Click image to enlarge
| Item | Description |
|---|---|
| 1.1 | Seal face |
| 2.1 | Stationary seat |
| 1.2 | O-Ring |
| 1.3 | Spring |
| 2.2 | O-Ring |
BT-RN.NB has an installation length l1N in accordance with EN 12756 (normal length).
BT-RN.KB has an installation length l1K in accordance with EN 12756 (short length).
BT-RN.NB / BT-RN.KB
Features
- Single seal
- For stepped shafts
- Balanced version of BT-RN
- Conical spring rotating
- Dependent on direction of rotation
- Torque transmission via conical spring
Advantages
- Economical balanced seal
- Universal application opportunities
- No damage of the shaft by set screws
- Variants with shrink fitted face available
Operating range
Shaft diameter:
d1 = 10 … 100 mm (0.39" … 3.94")
Pressure: p1* = 25 bar (363 PSI)
Temperature:
t* = -20 °C … +180 °C (-4 °F … +356 °F)
Sliding velocity: vg = 15 m/s (49 ft/s)
* Dependent on medium, size and material
Materials
Seal face:
rNi steel 1.4057 (F1), CrNiMo steel 1.4401 (G), Tungsten carbide (U), Silicon carbide (Q1)
Seat:
Carbon graphite antimony impregnated (A), Carbon graphite resin impregnated (B), Tungsten carbide (U), Silicon carbide (Q1) Elastomers:
NBR (P), EPDM (E), FKM (V), FFKM (V)
Metal parts:
CrNiMo steel (G), CrNi steel (F, F1)
Standards and approvals
- Various material approvals e.g. WRAS, UBA, ACS, NSF, FDA available (depending on type and material combinations). Please inquire!
- EN 12756
Recommended applications
- Water and wastewater technology
- Building services industry
- Low solid content media
- Centrifugal pumps
- Clean water pumps
Notes
Alternative seat ring can be supplied with short tail or long tail with slot for pin (to prevent seat rotation).
Product variants
BT-RN3.NB / KB
Seal faces made of brazed tungsten carbide which is suitable for media with medium corrosive and abrasive characteristics.
Item Description
1 Seal face housing
1a Brazed seal face
2 Stationary seat housing
2a Brazed stationary seat
3, 3a O-Ring
4 Spring
A Spacer (upon request)
Click image to enlarge
PF L1
Item Description
2.1 Stationary seat
2.2 O-Ring
Click image to enlarge
PF L
Item Description
2.1 Stationary seat
2.2 O-Ring
Click image to enlarge
BT-RN.NB |
d2 |
d3 |
d4 |
d6 |
d7 |
d8 |
l1NB |
H |
l1 |
l2 |
l3 |
l4 |
l5 |
l6 |
l7 |
BT.RN.KB |
l3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 10 | 14 | 24 | 26 | 17 | 21 | 3 | 50 | - | 50 | 18 | 43 | 7 | 1.5 | 4 | 8.0 | 40.0 | 33.0 |
| 12 | 16 | 26 | 28 | 19 | 23 | 3 | 50 | - | 50 | 18 | 43 | 7 | 1.5 | 4 | 8.5 | 40.0 | 33.0 |
| 14 | 18 | 32 | 34 | 21 | 25 | 3 | 55 | 9 | 46 | 18 | 39 | 7 | 1.5 | 4 | 8.5 | 42.5 | 35.5 |
| 16 | 20 | 34 | 36 | 23 | 27 | 3 | 55 | 8 | 47 | 18 | 40 | 7 | 1.5 | 4 | 8.5 | 42.5 | 35.5 |
| 18 | 22 | 36 | 38 | 27 | 33 | 3 | 55 | 4 | 51 | 20 | 41 | 10 | 2.0 | 5 | 9.0 | 45.0 | 35.0 |
| 20 | 24 | 38 | 40 | 29 | 35 | 3 | 60 | 7 | 53 | 20 | 43 | 10 | 2.0 | 5 | 9.0 | 45.0 | 35.0 |
| 22 | 26 | 40 | 42 | 31 | 37 | 3 | 60 | 7 | 53 | 20 | 43 | 10 | 2.0 | 5 | 9.0 | 45.0 | 35.0 |
| 24 | 28 | 42 | 44 | 33 | 39 | 3 | 60 | - | 60 | 20 | 50 | 10 | 2.0 | 5 | 9.0 | 47.5 | 37.5 |
| 25 | 30 | 44 | 46 | 34 | 40 | 3 | 60 | - | 60 | 20 | 50 | 10 | 2.0 | 5 | 9.0 | 47.5 | 37.5 |
| 28 | 33 | 47 | 49 | 37 | 43 | 3 | 65 | - | 65 | 20 | 55 | 10 | 2.0 | 5 | 9.0 | 50.0 | 40.0 |
| 30 | 35 | 49 | 51 | 39 | 45 | 3 | 65 | - | 65 | 20 | 55 | 10 | 2.0 | 5 | 9.0 | 50.0 | 40.0 |
| 32 | 38 | 54 | 58 | 42 | 48 | 3 | 65 | - | 65 | 20 | 55 | 10 | 2.0 | 5 | 9.0 | 50.0 | 40.0 |
| 33 | 38 | 54 | 58 | 42 | 48 | 3 | 65 | - | 65 | 20 | 55 | 10 | 2.0 | 5 | 9.0 | 50.0 | 40.0 |
| 35 | 40 | 56 | 60 | 44 | 50 | 3 | 65 | - | 65 | 20 | 55 | 10 | 2.0 | 5 | 9.0 | 50.0 | 40.0 |
| 38 | 43 | 59 | 63 | 49 | 56 | 4 | 75 | - | 75 | 23 | 62 | 13 | 2.0 | 6 | 9.0 | 52.5 | 39.5 |
| 40 | 45 | 61 | 65 | 51 | 58 | 4 | 75 | - | 75 | 23 | 62 | 13 | 2.0 | 6 | 9.0 | 52.5 | 39.5 |
| 43 | 48 | 64 | 68 | 54 | 61 | 4 | 75 | - | 75 | 23 | 62 | 13 | 2.0 | 6 | 9.0 | 52.5 | 39.5 |
| 45 | 50 | 66 | 70 | 56 | 63 | 4 | 75 | - | 75 | 23 | 62 | 13 | 2.0 | 6 | 9.0 | 52.5 | 39.5 |
| 48 | 53 | 69 | 73 | 59 | 66 | 4 | 85 | - | 85 | 23 | 72 | 13 | 2.0 | 6 | 9.0 | 52.5 | 39.5 |
| 50 | 55 | 71 | 75 | 62 | 70 | 4 | 85 | - | 85 | 25 | 71 | 14 | 2.5 | 6 | 9.0 | 57.5 | 43.5 |
| 53 | 58 | 78 | 83 | 65 | 73 | 4 | 85 | - | 85 | 25 | 71 | 14 | 2.5 | 6 | 9.0 | 57.5 | 43.5 |
| 55 | 60 | 80 | 85 | 67 | 75 | 4 | 85 | - | 85 | 25 | 71 | 14 | 2.5 | 6 | 9.0 | 57.5 | 43.5 |
| 58 | 63 | 83 | 88 | 70 | 78 | 4 | 85 | - | 85 | 25 | 71 | 14 | 2.5 | 6 | 9.0 | 62.5 | 48.5 |
| 60 | 65 | 85 | 90 | 72 | 80 | 4 | 95 | - | 95 | 25 | 81 | 14 | 2.5 | 6 | 9.0 | 62.5 | 48.5 |
| 63 | 68 | 88 | 93 | 75 | 83 | 4 | 95 | - | 95 | 25 | 81 | 14 | 2.5 | 6 | 9.0 | 62.5 | 48.5 |
| 65 | 70 | 90 | 95 | 77 | 85 | 4 | 95 | - | 95 | 25 | 81 | 14 | 2.5 | 6 | 9.0 | 62.5 | 48.5 |
| 70 | 75 | 99 | 104 | 83 | 92 | 4 | 95 | - | 95 | 28 | 79 | 16 | 2.5 | 7 | 9.0 | 70.0 | 54.0 |
| 75 | 80 | 104 | 109 | 88 | 97 | 4 | 105 | - | 105 | 28 | 89 | 16 | 2.5 | 7 | 9.0 | 70.0 | 54.0 |
| 80 | 85 | 109 | 114 | 95 | 105 | 4 | 105 | - | 105 | 28 | 87 | 18 | 3.0 | 7 | 9.0 | 70.0 | 52.0 |
| 85 | 90 | 114 | 119 | 100 | 110 | 4 | 105 | - | 105 | 28 | 87 | 18 | 3.0 | 7 | 9.0 | 75.0 | 57.0 |
| 90 | 95 | 119 | 124 | 105 | 115 | 4 | 105 | - | 105 | 28 | 87 | 18 | 3.0 | 7 | 9.0 | 75.0 | 57.0 |
| 95 | 100 | 124 | 129 | 110 | 120 | 4 | 105 | - | 105 | 28 | 87 | 18 | 3.0 | 7 | 9.0 | 75.0 | 57.0 |
| 100 | 105 | 129 | 134 | 115 | 125 | 4 | 105 | - | 105 | 28 | 87 | 18 | 3.0 | 7 | 9.0 | 75.0 | 57.0 |
l~1NB~ complies with EN 12756 (normal length, unbalanced) BT-RN.NB / KB Balanced - Dimensions in millimeter