Bellows Mechanical Seals

Overview

Mechanical seals with bellows technology have various benefits and applications.  Edge welded bellows technology allows for a variety of materials including stainless steel, Inconel®, and Hastelloy®.  With these options, various liquids and gases can be measured as well as extreme temperatures.  Bellows mechanical seals can eliminate O-rings to increase compatibility and reduce potential leak paths.

The metal bellows design allows for higher flow rates and less clogging than traditional spring seals.  Bellows technology creates a uniform outside wall for uniform movement under hydraulic pressure.  With precision stamping and proprietary welding techniques, BellowsTech manufactures its edge welded bellows within tight tolerances in its Ormond Beach, Florida facility.  Mechanical seals can be manufactured with O-ring grooves, flanges, and carbon-face seals to make the best possible connection to customer assemblies.

BellowsTech mechanical seals are 100% visually inspected throughout the manufacturing process and confirmed with mass spectrometer testing.  BellowsTech can offer various sizes and stroke lengths to satisfy custom demands.

Applications in the aerospace, oil, gas, petrochemical, pharmaceutical, water and paper industries are common markets for bellows mechanical seals, due to their reliability, tight tolerances, and compatibility with harsh media in pump systems.

Specifications - Bellows Mechanical Seals - PDF

Common Materials AM350, 316L SS, Inconel®, & 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)
0036A0.3580.2000.06110.079
0040A0.3960.20.06970.098
0048A0.4770.1980.08950.1395
0050A0.4960.20.09510.148
0060A0.5950.260.14350.1675
0067A0.670.3940.22230.138
0075A0.750.260.20030.245
0082A0.8210.5480.36800.1365
0083A0.8270.5750.38590.126
0084A0.8380.50.35150.169
0089A0.8920.5920.43240.15
0102A1.0220.6830.57080.1695
0103A1.030.540.48400.245
0103B1.030.540.48400.245
0103C1.030.540.48400.245
0103D1.030.550.49020.24
0108A1.080.860.73900.11
0117A1.170.750.72380.21
0118A1.1810.8860.83890.1475
0124A1.240.660.70880.29
0133A1.331.0151.07970.1575
0136A1.3550.540.70510.4075
0136B1.3621.0121.10660.175
0144A1.4370.9371.10660.25
0150A1.511.22720.25
0151A1.5111.1861.42820.1625
0156A1.560.8651.15470.3475
0163A1.6250.751.10750.4375
0163B1.6250.9371.28880.344
0165A1.651.241.63990.205
0174A1.7381.3631.88810.1875
0175A1.750.751.22720.5
0175B1.7511.48490.375
0176A1.7591.3051.84330.227
0188A1.8750.9751.59480.45
0189A1.891.392.11240.25
0190A1.91.52.26980.2
0193A1.9251.21.91750.3625
0195A1.9501.5572.41490.1965
0200A21.252.07390.375
0219A2.1901.6902.95590.250
0224A2.2441.6252.93920.3095
0225A2.251.52.76120.375
0244B2.4371.9373.75650.25
0245A2.451.653.30060.4
0260A2.61.783.76680.41
0260B2.5952.1854.48630.205
0263A2.6252.1254.43010.25
0265A2.6524.24560.325
0270A2.71.954.24560.375
0275A2.752.1254.66640.3125
0275B2.752.1254.66640.3125
0275C2.751.653.80130.55
0276A2.761.9654.38360.3975
0300A324.90870.5
0300B324.90870.5
0317B3.1652.5856.49180.29
0331A3.3052.817.34210.2475
0331C3.3052.817.34210.2475
0350A3.52.757.66990.375
0368A3.6752.537.55990.5725
0403A4.0343.0859.95100.4745
0403B4.0343.0859.95100.4745
0417A4.173.712.16130.235
0420A4.23.411.34110.4
0472A4.723.7213.98670.5
0475A4.753.0311.88470.86
0490A4.93.5313.95360.685
0490B4.9034.32316.71310.29
0497A4.97415.79850.485
0508A5.0774.1316.64430.4735
0545A5.454.9521.23720.25
0572A5.7224.47220.40420.625
0588A5.885.1223.75830.38
0675A6.755.54229.66710.604
0728A7.2835.90634.15490.6885
0775A7.756.8541.85390.45
0785A7.856.2539.03630.8
0787A7.8746.69341.66490.5905
0808A8.0837.1545.56180.4665
0925A9.25858.42630.625
0950A9.58.563.61730.5
1099A10.9910.1287.49970.435
1100A119.582.51590.75
1110A11.1029.10280.15021
1200A121095.03321
2221A22.20519.921348.44191.142
Bellows Mechanical Seal

Typical Industries

Benefits

Oil and Gas Media Compatibility
Petrochemical Eliminates Springs and O-Rings
Water Leak Tight Seals
Pharmaceutical Various Materials