Eccentric Reducer Hand-Made Rubber Expansion Joint

The Eccentric Reducer Hand-Made Rubber Expansion Joint is a flexible pipeline connector designed for connecting pipes with different diameters whose centerlines are not aligned. Manufactured through a hand-built layering process, it offers excellent flexibility, sealing performance, and vibration isolation, making it widely used in HVAC, water supply, chemical, and pump systems.

1. Product Structure

This type of rubber expansion joint typically consists of:

Inner Rubber Layer: Resistant to various media such as water, oil, acids, and alkalis
Reinforcement Layer (Fabric/Nylon Cord): Enhances pressure resistance and structural strength
Outer Rubber Layer: Provides aging resistance and protection against environmental factors
Flanges (Carbon Steel / Stainless Steel / Dacromet Coated): Ensure secure pipeline connection

The eccentric design shifts the centerline, which is especially useful in preventing air accumulation or sediment buildup, particularly in pump inlet applications.

2. Key Features and Advantages

1️⃣ Excellent Movement Compensation

Capable of absorbing:

Axial movement
Lateral displacement
Angular deflection

This helps protect pipelines and reduces stress concentration.

2️⃣ Superior Vibration and Noise Reduction

The natural elasticity of rubber effectively minimizes vibration and noise, extending the service life of connected equipment.

3️⃣ Ideal for Eccentric Connections

Perfect for systems where pipes of different diameters are not aligned on the same axis, especially at pump inlets.

4️⃣ Flexible Hand-Made Customization

Compared with molded products:

Suitable for non-standard sizes
Adaptable to complex working conditions
Economical for small batch production

3. Applications

Widely used in:

Water supply and drainage systems
HVAC systems
Chemical pipelines
Fire protection systems
Pump inlet and outlet connections
Marine piping systems

Especially effective in eccentric pump inlet installations, helping prevent cavitation and ensuring stable operation.

4. Selection Considerations

When selecting the product, consider:

Large-end and small-end diameters
Eccentric offset distance
Working pressure and temperature
Medium type (corrosive or not)
Flange standards (ANSI, DIN, JIS, etc.)

The standard technical parameters for our eccentric reducer hand-made rubber expansion joints are as follows:

DN (mm)	Inch	Standard Length (mm)	Producible Length (mm)	Axial Compression (mm)	Axial Extension (mm)	Lateral Movement (mm)	Angular Movement (°)	Standard Pressure (bar)	Max Pressure (bar)
50	2″	150	150-500	10	20	10	10	10	80
65	2½”	200	150-500	10	20	20	10	10	80
80	3″	200	150-500	10	20	20	10	10	80
100	4″	200	150-500	10	25	20	10	10	80
125	5″	200	150-500	10	25	20	10	10	50
150	6″	200	150-500	10	25	20	10	10	50
175	7″	200	150-500	15	25	20	10	10	50
200	8″	200	150-500	15	25	20	10	10	50
225	9″	200	200-500	15	25	20	10	10	50
250	10″	200	200-500	15	25	20	8	10	40
300	12″	200	200-500	15	25	20	8	10	40

If the required specifications differ from our standard, we can provide customization based on samples or drawings.

For inquiries, please contact:
Email: sales01@songjiangflex.com
Tel/WhatsApp: +86 13032112360

Our Commitment：
1、Raw Materials: Strict adherence to raw material standards.；
2、Production Process: Rigorous control of each production stage with full traceability.；
3、Testing Center: Regular testing of raw materials, rubber compounds, finished product performance, pressure, load-bearing capacity, and deflection.；
4、After-Sales Service:Commonly used products: 3-year warranty. Products with high-temperature, acid/alkali resistance, and oil resistance requirements: 2-year warranty.Custom products for special applications: 1-year warranty.For any quality issues, we will provide a written response within 12 hours and a resolution within 24 hours. If there is a quality problem, our factory will replace the product free of charge.；