Bellows Accumulators

Metal bellows accumulators are used in a variety of industries to store the energy of a liquid or gas. Edge welded bellows technology is an ideal fit for this application, due to its media compatibility and stroke length capability. Edge welded bellows can also be manufactured in a variety of materials to match the application’s media compatibility requirements. With the right material, metal bellows can operate from cryogenic temperatures to 1500°F.

Hydraulically formed, or hydroformed, bellows can typically travel about twenty percent of their free length. Edge welded metal bellows have the ability to travel ninety percent; thus, edge welded bellows can accomplish the same movement in smaller sizes and lighter weight assemblies. Bellows accumulators can have pressure internal or external to the bellows assembly. This design factor should be defined early in the design phase since the assembly. Understanding the differential pressure between the inside and outside of the assembly also helps engineers to determine the proper size and length of the bellows accumulator.

BellowsTech has engineering design experience in a multitude of applications resulting in manufacturing a variety of accumulator sizes and shapes. With over eighty standard diaphragms to choose from, engineers have the ability to select the right size for the application. BellowsTech is also capable of manufacturing bellows up to 96” in length.

Guides and over-travel stops can be integrated into the design. In order to prevent “squirm,” guides ensure that the bellows assembly is moving in the intended direction. Over-travel stops can prevent bellows expansion from over-pressure conditions. Special housings can be designed to contain pressure as well as allow input and output pressure ports to customer design needs.

Specifications (Bellows Accumulators - PDF)
Common Materials	AM350, 316L SS, Inconel®, Titanium, & Hastelloy® 276C
Thickness	0.002″ and up every 0.001″
Standard Leak Rate	<1×10^-9 std CC He/sec**
Size Ranges
Outside Diameter	0.358″ (9.0932mm) to 22.205″ (564mm)*
Inside Diameter	0.198″ (5.029mm) to 19.921″ (505.99mm)*
Shapes	Round standard. Non-Round Available; Contact Factory.
Length	Up to 96 inches (244 cm)
For other dimensional requirements, contact the factory*Confirm leak rate with material selected.

Edge Welded Metal Bellows Diaphragm Specifications
Use the following table as a guide for configuring your metal bellows. BellowsTech currently offers over 80 standard sizes. The list can be sorted by each column, searched through the search box at the top-right and expanded by increasing the number of visible entries. For custom sizes, contact us and our design engineers will work with you to find the best solution.

Diaphragm # Outside
Diameter
(OD) Inside
Diameter
(ID) Mean effective
pressure area
MEA (inches^2) Radial Span
(inches)

0036A 0.358 0.200 0.0611 0.079

0040A 0.396 0.2 0.0697 0.098

0048A 0.477 0.198 0.0895 0.1395

0050A 0.496 0.2 0.0951 0.148

0060A 0.595 0.26 0.1435 0.1675

0067A 0.67 0.394 0.2223 0.138

0075A 0.75 0.26 0.2003 0.245

0082A 0.821 0.548 0.3680 0.1365

0083A 0.827 0.575 0.3859 0.126

0084A 0.838 0.5 0.3515 0.169

0089A 0.892 0.592 0.4324 0.15

0102A 1.022 0.683 0.5708 0.1695

0103A 1.03 0.54 0.4840 0.245

0103B 1.03 0.54 0.4840 0.245

0103C 1.03 0.54 0.4840 0.245

0103D 1.03 0.55 0.4902 0.24

0108A 1.08 0.86 0.7390 0.11

0117A 1.17 0.75 0.7238 0.21

0118A 1.181 0.886 0.8389 0.1475

0124A 1.24 0.66 0.7088 0.29

0133A 1.33 1.015 1.0797 0.1575

0136A 1.355 0.54 0.7051 0.4075

0136B 1.362 1.012 1.1066 0.175

0144A 1.437 0.937 1.1066 0.25

0150A 1.5 1 1.2272 0.25

0151A 1.511 1.186 1.4282 0.1625

0156A 1.56 0.865 1.1547 0.3475

0163A 1.625 0.75 1.1075 0.4375

0163B 1.625 0.937 1.2888 0.344

0165A 1.65 1.24 1.6399 0.205

0174A 1.738 1.363 1.8881 0.1875

0175A 1.75 0.75 1.2272 0.5

0175B 1.75 1 1.4849 0.375

0176A 1.759 1.305 1.8433 0.227

0188A 1.875 0.975 1.5948 0.45

0189A 1.89 1.39 2.1124 0.25

0190A 1.9 1.5 2.2698 0.2

0193A 1.925 1.2 1.9175 0.3625

0195A 1.950 1.557 2.4149 0.1965

0200A 2 1.25 2.0739 0.375

0219A 2.190 1.690 2.9559 0.250

0224A 2.244 1.625 2.9392 0.3095

0225A 2.25 1.5 2.7612 0.375

0244B 2.437 1.937 3.7565 0.25

0245A 2.45 1.65 3.3006 0.4

0260A 2.6 1.78 3.7668 0.41

0260B 2.595 2.185 4.4863 0.205

0263A 2.625 2.125 4.4301 0.25

0265A 2.65 2 4.2456 0.325

0270A 2.7 1.95 4.2456 0.375

0275A 2.75 2.125 4.6664 0.3125

0275B 2.75 2.125 4.6664 0.3125

0275C 2.75 1.65 3.8013 0.55

0276A 2.76 1.965 4.3836 0.3975

0300A 3 2 4.9087 0.5

0300B 3 2 4.9087 0.5

0317B 3.165 2.585 6.4918 0.29

0331A 3.305 2.81 7.3421 0.2475

0331C 3.305 2.81 7.3421 0.2475

0350A 3.5 2.75 7.6699 0.375

0368A 3.675 2.53 7.5599 0.5725

0403A 4.034 3.085 9.9510 0.4745

0403B 4.034 3.085 9.9510 0.4745

0417A 4.17 3.7 12.1613 0.235

0420A 4.2 3.4 11.3411 0.4

0472A 4.72 3.72 13.9867 0.5

0475A 4.75 3.03 11.8847 0.86

0490A 4.9 3.53 13.9536 0.685

0490B 4.903 4.323 16.7131 0.29

0497A 4.97 4 15.7985 0.485

0508A 5.077 4.13 16.6443 0.4735

0545A 5.45 4.95 21.2372 0.25

0572A 5.722 4.472 20.4042 0.625

0588A 5.88 5.12 23.7583 0.38

0675A 6.75 5.542 29.6671 0.604

0728A 7.283 5.906 34.1549 0.6885

0775A 7.75 6.85 41.8539 0.45

0785A 7.85 6.25 39.0363 0.8

0787A 7.874 6.693 41.6649 0.5905

0808A 8.083 7.15 45.5618 0.4665

0925A 9.25 8 58.4263 0.625

0950A 9.5 8.5 63.6173 0.5

1099A 10.99 10.12 87.4997 0.435

1100A 11 9.5 82.5159 0.75

1110A 11.102 9.102 80.1502 1

1200A 12 10 95.0332 1

2221A 22.205 19.921 348.4419 1.142

Typical Industries	Benefits
Aerospace	Media Compatibility
Industrial Gases	Eliminates Springs and O-Rings
Oil and Gas	Reduce Sized from Longer Stroke
Sub-Sea Controls	Light-weight

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Specifications (Bellows Accumulators - PDF)

Edge Welded Metal Bellows Diaphragm Specifications

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