Bellows Actuators | Edge Welded Bellows | Actuator Bellows

Overview

Bellows are used in actuator assemblies to transfer pressure or temperature into a linear motion. Edge welded bellows allow a long stroke, excellent media compatibility, and high temperature and pressure capabilities. Edge welded bellows also provide extreme flexibility in the design to fit size, weight, and movement requirements and allow the movement to be driven by internal or external forces. Bellows actuators can be used in valve applications, where pressure is internal or external to the bellows. Custom flanges, end pieces and hardware can be integrated into the assembly. With the extreme flexibility of edge welded bellows technology, axial movement and lateral offset are possible solutions. With sizes less than half an inch in diameter, bellows actuators can reduce the size of traditional actuators in hydraulic and pneumatic systems.

Outline of Bellows Actuator showing the shaft motion with pressure applied

Specifications (Bellows Actuators - PDF)
Common Materials	AM350, 304L, 347, 316L SS, Titanium, Hastelloy, and Inconel
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

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
Hydraulic Systems	Stroke Ratio
Pneumatic Cylinders	Repeatability

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Actuators

Overview

Specifications (Bellows Actuators - PDF)

Edge Welded Metal Bellows Diaphragm Specifications

Typical Industries

Benefits

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