Product Overview
Reliable custom rubber parts for industrial applications
Quick Answer
DN150 rubber flexible joint with blue flanges is a flexible pipe connector for vibration isolation, noise reduction and limited movement compensation in compatible piping systems. DN150 nominal size and blue flange appearance are confirmed. Rubber material, pressure rating, flange standard, bolt hole pattern, face-to-face length and reinforcement structure should be confirmed by drawing or project requirements.
The DN150 rubber flexible joint with blue flanges is a flanged pipe connector used for vibration isolation, noise reduction and limited movement compensation in compatible piping systems. The confirmed specifications are DN150 nominal size and blue flange appearance. Rubber material, pressure rating, flange standard, face-to-face length, bolt hole pattern and tolerance should be confirmed by drawing or project requirements.
DN150 Rubber Flexible Joint with Blue Flanges — Flanged Rubber Expansion Joint for Pipeline Vibration Isolation
Product Overview
The DN150 Rubber Flexible Joint with Blue Flanges is a flanged rubber expansion joint built with a flexible NBR or EPDM rubber body and carbon steel flanges finished in blue powder coating for corrosion protection and a distinctive visual appearance. This joint is designed to absorb vibration, noise, and thermal movement in pipeline systems, and is commonly supplied with a PN16 pressure rating at this nominal size. The blue flange finish is a common styling choice among manufacturers, both for corrosion resistance and for easy visual identification of the pressure class or product line on site.
Key Specifications
| Parameter | Typical Specification |
|---|---|
| Nominal Size | DN150 / 6 inch |
| Pressure Rating | PN16 (PN10 and PN25 also available depending on design) |
| Flange Material | Carbon steel with blue powder coating |
| Rubber Body Material | NBR or EPDM |
| Type | Single ball / single sphere flexible rubber joint |
| Overall Length | Typically 150–180 mm depending on manufacturer standard |
| Axial Extension | About 12 mm |
| Axial Compression | About 20 mm |
| Lateral Displacement | About 14 mm |
| Deflection Angle | Up to about 15° |
| Connection Type | Flanged |
What Is a DN150 Rubber Flexible Joint?
A DN150 rubber flexible joint is a flanged pipe connector used to absorb vibration, reduce noise, and compensate for thermal expansion or slight pipe misalignment. The flexible rubber body deforms under movement and pressure while the flanges maintain a secure, bolted connection to adjacent pipe sections, pumps, or valves. At DN150, this size is a common mid-range diameter used across water systems, HVAC, and general industrial piping.
Why Blue Flanges
Blue powder-coated flanges are used by several manufacturers for both functional and practical reasons:
- Corrosion protection for carbon steel flanges in humid or wet environments.
- A clean, consistent appearance that is easy to identify on a pipeline.
- Some manufacturers use color coating to help distinguish product series, pressure class, or brand identity.
- Powder coating provides a more durable finish than standard paint for long-term outdoor or industrial exposure.
Buyers should confirm the exact flange rating and drilling standard rather than relying on color alone, since coating color conventions can vary between suppliers.
Structure and Materials
A typical DN150 rubber flexible joint is built from several layers:
- Inner rubber layer in contact with the fluid.
- Reinforcement layer using nylon cord fabric or steel wire.
- Outer rubber layer for weather and mechanical protection.
- Steel wire ring or bead ring near the flange area for structural strength.
- Carbon steel flanges, often powder coated in blue or another protective finish.
After vulcanization, the rubber body is bonded to the metal flange or connection type specified for the project.
Movement Capability
At DN150, typical published movement values for this joint type include:
| Movement Type | Typical Value |
|---|---|
| Axial Extension | About 12 mm |
| Axial Compression | About 20 mm |
| Lateral Displacement | About 14 mm |
| Deflection Angle | Up to about 15° |
Actual movement capability can vary depending on the specific manufacturer, ball structure (single or twin sphere), and reinforcement design.
Material Selection Guide
| Material | Main Advantage | Typical Use |
|---|---|---|
| NBR | Good oil resistance | Oil-containing or general industrial fluids |
| EPDM | Strong water, heat, and weather resistance | Water supply, HVAC, warm water systems |
| CR / Neoprene | Moderate chemical and weather resistance | General industrial and outdoor use |
| FKM | Higher chemical and temperature resistance | More demanding chemical service |
NBR is a common choice for this configuration, while EPDM remains popular where water and heat resistance are the primary requirement.
Common Applications
- Pump suction and discharge connections.
- Water supply and distribution pipelines.
- HVAC and chilled or hot water circuits.
- General industrial piping systems.
- Systems requiring vibration isolation near rotating equipment.
The flanged design and blue-coated flanges make this joint suitable for both new installations and equipment replacement projects where a clean, corrosion-resistant appearance is preferred.
Engineering Benefits
- Reduces vibration transmitted from pumps and rotating equipment.
- Lowers pipeline noise levels.
- Compensates for thermal expansion and contraction.
- Tolerates minor installation misalignment.
- Protects flanges, valves, and pipe joints from mechanical stress.
- Provides a corrosion-resistant flange finish for improved service life.
Installation Notes
The joint should always be installed between two properly anchored points so that it can absorb movement as intended, rather than being forced to carry uncontrolled pipeline load. Flange bolts should be tightened evenly, and the joint should not be pre-stretched or compressed beyond its rated movement during installation. Confirm flange drilling pattern and pressure class compatibility with the connecting pipework before installation.
Custom Manufacturing Options
We can manufacture DN150 rubber flexible joints with custom specifications, including:
- NBR, EPDM, CR, or FKM rubber body options.
- Single sphere or twin sphere construction.
- Carbon steel flanges with blue, black, or custom powder coating.
- DIN, ANSI, JIS, GB, and other flange drilling standards.
- Custom overall length and pressure rating (PN10, PN16, PN25).
- OEM branding and private-label packaging.
Why Source from Julong Rubber?
- Experience manufacturing flanged rubber expansion joints.
- Multiple rubber compound options for water, oil, and industrial service.
- Custom flange coating options including blue powder coating.
- Support for OEM drawings and project-specific specifications.
- Low MOQ for replacement parts and project orders.
- Suitable for water, HVAC, and general industrial applications.
FAQ
What is a DN150 rubber flexible joint with blue flanges used for?
It is used in compatible piping systems to connect flanged pipe sections while helping reduce vibration, noise and limited movement. Typical installation locations include pump outlets, valve connections, HVAC water systems and industrial circulation lines where DN150 is the required nominal size.
Can the flange standard and bolt hole pattern be customized?
Yes. Flange standard, flange diameter, bolt hole quantity, bolt hole diameter and sealing face can be reviewed according to the drawing or project specification. Buyers should provide confirmed pipeline requirements before production to avoid installation mismatch.
How should buyers select the rubber material?
Rubber material selection depends on working media, temperature, pressure, outdoor exposure, ozone, oil, chemicals and service environment. Buyers should provide the exact media and operating conditions. Material selection depends on the application conditions and should be confirmed before production.
Are exact dimensions available for this DN150 flexible joint?
The confirmed information provided is DN150 nominal size and blue flanges. Other dimensions, including face-to-face length, flange diameter, bolt hole pattern, wall thickness and pressure rating, should be confirmed by drawing, project specification or physical sample.
Is tooling required for a custom rubber flexible joint?
Tooling may be required depending on the joint size, rubber body structure, flange connection and reinforcement design. Tooling cost depends on the drawing and product structure. Existing tooling or standard structures can be reviewed after receiving the required specifications.
Are samples available before bulk production?
Samples are available upon request. Sample preparation depends on confirmed dimensions, rubber material, pressure rating, structure, tooling status and inspection requirements. Please provide a drawing, project specification or physical sample for technical review.
Request a Custom Quote
Send your DN150 rubber flexible joint drawing, project specification or physical sample for review. Please include nominal size, pressure rating, face-to-face length, flange standard, bolt hole pattern, rubber material, media, temperature, working pressure, test pressure, quantity and documentation requirements.
