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Products > Bellows / Couplings > Bellows Assemblies

Aneroid Bellows Assemblies

Aneroid bellows assemblies are designed to convert changes in pressure into linear displacement. A bellows is a thin-walled convoluted tube that is leak-tight and can compress or extend axially along its convoluted length. When the bellows are assembled to end pieces that close off the ends, it will then respond when the pressure outside of the assembly is different than the pressure inside. The bellows assembly will react by extending or compressing in precise response to the differential pressure.

“As analog solutions in a digital world,” aneroid bellows can replace or back up electronic and digital sensors with no electricity needed. Our bellows are more customizable and create fewer potential points of failure.

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Custom Aneroid Assemblies

MW Components is a leader in bellows manufacturing, producing metal bellows using three distinct methods (Electrodepositing, Hydroforming, and Edge-Welded Technology). Each process allows for different ranges in pressure, temperature, and tolerances. To view the differences in these processes and see which process may be right for your custom bellows assembly project, review our Bellows Technology Comparison Guide.

No matter the size of your project, we are here to help. Our engineering and manufacturing experts add value by offering optional design, tooling, and prototyping support as needed. Let us help you bring your ideas to life.

Send us your specs or configure an assembly.

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Stops – Some aneroids are “free” or unstopped, where the assembly’s movement is not constrained by any physical feature. It will respond freely and immediately to any change in pressure. Others contain a stop, which restricts compression beyond a certain distance.

Springs – Many aneroid assemblies include a spring in parallel with bellows. The bellows and spring each contribute to the overall stiffness of the assembly.

Adjustment features – Sometimes a thread or a stud, is part of the design. This makes it possible to preload the assembly in the installation, allowing the user to “tune” its performance.


  • Altimeters to help sense altitude changes
  • Aircraft fuel valves to modulate fuel mixture as atmospheric pressure changes due to altitude
  • Personal air tanks for HALO jumps to regulate air composition as pressure/altitude changes
  • Depth sensors in undersea applications (especially redundant sensors that need no electrical power)
  • Any application where the designer needs to actuate something in response to a pressure change

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