Welded Bellows Expansions JM1703 Edge Welded Bellows Metal Bellows Valves Bellows Welded Bellows, constructed by welding the inner and outer edges of a series of specially designed diaphragms, ensure optimal flexibility, vibration absorption, heat transfer and the perfect sealing of linear or rotary working parts. They are applied widely to such fields where high technologies such as vibration absorption, measurement of varying capacity, and adiabatic piping are required.