Metal Bellows Malaysia

metal bellows perform the function of sealing environments, carrying gases, liquids and slurry,
mechanical coupling, and performing electrical contact amongst other things. They are durable
and flexible when used within design specifications. metal bellows are cylindrical vessels
readily compressible and extensible as a result of numerous annular convolutions.
The most important specifications to consider when searching for metal bellows include inside
diameter, outside diameter, free length, and spring rate. The inside diameter specifies the
minimum inner diameter of the bellows. The outside diameter specifies the minimum outer
diameter of the bellows. The free length is the unloaded length of the bellows along the
convolutions. The spring rate is the spring force that the bellows applies. Common materials
of construction for metal bellows include aluminum, beryllium copper, brass, copper, Hastelloy,
Inconel, Monel, nickel, phosphor bronze, stainless steel, steel, tantalum, and titanium.
Methods of construction for metal bellows can be electroforming, chemical deposition, mechanical
forming, and welding. Electroformed bellows are made by depositing layers of metal, usually
nickel based, on a mandrel of aluminum. When the desired thickness is reached the mandrel is
melted away leaving behind the bellows. Chemical deposition is a method of forming bellows by
electro-depositing metal on a mandrel. Mechanically formed bellows include both roll-formed and
hydroformed types. Welded bellows are a series of convoluted rings or washers, which are
stacked on top of each other and welded on the inside and outside circumference.
Other important parameters to consider include profile or shape of the bellows, applications,
and features. Common profiles or shapes for metal bellows include round and square or
rectangular. Applications include aerospace, automotive, chemical, motion coupling, fluid
coupling, electrical contacts, HVAC, high purity, marine, petrochemical, and semiconductor.
Common features of metal bellows include cryogenic rated, flange, hermetic sealing, medically
rated, necks, and vacuum rated. Cryogenic rated bellows are used in cryogenic systems to handle
very low temperature gases. A flange is a fitting used to attach the bellows to equipment or
piping. Hermetic sealing on bellows is used in high and low pressure applications in either
liquid or gaseous media. Medically rated bellows are used in applications to insure a high
degree of sanitation. Necks are rigid tube-like lengths running from the end of the bellows.
Vacuum rated includes any vacuum application to very high vacuum. Suppliers of metal bellows
can often provide assembly services.