Datwyler TM brand bellows and convoluted rubber dust boots are versatile seals used in a wide range of applications to seal dust and other environmental elements in applications with a stroke or designed range of motion. Rubber bellows and convoluted dust boots can be custom designed for the application and are available in a range of rubber materials including EPDM, TPE and Silicone.
In many applications bellow ventilation is a critical design feature to prevent pressure or vacuum conditions when the rubber bellow is actuated in the application. Ventilation can be accomplished in a number of manners, but typically is accomplished with the addition of breather holes in the bellow. For harsh environments, Datwyler has a range of filters that can be molded into the assembled bellow to help prevent the introduction of large foreign particles into the application. In addition to breather holes Columbia also offers various types of custom assembly interfaces as shown below.
Rubber Bellows Connectors function as the interface between the convoluted bellows region of the boot and the assembly (application) and are used to secure the two ends of the bellow to the assembly. Connectors are highly customized to unique application interfaces and can be designed to include holes, mechanical locks, clamping surfaces and many other features. A sampling of these designs are detailed as follows:
Datwyler TM brand Rubber Bellows and dust boots are available in a range of performance rubber, TPE, and silicone materials specifically engineered for a variety of applications. Customers can select from our current material catalogue or we can develop a new material for your unique application. The more common materials utilized for below applications are as follows:
RUBBER COUMPOUNDS TYPES AND REFERENCES
Material |
Abbreviation
|
Temperature
Range (dry heat) |
Aging
Weathering,
Ozone |
Resistance to
Oil & Grease |
Water Swell
Resistance |
Flex-Fatigue |
Economy of
Material |
Material Notes |
| Chloroprene (Neoprene) |
CR
|
-40F to 250F
|
Good
|
Good
|
Average
|
Very Good
|
Good
|
exposure to refrigerants, can be compounded for FDA applications
|
| Nitrile |
NBR
|
-22F to 212F
|
Poor
|
Very Good
|
Good
|
Good
|
Very Good
|
excellent resistance to petroleum based oils and hydrocarbon fuels
|
| Ethylene-Propylene |
EPDM, EPM
|
-60F to 300F
|
Very Good
|
Poor
|
Very Good
|
Good
|
Very Good
|
|
| Silicone |
VMQ
|
-75F to 450F
|
Very Good
|
Average
|
Very Good
|
Very Good
|
Average
|
medical and aerospace applications
|
| Fluorocarbon |
FKM
|
5F to 390F
|
Very Good
|
Very Good
|
Good
|
Average
|
Poor
|
|
Rubber Bellows can be engineered in a number of structures to meet various application requirements. The most common structure is composed of two connectors and a convolution region where the connectors provide the assembly interface and the convolution (bellows) region provides for the design application travel. These features are detailed as follows:
| |
|
| Feature: |
Reference: |
Requirement: |
| A1 |
Connector 1 |
Inside Diameter (ID) |
| A2 |
Connector 1 |
Connector Height |
| A3 |
Connector 2 |
Inside Diameter (ID) |
| A4 |
Connector 2 |
Connector Height |
| L - max |
Bellows Length |
Maximum Extension |
| L -min |
Bellows Length |
Minimum Extension |
| C1 - min |
Bellows ID |
Application Min. Allowable (ID) |
| C2 - max |
Bellows ID |
Application Max Allowable (ID) |
| D1 |
Bellows Wall |
Wall Thickness - Continuous |
| E1 |
Bellow OD |
Application Max Allowable (OD) |
Custom Design and Manufactured for Your Application
Datwyler's experienced team can develop and manufacture a Custom Bellow designed specifically for your application. Please forward your application details, prints & specifications or contact our bellow team.
Custom Bellow Manufacturing & Design
» Design Optimized for
Application Envelope
» Convolutions Design
Optimization for Proper
Folding, Extended &
Collapsed Lengths
» Custom Flange &
Connectors Designs
» Over 500 pre-engineered bellow designs available
» Quick search tool to compare available designs to application requirements
Types Include: - Multi-convolute & single-convolute bellows
- Straight & tapered bellows
» Online ordering for both stock & special run bellows
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