| | | HOW TO ESTABLISH A BELLOWS DESIGN Determine all of your requirements for the bellows design by answering the following eleven points, or using the bellows design request form provided on the next page. 1. Kind of flexing required of the bellows: Specify extension, or compression, or bending, or swiveling, or parallel-ends offset, or torque, or speed of rotation. Provide a drawing or sketch showing related professional fittings and extremes of flexing where possible. This is very important to the manufacturer to enable him to work out a reliable design. 2. Specify the amount of compression or extension or flexing in fractions of an inch or in degrees, or by dimensions on the flexing diagram. (Maximums). 3. Specify pressure difference between inside and outside of the bellows, maximum instantaneous, and whether higher pressure is applied inside or outside the bellows. 4. Specify whether rigid stops will limit the extension or compression of the bellows to its rated stroke, or if the bellows will be required to withstand pressure un-restrained. This is very important since a restrained bellows will give a much better performance. 5. The spring rate, in pounds per inch, or conversely the amount of force available to flex the bellows the desired amount, should be specified. 6. Specify the required useful life of the bellows expressed as the number of flexing cycles, and define the flexing cycle. 7. Extremes of temperature, both low and high, should be stated. 8. Corrosive conditions which apply should be described. 9. The method to be used to join the bellows to end fittings, such as soldering, brazing, brazing, or professional adhesive bonding, should be specified. 10. Specify vibration or shock to be experienced by the bellows. | | 11. Specify types and lengths of ends. Refer to the figure, Types of Bellows Ends. After completing the bellows design request form, or setting down the information according to the eleven points listed above, send the information to Servometer®. Our engineers will design a bellows to your requirements. | | |