PU BG in the classic spherical bellows shape is created for applications where movement, vibration, and deviation are present. The flexible and strong design transfers minimal influence such as vibration or movement from the feeding or receiving equipment to the weighing or dosing equipment. This design excels in compensating large axial movements, such as compression or extension. The axial compression movement allows for easy 10 to 20 mm of deviation, or an absolute maximum of 50 mm. Two parts are thermoformed and welded together, to form a spherical bellow shape. Top and bottom part can be made from different polyurethane materials, however the standard is to use the same thickness for both parts to maintain maximum flexibility.
PU BG can be made in 0.7mm polyurethane (standard). Other thicknesses are optional, depending on the application.
| IDA+B | Ø OD mm | CL | FL | R | SESA&B |
|---|---|---|---|---|---|
| 114/4.5 | 164 | 90/3.5 | 50/2” | 25/1” | 40 |
| 100/4 | 150 | 90/3.5 | 50/2” | 25/1” | 40 |
| 75/3 | 125 | 90/3.5 | 50/2” | 25/1” | 20 |
| 60/2.5 | 110 | 90/3.5 | 50/2” | 25/1” | 20 |
| 50/2 | 100 | 90/3.5 | 50/2” | 25/1” | 20 |
| 40/1.5 | 90 | 90/3.5 | 50/2” | 25/1” | 20 |
| 120/5 | 170 | 50/2” | 25/1” | 40 | |
| 140/5.5 | 190 | 50/2” | 25/1” | 40 | |
| 150/6 | 200 | 50/2” | 25/1” | 40 | |
| 168/6.6 | 218 | 50/2” | 25/1” | 40 | |
| 200/8 | 250 | 50/2” | 25/1” | 40 | |
| 219/8.6 | 269 | 50/2” | 25/1” | 40 | |
| 250/10 | 300 | 50/2” | 25/1” | 40 | |
| 279/11 | 329 | 50/2” | 25/1” | 40 | |
| 300/12 | 350 | 90/3.5 | 50/2” | 25/1” | 40 |
| IDA+B | 40/1.5, 50/2, 60/2.5, 75/3, 100/4, 114/4.5, 120/5, 140/5.5, 150/6, 168/6.6, 200/8, 219/8.6, 250/10, 279/11, 300/12 |
|---|---|
| Ø OD mm | 100, 110, 125, 150, 164, 170, 190, 200, 218, 250, 269, 300, 329, 350, 90 |
| CL | 90/3.5 |
| FL | 50/2” |
| R | 25/1” |
| SESA&B | 20, 40 |
All poly urethane weighing bellow designs are available in a number of flexible materials. These materials can be combined together to form a 2 or 3 part fused weighing bellow. We offer transparent, blue metal detectable, white and antistatic poly urethane materials.
Food Contact Compliancy
All TPU films are food contact compliant according to international food contact regulations. PU-UF03, PU-UF07, PU-UF1, PU-UF15 and PU-UF3 have been migration tested for specific food contact compliancy, and comply with following regulations. Some other may only be available with a food contact compliancy declaration.
All TPU films are food contact compliant according to international food contact regulations. PU-UF03, PU-UF07, PU-UF1, PU-UF15 and PU-UF3 have been migration tested for specific food contact compliancy, and comply with following regulations. Some other may only be available with a food contact compliancy declaration.
United States Food contact safety regulations FDA 21 CFR
European Food Contact safety regulations
Chinese Food Contact regulations
Thermoforming
PU BG is made by thermoforming 2 or 3 parts from a poly urethane sheet material. Thermoforming the poly urethane sheet material results in a shaped part that does not have any height seam.
High Frequency Welding
All parts are welded together with high frequency (HF) welding equipment. Our latest HF welding equipment allows for seamless welds, creating a part comparable to a casted or molded part. All polyurethane (PU) flexible materials indicated for this product can be combined together to form the weighing bellow end product. Combinations between different thicknesses can be made. When thermoforming a PU sheet, the original thickness is reduced. This thickness reduction allows for an even more flexible bellow.
With the classic bellows shape, the standard practice is to use the same thickness for the top and bottom sections to maintain flexibility. However, it is possible to use a thicker material or materials with different thicknesses.
Polyurethane weighing bellows is one of the most customizable flexible connectors. It can be designed with the following coupling ends:
Flexible Connectors
Harmonica sleeves
JACOB Flexible Connections
Tri-Clamp Flexible Connections
Depending on your system requirements, more options can be added to your PU BG CFT.
Extended polyurethane weighing bellows
For pipes with great gaps or distance, silicone weighing bellows can be extended using the same material as the bellows.
1 or 2 sides extension
Integrated Reinforcement Rings
To withstand vacuum collapse or over pressure expansion.
Stainless Steel, 3mm / 5mm / 8mm (VR) PE 6x10mm poly ethylene (VRPE)
Earthing or Grounding
Earthing or grounding provides a path for fault currents to safely flow to the earth. This feature prevents potential hazards such as electrocution and equipment damage, thus promoting a safer workplace.
Earth connection on integrated rings with M6 Stud or Nut (VRA)
Sleeve within a sleeve
Inside Cone / Inside Sleeve (7) for applications in explosive environments
Padding on flange or cuff
Stitched on gasket on end cuffs (VF)
Label
RFID chip encased in Poly Urethane pocket
Pneumatic or Compressed Air Hoses
TPU compressed air hoses 8×5,5mm welded in.
Embossing
Embossed logo or marking welded in thermoplastic material
The top bellows and cuff are made in 0.7mm polyurethane (standard), 1.0 & 1.5mm Poly Urethane are optional. The bottom bellows and cuff are made in 0.7mm Poly Urethane (standard), 1.0 & 1.5mm Poly Urethane are optional. The standard is to use the same thickness for both parts to make the bellows as flexible as possible.
Some customers prefer to have the bottom part of the bellows in thicker polyurethane than the top. For instance a 0.7 mm top and a 1.5 mm bottom part. This allows the bottom section to retain its shape as much as possible while the top section provide the flexibility. This customized design also prevents powder piling up inside the bellow. It is also possible to opt for PU BG CFT or PU BG AC.
The cuffs on both sides can be extended to achieve a longer total length. Mostly the bottom cuff is extended. The cuff can also be cut to length using scissors. This can be done in production or on your own. Different thicknesses and color variations are possible.
Are you curious about the product?
Filcoflex specializes in the design
and manufacture of
Poly Urethane, silicone, rubber, and textile flexible connections for bulk product transport.
