Rubber Coupling Stainless Steel Flange End Face Fully Sealed Flexible Connector Rubber Expansion Joint
Rubber Coupling Stainless Steel Flange End Face Fully Sealed Flexible Connector Rubber Expansion Joint
Flanged rubber joints (also known as flanged rubber joints, rubber flange flexible joints) are a common pipe connection component, mainly used to absorb pipe vibration, compensate for displacement and reduce noise.
Structure and composition
Rubber body: usually made of oil-resistant, corrosion-resistant, and high-temperature resistant rubber (such as NBR, EPDM, CR, etc.).
Reinforcement layer: multiple layers of polyester cord or steel wire skeleton to improve pressure bearing capacity.
Flanged part: the edge of the rubber joint is folded outward, fits with the flange, and is fixed by bolts.
Flange: mostly made of carbon steel or stainless steel, connected to the pipeline flange.
Main features
Good sealing: The flange design increases the contact area to prevent medium leakage.
Shock absorption and noise reduction: The rubber elasticity absorbs pipeline vibration and impact.
Compensation displacement: It can be displaced axially, laterally or angularly to alleviate thermal expansion and contraction or installation errors.
Pressure and temperature resistance: The working pressure is usually 0.6~2.5MPa, and the temperature range is -20℃~120℃ (depending on the material).
| Main connection dimension | ||||||
| Nominal diameter |
Length (mm) |
Axial displacement | Horizontal movement | Deflection angle | ||
| mm | Inch | Extension | Compression | |||
| 32 | 1 1/4 | 95 | 6 | 9 | 9 | 15° |
| 40 | 1 1/2 | 95 | 6 | 10 | 9 | 15° |
| 50 | 2 | 105 | 7 | 10 | 10 | 15° |
| 65 | 2 1/2 | 115 | 7 | 13 | 11 | 15° |
| 80 | 3 | 135 | 8 | 15 | 12 | 15° |
| 100 | 4 | 150 | 10 | 19 | 13 | 15° |
| 125 | 5 | 165 | 12 | 19 | 13 | 15° |
| 150 | 6 | 180 | 12 | 20 | 14 | 15° |
| 200 | 8 | 210 | 16 | 25 | 22 | 15° |
| 250 | 10 | 230 | 16 | 25 | 22 | 15° |
| 300 | 12 | 245 | 16 | 25 | 22 | 15° |
| 350 | 14 | 255 | 16 | 25 | 22 | 15° |
| 400 | 16 | 255 | 16 | 25 | 22 | 15° |
| 450 | 18 | 255 | 16 | 25 | 22 | 15° |
| 500 | 20 | 255 | 16 | 25 | 22 | 15° |
| 600 | 24 | 260 | 16 | 25 | 22 | 15° |
| 700 | 28 | 260 | 16 | 25 | 22 | 15° |
| 800 | 32 | 260 | 16 | 25 | 22 | 15° |
Common types
Single ball flanged rubber joint: suitable for general pipes.
Double ball flanged rubber joint: larger compensation and stronger flexibility.
Reducing diameter flanged rubber joint: connects pipes of different diameters.
Acid and alkali resistant/high temperature resistant type: special rubber material adapts to harsh environments.
Single sphere rubber joint Double sphere rubber joint
Reducing rubber joint Food grade rubber joint
Difference from ordinary rubber joints
Pressure bearing capacity: The flange structure is more suitable for high-pressure occasions.
Installation method: The flange joint is directly fixed by flange bolts
Selection points
Medium: Select matching rubber material (such as EPDM acid and alkali resistance, NBR oil resistance).
Pressure level: Select according to the system working pressure.
Displacement requirements: Determine the axial, lateral or angular compensation.
Flange standard: Match the national standard (GB), American standard (ANSI), German standard (DIN), etc.
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