 30,0 | 0 / +0,033 |
| 30,0 < ØD1 ≤ 50,0 | 0 / +0,039 |
| 50,0 < ØD1 ≤ 80,0 | 0 / +0,046 |
| 80,0 < ØD1 ≤ 120,0 | 0 / +0,054 |
| 120,0 < ØD1 ≤ 180,0 | 0 / +0,063 |
| 180,0 < ØD1 ≤ 250,0 | 0 / +0,072 |
| 250,0 < ØD1 ≤ 315,0 | 0 / +0,081 |
| 315,0 < ØD1 ≤ 400,0 | 0 / +0,089 |
| 400,0 < ØD1 ≤ 500,0 | 0 / +0,097 |
| 500,0 < ØD1 ≤ 630,0 | 0 / +0,110 |
Housing width
The table below provides information on the recommended groove width and radius.
| Height H1 |
Width | Radius R2 max |
|
|---|---|---|---|
| L2min (H1x0,85) | L1min (H1+0,3) | ||
| 7,00 | 5,95 | 7,30 | 0,30 |
| 8,00 | 6,80 | 8,30 | |
| 10,00 | 8,50 | 10,30 | |
| 12,00 | 10,30 | 12,30 | 0,40 |
| 15,00 | 12,75 | 15,30 | |
| 20,00 | 17,00 | 20,30 | |
Assembly recommendations
Several essential rules must be respected before proceeding with the assembly of the joints.
- Check that the mechanical parts (shaft and housing) have an entry chamfer.
- Deburr and chamfer or round off sharp edges, cover threaded parts.
- Remove machining chips and any impurities and other foreign particles
- Thoroughly clean all mechanical parts.
- If using assembly tools, check that they are clean and free of sharp edges.
Only on request