Formed Metal Bellow
In this paragraph, I’m going to tell you about Formed Metal Bellows. First of all, they are reliable and have a long life. Also, formed metal bellows come in standard sizes ranging from 1-inch to 40-feet inside diameter. Thus, formed metal bellows a broad spectrum of pressure, temperature, flexibility, and movement requirements while conveying corrosive and non-corrosive fluids. Next, these bellows absorb axial extension and compression, parallel offset, angulation, or combinations of motions. However, our engineering assistance is available to you for your special applications or non-standard sizes.
Vacuum Applications
Formed Metal Bellows are used for high-vacuum applications. Therefore, requiring leakage rates less than 1 x 10-10 STD ATM CC/SEC at a base pressure of 1 x 10-6 TORR. Since most of these applications require extremely flexible bellows, Dannenbaum LLC recommends materials thickness of 0.006” for inside diameters (I.D.) up to 4.5”, 0.008” for I.D. up to 8.0”, and 0.010” for I.D. up to 14.” Material Thickness can be used, which has a maximum pressure (Column 7 on pages 6-17) exceeding 15 PSIG.
Beryllium Copper
The beryllium copper alloys have high thermal and electrical conductivity similar to pure copper and can be readily joined by resistance and fusion welding, brazing, and soldering. The material is nonsparking, nonmagnetic; it has high galling resistance and maintains its strength and ductility at cryogenic temperatures.
Multiply or Laminated Bellows
Bellows fabricated in any standard-size with multiply construction up to four plies of equal thickness. Furthermore, the maximum pressure, spring rate, and stability pressure are increased in direct proportion to the number of plies. But with the same axial deflection as a single ply. Multiply design permits a lower spring rate and a greater cycle life than a single-ply configuration for an equivalent pressure.
Read about expansion joints.