PPH Eccentric Reducer Coupler
A PPH Eccentric Reducer Coupler is a type of pipe fitting made from Polypropylene Homopolymer (PPH) that is used to connect two pipes of different diameters while maintaining either the top or bottom level of the pipeline.It features an offset (eccentric) design, meaning the centerlines of the two connected pipes are not aligned, which helps in maintaining a smooth flow path and prevents operational issues. A PPH Eccentric Reducer Coupler is a piping fitting that joins pipes of different sizes with an offset design to maintain flow efficiency and avoid air or fluid trapping in the system.
The PPH Eccentric Reducer Coupler is a specialized pipe fitting designed to connect two pipes of different diameters in a way that maintains a consistent bottom or top level, depending on installation orientation. Made from Polypropylene Homopolymer (PPH), this reducer coupler is highly resistant to chemical corrosion, making it ideal for use in industrial and chemical fluid handling systems. The eccentric design is particularly effective in preventing air pockets or fluid pooling in horizontal pipelines, which helps maintain system efficiency and minimizes the risk of blockages or contamination in gravity-fed or process-critical applications.
- Chemical Resistance
- Low Maintenance Requirement
- Low Thermal Conductivity
- Long Service Life
- Easy Installation
- Corrosion Resistance
PPH Eccentric Reducer Coupler Details
OD₁ – Outer Diameter of Larger End
OD₂ – Outer Diameter of Smaller End
ID₁ – Inner Diameter of Larger End
L – Length of the Reducer
H – Height (or Body Height)
| Size (NB) | OD₁ (mm) | OD₂ (mm) | ID₁ (mm) | L (mm) | H (mm) |
| 1¼″ × 1″ | 42.16 | 33.40 | 35.0 | 90 | 13 |
| 1½″ × 1¼″ | 48.26 | 42.16 | 40.9 | 95 | 14 |
| 2″ × 1½″ | 60.33 | 48.26 | 52.5 | 100 | 16 |
| 2½″ × 2″ | 73.03 | 60.33 | 64.1 | 110 | 18 |
| 3″ × 2½″ | 88.90 | 73.03 | 77.9 | 120 | 20 |
| 4″ × 3″ | 114.30 | 88.90 | 100.8 | 140 | 24 |
| 6″ × 4″ | 168.28 | 114.30 | 152.2 | 160 | 30 |
| 8″ × 6″ | 219.08 | 168.28 | 202.7 | 180 | 35 |
| 10″ × 8″ | 273.05 | 219.08 | 254.5 | 200 | 42 |
| Parameter | Specification / Details |
| Product Name | PPH Eccentric Reducer Coupler |
| Material | Polypropylene Homopolymer (PPH) |
| Type | Eccentric Reducer Coupler (Offset design) |
| Design Feature | Offset centerline (Flat top or bottom) |
| Function | Connects pipes of different diameters while maintaining level alignment |
| Manufacturing Process | Injection molded / Butt fusion fabricated |
| Size Range | DN25 × DN20 to DN300 × DN200 (Custom sizes available) |
| Outer Diameter Range | 20 mm to 315 mm (Typical) |
| Connection Type | Socket fusion / Butt fusion |
| Pressure Rating | Up to PN10 (~10 bar, varies by size) |
| Temperature Range | 0°C to +100°C |
| Density | ~0.90–0.91 g/cm³ |
| Tensile Strength | ~20–30 MPa (Approx.) |
| Surface Finish | Smooth internal bore (Low friction loss) |
| Color | Grey / Natural / Black |
| Standards | ISO 15494, DIN 8077/8078, EN ISO 161 |
| Chemical Resistance | Excellent (Acids, alkalis & corrosive fluids) |
| Corrosion Resistance | 100% corrosion-free |
| UV Resistance | Moderate (Can be enhanced with additives) |
| Installation Method | Fusion welding (Butt/Socket) |
| Applications | Chemical processing, water treatment, effluent systems |
Offset Centerline Design – Maintains a flat flow line for horizontal installation.
Excellent Chemical Resistance – Suitable for a wide range of acids, alkalis, and corrosive fluids.
Corrosion-Free & Durable – Withstands aggressive environments without degradation.
Minimized Flow Disruption – Reduces turbulence and prevents air accumulation.
Smooth Internal Surface – Promotes steady flow and reduces pressure losses.
Fusion-Weld Compatible – Designed for both butt fusion and socket fusion techniques.
Lightweight Construction – Easy to install and transport.
| PN Class | Maximum Working Pressure (bar) | Maximum Pressure (MPa) | Typical Application |
| PN 6 | 6 bar | 0.6 MPa | Low-pressure drainage & gravity flow systems |
| PN 10 | 10 bar | 1.0 MPa | Standard industrial & chemical pipelines |
| PN 12.5 | 12.5 bar | 1.25 MPa | Medium-pressure chemical systems |
| PN 16 | 16 bar | 1.6 MPa | High-pressure industrial applications |
Custom Product Manufacturing Available
If you are searching for customized product designs that meet your requirements, don’t worry. Petron Thermoplast also offers custom product manufacturing services to meet the unique needs of various industries. Work with our expert engineers to create custom designs suited for your application.
Benefits of Using PPH Eccentric Reducer Coupler
1. Prevents Air Lock & Fluid Accumulation
- The eccentric (offset) design keeps one side of the pipe level.
- Prevents formation of air pockets or gas accumulation in pipelines.
- Ensures smooth and continuous fluid flow, especially in horizontal pipelines.
2. Improves Flow Efficiency
- Provides a gradual and smooth transition between different pipe diameters.
- Minimizes turbulence and pressure loss in the system.
- Enhances overall system performance and efficiency.
3. Ideal for Pump Suction Applications
- Eliminates cavitation risks by avoiding air entrapment.
- Ensures proper liquid flow into pumps, protecting equipment from damage.
4. Excellent Chemical Resistance
- Made from PPH material, which is highly resistant to:
- Acids
- Alkalis
- Corrosive chemicals
- Suitable for chemical processing and industrial fluid handling.
5. Prevents Solid Settling & Blockages
- When installed correctly (flat-bottom), it avoids dead zones.
- Reduces accumulation of solids, sludge, or debris in pipelines.
6. Lightweight & Easy Installation
- PPH material is lightweight compared to metal fittings.
- Easier to handle, transport, and install, reducing labor costs.
7. Maintains Pipeline Alignment
- Keeps either the top or bottom of the pipeline level.
- Useful in pipe racks and drainage systems to maintain consistent elevation.
8. Durable & Long Service Life
- High mechanical strength and resistance to wear.
- Long-lasting performance even in harsh environments.
9. Reduces Noise & Vibration
- Smooth flow transition reduces turbulence-related vibration.
- Helps in quieter pipeline operation.
10. Versatile Industrial Applications
- Suitable for:
- Chemical industries
- Water treatment plants
- Pharmaceutical systems
- Effluent & slurry handling
Types of PPH Eccentric Reducer Coupler
Top Flat (TF) Type
- Flat side is on the top.
- Used in pump suction lines.
- Prevents air or vapor accumulation in the pipeline.
Bottom Flat (BF) Type
- Flat side is on the bottom.
- Used in pipe racks or drainage systems.
- Maintains constant bottom elevation of the pipeline.
Socket Fusion Type
- Joined by socket welding (fusion).
- Common in small to medium pipe sizes.
- Provides leak-proof and strong joints.
Butt Fusion Type
- Joined by butt welding method.
- Suitable for larger diameter pipes.
- Ensures uniform strength across the joint.
Standard Size Reducers
- Predefined sizes (e.g., DN50 × DN32, DN100 × DN80).
- Widely used in general industrial piping.
Custom Size Reducers
- Manufactured as per project requirements.
- Used in specialized industrial systems.
Pump Suction Type
- Optimized for pump inlet systems.
- Reduces cavitation risk and improves efficiency.
Slurry / Solid Handling Type
- Designed to minimize solid deposition and clogging.
Standard Pressure Type
- Used in normal industrial systems (e.g., water, chemicals).
Horizontal Line Type
- Specifically designed for horizontal pipelines.
- Prevents air pockets and fluid stagnation.
Heavy-Duty / High-Pressure Type
- Used in high-pressure or aggressive chemical applications.
Applications of PPH Eccentric Reducer Coupler
Process Industry
High Purity Applications
Electronic Industry
Electrical Industry
Semi-conductors Industry
Pharmaceutical Industry
Solar power panels
Sugar Industry
Paper & Pulp Industry
Nuclear Power Industry
Automotive Industry
DI water plants
Why Choose Petron Thermoplast?
Petron Thermoplast PPH Backing Ring are efficient, reliable, and essential tools in industrial automation, offering precise control of flow, pressure, and temperature. Proper selection, correct installation, and regular maintenance to ensure that these rings perform optimally in practical applications. As industrial automation technology continues to advance, the PPH Backing Ring will see broader applications and improved performance, providing a reliable foundation for safe, efficient, and stable production.
