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Eccentric reducing rubber expansion joints, commonly known as eccentric reducer rubber expansion joints or eccentric reducing vibration isolators, feature an eccentric reducing structure with one flat end and one angled end. They are specifically designed for preventing gas accumulation and cavitation in horizontal pipelines, while also providing triple functions of reducing diameter, vibration reduction, and displacement compensation.
1. Eccentric Rubber Sphere: Inner rubber (media resistant) + multi-layer nylon cord reinforcement + outer rubber (aging resistant), flat top and angled bottom, integrally vulcanized.
2. Carbon Steel Loose Flange: Rotatable for easy hole alignment and installation.
3. End Reinforcement Metal Ring: Enhances end strength and prevents tearing.
4. Optional Limiting Device: Prevents pull-out under high-pressure conditions.
Eccentric Reduction: The two ends have different diameters, with the top flat and the bottom angled. When installed horizontally, there is no air pocket at the top and no accumulation of impurities at the bottom.
Flexible Compensation: The rubber elasticity absorbs axial, lateral, and angular displacements, adapting to installation deviations and thermal expansion and contraction.
Vibration Reduction and Noise Reduction: Isolates pump/equipment vibration, reducing noise by 20-30dB and protecting the pipeline network.
Anti-Cavitation: The pump inlet's "top-flat" design prevents air intake and eliminates cavitation damage to the pump body.
1. Anti-Gas Accumulation and Anti-Cavitation: Horizontal installation with a flat top, no air pockets, essential for pump inlets.
2. Smooth Sludge Discharge: Sloping bottom prevents sewage/particulate media from accumulating or clogging.
3. Multi-functional: Reducer + flexible joint + vibration damping, eliminates the need for reducers and flanges, reducing leakage points.
4. Flexible Installation: Rotatable flange accommodates pipe misalignment and flange non-parallelism.
5. Corrosion and Durability: Suitable for water/sewage/oil/acids and alkalis, with a lifespan of 5-10 years.
1. Pump Inlet: Horizontal pipe, prevents cavitation and gas accumulation, protecting the pump body.
2. Horizontal Water Supply/Drainage/Fire Protection: Main and branch pipe diameter changes.
3. Sewage Treatment/Rainwater Pipes: For media containing impurities, prevents siltation and facilitates sludge discharge.
4. HVAC/Air Conditioning Circulating Water: Horizontal pipe diameter change, vibration damping and noise reduction.
5. Chemical/Oil Pipelines: For gaseous/particulate media, suitable for corrosive conditions.
1. Installation Direction: Top-down installation (larger inlet at the top, smaller inlet at the bottom), inversion is strictly prohibited.
2. Flow Direction: Larger inlet in, smaller inlet out; media flows from the larger end to the smaller end.
3. Fixed Supports: Fixed supports are installed at both ends to balance internal pressure thrust.
4. Anti-pull-out: For PN≥1.6MPa or pump outlet, a limit rod is installed.
| Item\Model | KYP(DN50~300) | KYP(DN350~600) | Remark |
| Working pressure MPa | 1.0(10) | 0.6(6) | For media such as oil, acids, and alkalis, or those with special operating temperature requirements, we can also customize products by sending us a letter or drawing. Please specify this when ordering. |
| Explosion pressure (MPa) | <1.8 | <1.5 | |
| Vacuum degree Kpa | 86.7 | 53.3 | |
| Applicable temperature℃ | -20℃ to +115℃; special models can reach -30℃ to +250℃. | ||
| Applicable media | Air, compressed air, water, seawater, hot water, oil, acids and alkalis | ||
| DN large × DN small | Length L mm |
Axial displacement(mm) | Lateral displacement mm |
deflection angle(α₁+α₂)° | |
| elongation | compression | ||||
| 50×40 | 180 | 20 | 30 | 45 | 35 |
| 65×40 | 180 | 20 | 30 | 45 | 35 |
| 65×50 | 180 | 20 | 30 | 45 | 35 |
| 80×50 | 180 | 20 | 30 | 45 | 35 |
| 80×65 | 180 | 20 | 30 | 45 | 35 |
| 100×50 | 180 | 20 | 30 | 45 | 35 |
| 100×65 | 180 | 20 | 30 | 45 | 35 |
| 100×80 | 180 | 20 | 30 | 45 | 35 |
| 125×65 | 180 | 20 | 30 | 45 | 35 |
| 125×80 | 180 | 20 | 30 | 45 | 35 |
| 125×100 | 180 | 22 | 30 | 40 | 35 |
| 150×80 | 200 | 22 | 30 | 40 | 35 |
| 150×100 | 200 | 20 | 30 | 45 | 35 |
| 150×125 | 200 | 22 | 30 | 40 | 35 |
| 200×100 | 220 | 22 | 30 | 40 | 35 |
| 200×125 | 220 | 22 | 35 | 40 | 30 |
| 200×150 | 220 | 25 | 30 | 40 | 35 |
| 250×100 | 220 | 22 | 35 | 40 | 30 |
| 250×125 | 220 | 25 | 35 | 40 | 30 |
| 250×150 | 220 | 25 | 35 | 40 | 30 |
| 250×200 | 220 | 25 | 35 | 40 | 30 |
| 300×150 | 220 | 25 | 35 | 40 | 30 |
| 300×200 | 220 | 25 | 35 | 40 | 30 |
| 300×250 | 220 | 25 | 35 | 40 | 30 |
| 350×200 | 230 | 28 | 38 | 40 | 26 |
| 350×250 | 230 | 28 | 38 | 35 | 26 |
| 350×300 | 230 | 28 | 38 | 35 | 26 |
| 400×200 | 240 | 28 | 38 | 35 | 26 |
| 400×250 | 240 | 28 | 38 | 35 | 26 |
| 400×300 | 240 | 28 | 38 | 35 | 26 |
