Custom Eccentric Reducer Rubber Flexible Joint
DN30-DN3200
The Eccentric Reducer Rubber Expansion Joint is a specialized flexible piping component designed for systems requiring diameter transitions with an offset centerline. Unlike concentric models, its asymmetric structure eliminates air pockets and stagnant zones in horizontal pipelines, making it ideal for applications involving pumps, compressors, or gravity-fed fluid systems. It integrates high-elasticity rubber with reinforced layers to absorb axial, lateral, and angular displacements, isolate mechanical vibrations, and compensate for pipeline misalignment, while ensuring smooth media flow with minimal pressure loss.
Delivery
EXW,CIF,CFR,DAP
minimum order
1 piece
Supply Ability
100piece / Day
Country of Origin
China
Stock Time
15Day
Quantity:
US $1.00 - US $999.00
/ piece
Product Description
Product Description
The Eccentric Reducer Rubber Expansion Joint is a specialized flexible piping component designed for systems requiring diameter transitions with an offset centerline. Unlike concentric models, its asymmetric structure eliminates air pockets and stagnant zones in horizontal pipelines, making it ideal for applications involving pumps, compressors, or gravity-fed fluid systems. It integrates high-elasticity rubber with reinforced layers to absorb axial, lateral, and angular displacements, isolate mechanical vibrations, and compensate for pipeline misalignment, while ensuring smooth media flow with minimal pressure loss.
Core Structure
- Inner Elastomer Layer: Directly interfaces with the conveyed medium; material is tailored to media compatibility (e.g., EPDM for water/steam, NBR for oil, Viton® for corrosive chemicals).
- Reinforcement Layers: Multi-ply nylon cord fabric or polyester/Kevlar mesh, with optional embedded steel wire rings, to enhance pressure resistance and structural integrity under dynamic loads.
- Outer Rubber Layer: Provides protection against ozone, UV radiation, abrasion, and external environmental factors.
- Loose Flange Assembly: Carbon steel (or stainless steel for corrosion-prone environments) flanges with adjustable positioning, facilitating on-site alignment and installation.
Key Features
| Feature | Details |
|---|---|
| Eccentric Offset Design | Asymmetric centerline eliminates air pockets in horizontal pipelines, preventing cavitation in pump suction lines |
| Multi-Directional Displacement Compensation | Absorbs axial expansion/contraction, lateral offset, and angular deflection (≤15°) to reduce pipeline stress |
| Vibration & Noise Isolation | High-elasticity rubber dampens mechanical vibrations from rotating equipment, lowering system noise levels by 10-20 dB |
| Media Compatibility | Customizable elastomer options suit water, oil, chemicals, steam, and abrasive slurries |
| Easy Installation & Alignment | Loose flanges allow for adjustments to compensate for pipeline misalignment, reducing installation time and labor costs |
Technical Specifications (Typical)
- Working Pressure: PN6-PN25 (ANSI Class 125/150)
- Temperature Range: -20°C to 85°C (standard EPDM); -30°C to 250°C (special elastomers like Viton®/silicone)
- Offset Distance: Determined by diameter difference (e.g., DN200→DN100: offset ≈ 50 mm)
- Elastomer Options: EPDM (general-purpose), NBR (oil-resistant), CR (chemical-resistant), Viton® (high-temp/corrosive media), SBR (abrasive slurry)
- Reinforcement: Nylon cord fabric (standard) / polyester mesh + steel wire rings (high-pressure applications)
- Flange Standards: EN 1092-1, ASME B16.5, GB/T 9119
Typical Applications
This joint is widely used in HVAC systems, water treatment plants, petroleum refining, chemical processing, and power generation industries. It is particularly suitable for pump suction lines, horizontal pipeline diameter transitions, and systems where air entrapment or cavitation must be avoided. It replaces rigid metal eccentric reducers, extending the service life of connected equipment and reducing maintenance frequency.
Installation & Maintenance Notes
- Install with the flat side (small diameter end) facing upward in horizontal pipelines to eliminate air pockets; avoid inverted installation.
- Use control rods for large-diameter models to prevent over-extension or compression under dynamic loads.
- Ensure the selected elastomer is compatible with the conveyed medium to avoid chemical degradation.
- Conduct periodic inspections for cracks, bulges, or flange leaks; replace worn joints immediately to prevent system failure.
Detailed Photos
FAQ
a) How can I get more details about your products?You can send an email to our email address. We will provide catalogue and pictures of our products for your reference.We can also supply pipe fittings, bolt and nut, gaskets etc. We aim to be your piping system solution provider.
b) How can I get some samples?
If you need, we will offer you samples for free, but new customers are expected to pay express charge.
c) Do you provide customized parts?
Yes, you can give us drawings and we will manufacture accordingly.
d) To which country have you supplied your products?
We have supplied to Thailand, China Taiwan, Vietnam, India, South Africa, Sudan, Peru , Brazil, Trinidad and Tobago, Kuwait, Qatar, Sri Lanka, Pakistan, Romania, France, Spain, Germany, Belgium, Ukraine etc. (Figures here only include our customers in latest 5 years.).
e) I can't see the goods or touch the goods, how can I deal with the risk involved?
Our quality management system conforms to the requirement of ISO 9001:2015 verified by DNV. We are absolutely worth your trust. We can accept trial order to enhance mutual trust.
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