Hydroformed Metal Bellows
Metal bellows are cylindrical vessels readily compressible and extensible
as a result of numerous annular convolutions. Metal Bellows made by Gardner
are produced by the Hydroforming process. This process produces bellows
characterized by smooth contours, uniform wall thickness and minimized stress
concentration. Gardner fabrication techniques and equipment are unique in
the Hydroformed Bellows industry and are directed toward making uniform quality
bellows of optimum configuration in a wide range of sizes and quantities.
Type 321/347 Stainless Steel, Inconel 600, Inconel 625, Inconel 718,
Haynes 188, AM-350, Titanium, and Aluminum are used. Inconel 625 is
generally the first material choice. For higher performance, Inconel 718
is used. Titanium is used for applications requiring the highest performance
bellows and also for applications requiring the unique corrosion resistance
of titanium. Aluminum is used occasionally, but it cannot be used to produce
high performance bellows.
Regular Convolute Bellows State of the Art conventional
convolute bellows are the bellows of choice for most applications. These
bellows normally have omega shaped convolutes which allows complete cleaning.
Nested Convolute Bellows Developed by GBC
the Hydroform Nesting Bellows provides a much greater ratio of extended to
compressed length than regular convolute bellows. Nested convolute bellows
are particularly suited for application in accumulators and expulsion devices
requiring high volumetric efficiency.
Tubing Bellows quality is directly dependent
upon the quality of the tubing used. It follows, therefore, that precision
bellows require precision tubing. For bellows service, the best tubing is
obtained by butt-welding precision strip. Seamless tubing, although more
structurally homogeneous, suffers from a greater variation of wall thickness.
Precision butt-welded tubing made to exacting requirements is produced on
Gardner proprietary tube making equipment.
Multi-Ply Bellows Gardner hydroformed bellows
are fabricated from single-ply or multi-ply tubing. Multi-ply bellows can
provide lower stiffness for a given pressure strength. Ply thicknesses of
.006" to .062" are usual for welded tubing, .003" to .031" for redrawn tubing,
and .003" and .004" are used with seamless tubing sizes 1/2" and under.
Bellows pressure capabilities go as high as 8,000 psi.
Current capabilities include 3/16" I.D. to 27" O.D., Length to 300 inches.
Wall thickness .003" to .125". Other sizes available upon request.
Gardner Bellows Corporation is pleased to offer bellows application assistance
backed by extensive analytical skills and 39 years of successful experience.
Given bellows envelope and functional requirements GBC engineering will
develop an optimal bellows design.
Manufacturing is controlled under a careful system of Quality Assurance which
meets the requirements of MIL-Q-9858 and MIL-I-45208 amended and augmented
by Customer's special requirements.
This page updated on October 28, 2003.
Copyright © 2003 Gardner Bellows Corporation