- Bellows OD, max./min
The bellows acceptable outside diameter range for the application. This helps to define the acceptable size envelope for the bellows. It is critical for tool selection and to optimize performance.
- Bellows ID, max./min
The bellows acceptable inside diameter range for the application. This helps to define the acceptable size envelope for the bellows.
- Effective Area
The mean diameter between OD and ID squared and multiplied by .785. It is the equivalent piston area that will produce the same fluid displacement as the bellows for the same axial compression or extension.
- Bellows Free Length
The manufactured length of the bellows convolutions, with the bellows at a neutral at rest position with no applied forces acting on it.
- Assembly Required
This lets the design engineer know if assembly of the bellows to end pieces is required.
- Bellows Material
The bellows material required for the application, if known.
- Temperature, Max/Min
The potential range of temperatures that the bellows or bellows assembly might be exposed to in the application.
- Operating Temperature
The temperature that the bellows or bellows assembly will experience during normal operation.
The type of environment or substances (gas, liquids, and materials) the bellows would be exposed to in the application.
- Pressure Responsive
What is the desired response with pressure changes?
- Leak Test Required
Determines whether the application requires the bellows or bellows assembly be leak tight.
- Leak Rate
If the bellows or bellows assembly is required to be leak tested, if known, give the required leak rate. The achievable leak rate will vary due to the design requirements (ID, OD, wall thickness, etc.)
- Operating Pressure
If the bellows needs to be leak tight, this is the differential pressure the bellows will be subjected to in the application. It is important to specify if the pressure will be applied internally or externally to the bellows.
- Maximum Internal Pressure
If the bellows needs to be leak tight, this is the maximum differential applied internally to the bellows, in the application.
- Maximum External Pressure
If the bellows needs to be leak tight, this is the maximum differential applied externally to the bellows, in the application.
In the application this is the axial deflection from its nominal free length that the bellows will see in compression.
The axial deflection from its nominal free length that the bellows will see in extension.
- Lateral Offset
The distance between the centerlines of the ends of the bellows that are parallel but not on the same line.
- Angular Offset
The angle between the centerlines of the ends of the bellows.
- Spring Rate
The force in pounds applied axially to a bellows, divided by the compression (or extension) in inches resulting from this force, and is a measure of stiffness. The value in the table is for small compression or extension not exceeding 10% of bellows convolutions length.
- Cycle Life
Number of cycles required for compression bending or offset movements. Loading is not a consideration.