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RUBBER BELLOWS

When it comes to automobiles, the rubber bellows are extremely important components, especially with the steering of your vehicle. The bellows are designed to keep derbis and dirt out of the steering rack, the rubber bellow is a cylindrical vessel and it comes in a variety of shapes, sizes, construction and elastomer coated rubbers/fabrics to suit diverse application requirements of your vehicle. Due to the different annular convolutions, rubber bellows are easily and compressible and are appreciated for providing great cushioning effects. The bellows are used to cover, protect and enhance the service life of various machine parts like, spindles, screws, guide ways, shafts, cylinders, pistons and more from dust and other unknown particles.

Apart from automotive rubber bellows that are used in automobiles, there are also other applications for it in motion coupling, chemical, electrical contacts, petrochemical, HVAC among others.

Materials that are used in rubber bellows:

Depending on the end use requirements of the rubber bellow, it will be manufactured using many different synthetic polymers such as:
• Neoprene
• SBR
• HNBR
• Ethylene Propylene Diene Monomer (EPM, EPDM), etc.

Rubber Bellow application areas:

Usually rubber bellows are designed in hand-built and moulded variety, they are available in many different sizes as well as specifications to cater a variety of general industrial and automotive applications.
Rubber bellows are often used in the following industrial segments/applications:
• Automotive: Marine
• Aerospace: HVAC (heating, air conditioning and ventilation)
• Electrical contacts: Petrochemical
• Chemical: Motion Coupling
• Fluid Coupling: Semiconductor

When buying rubber bellows you should consider the following features:
• Shape of the rubber bellow (round, rectangular, square, c-type, tapered, octagon, hexagon, polygon etc)
• Inside diameter of the rubber bellow
• Outside diameter of the rubber bellow
• Material used when designing the rubber bellow (the inside material should be suited to oil, grease and lubricants, the outside should be susceptible to conditions like ozone and UV)
• The spring force or spring rate that the bellow applies
• The unloaded or free length of the rubber bellow along the convolutions.

At D & D Valves we specialise in all types of valves and engineering supplies, visit our website on www.ddvalve.co.za for more information.

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