Product Overview
Reliable custom rubber parts for industrial applications
Quick Answer
Rubber flexible joint PN25 200mm is a flexible pipe connector for vibration isolation, noise reduction and limited movement compensation in compatible piping systems. The confirmed specifications are PN25 pressure rating and 200mm nominal size. Rubber material, flange standard, bolt hole pattern, face-to-face length, reinforcement structure and documentation should be confirmed by drawing or project requirements.
The rubber flexible joint PN25 200mm is a flexible pipe connection component used to absorb vibration, reduce noise and compensate limited movement in compatible piping systems. The provided specifications are PN25 pressure rating and 200mm nominal size. Material, flange connection, reinforcement structure, temperature range, media compatibility and dimensional details should be confirmed by drawing or project requirements.
Rubber Flexible Joint PN25 200mm — Flanged Rubber Expansion Joint for Pipeline Vibration Isolation
Product Overview
The Rubber Flexible Joint PN25 200mm is a DN200 flanged rubber expansion joint designed to absorb vibration, reduce noise, and compensate for axial, lateral, and angular movement in pipeline systems. This size is commonly used in water supply, HVAC, pump discharge, chemical transfer, and industrial piping where equipment vibration and thermal movement can damage rigid pipe connections. With a PN25 pressure class, the joint is rated for 25 bar service and is typically built with a rubber body, textile reinforcement, steel wire or bead ring reinforcement, and metal flanges.
Key Specifications
| Parameter | Typical Specification |
|---|---|
| Nominal Size | 200 mm / 8 inch |
| Pressure Rating | PN25 / 25 bar |
| Type | Flanged rubber flexible joint / rubber expansion joint |
| Common Rubber Materials | EPDM, NBR, NR, CR, IIR, FKM, PTFE-lined options |
| Reinforcement | Nylon cord fabric, steel wire, bead ring |
| Connection | Flanged |
| Typical Face-to-Face Length | 150 mm or 210 mm depending on design standard |
| Typical Movement at DN200 | Extension 10–16 mm, compression 16–25 mm, lateral 13–22 mm, angular 10°–15° |
| Typical Media | Water, warm water, seawater, air, oil, slurry, weak acids, alkalis |
| Typical Temperature Range | About -15°C to 115°C standard, higher with special compounds |
What Is a PN25 200mm Rubber Flexible Joint?
A PN25 200mm rubber flexible joint is a flexible pipe connector installed between flanged pipe sections, pumps, or valves to absorb mechanical stress and movement. The rubber body deforms under vibration, thermal expansion, and alignment offset, which helps protect piping systems from cracking, noise transfer, flange stress, and premature equipment wear. In DN200 size, it is often selected for medium-to-large industrial lines where both movement capacity and higher pressure resistance are required.
Structure and Materials
This type of joint is typically made from multiple functional layers:
- Inner rubber layer for media compatibility.
- Fabric reinforcement layer, often using multiple nylon cord plies.
- Middle rubber layer for structural support.
- Outer rubber layer for weather and environmental resistance.
- Reinforced metal ring or steel bead ring near the ends.
- Flanged connection for secure installation in pressurized systems.
For PN25 versions, carbon steel flanges are commonly used in the relevant size range, with PN25 availability specifically noted for metal flange constructions in mid-to-large DN ranges including DN200.
Why Choose DN200 PN25
DN200 is a widely used nominal diameter for process water, HVAC, municipal, and industrial pump lines. Choosing PN25 instead of a lower pressure class gives the joint a higher working pressure capability, which is important in systems with pressure fluctuation, surge, or more demanding pump duty. This makes the product suitable for more robust applications than standard PN10 or PN16 designs.
Movement Capability
Movement compensation is one of the core reasons to use a rubber flexible joint. For DN200 models, typical movement ranges include:
- Axial extension: 10–16 mm.
- Axial compression: 16–25 mm.
- Lateral displacement: 13–22 mm.
- Angular deflection: 10°–15°.
Actual allowable movement depends on whether the joint is single sphere, twin sphere, filled arch, or special reinforced construction.
Material Selection Guide
| Material | Main Advantage | Typical Use |
|---|---|---|
| EPDM | Water, heat, weather, and aging resistance | Water supply, HVAC, warm water |
| NBR | Oil resistance | Oil-containing lines, industrial fluids |
| NR | Good elasticity | General-purpose vibration absorption |
| CR / Neoprene | Weather and moderate chemical resistance | Outdoor and general industrial service |
| FKM | Higher chemical and temperature resistance | Demanding chemical service |
| PTFE-lined | Broad chemical compatibility | Corrosive process media |
For water and HVAC systems, EPDM is one of the most common material choices because of its good resistance to heat, water, and aging.
Common Applications
The PN25 DN200 rubber flexible joint is commonly used in:
- Pump suction and discharge lines.
- Water supply and drainage systems.
- HVAC and chilled water piping.
- Chemical and industrial process pipelines.
- Seawater and utility service lines.
- Air and compressed air pipe systems.
Its main value in these systems is to isolate vibration, reduce transmitted stress, and accommodate thermal movement or slight misalignment.
Engineering Benefits
- Reduces pump and pipeline vibration.
- Lowers system noise.
- Compensates for thermal expansion and contraction.
- Tolerates installation offset and alignment error.
- Protects pumps, valves, and flanges from mechanical stress.
- Supports a range of media through material selection.
Installation Notes
For best performance, the joint should be installed in the correct neutral position and not overextended during assembly. Pipe supports and anchors should be designed correctly so the joint absorbs movement as intended rather than carrying uncontrolled pipeline loads. Material selection should also match the system’s pressure, temperature, and media to avoid premature failure.
Custom Manufacturing Options
We can manufacture PN25 200mm rubber flexible joints with custom specifications, including:
- EPDM, NBR, CR, NR, FKM, or PTFE-lined body options.
- Single sphere or twin sphere construction.
- Carbon steel, galvanized steel, stainless steel, or ductile iron flanges.
- DIN, ANSI, JIS, and other flange drilling standards.
- Custom face-to-face length.
- Reinforced structure for higher vacuum or pressure requirements.
- OEM branding and private-label packaging.
Why Source from Julong Rubber?
- Experience in molded rubber pipeline connectors.
- Multiple rubber compound options for water, oil, HVAC, and industrial service.
- Stable dimensional control for flange connection products.
- Support for OEM drawings and special specifications.
- Low MOQ for replacement or project orders.
- Suitable for industrial, municipal, and pump-system applications.
FAQ
What is a rubber flexible joint PN25 200mm used for?
A rubber flexible joint PN25 200mm is used in compatible piping systems to reduce vibration, absorb noise and compensate limited movement between pumps, valves, equipment and pipelines. The 200mm nominal size and PN25 pressure rating should be matched to the pipeline design.
Can the flange dimensions be customized?
Yes. Flange dimensions, bolt hole quantity, bolt hole diameter, sealing face and face-to-face length can be reviewed according to the drawing or required flange standard. Buyers should provide confirmed pipeline specifications 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 PN25 200mm joint?
The confirmed information provided is PN25 and 200mm nominal size. Other dimensions, including flange diameter, bolt hole pattern, face-to-face length and wall thickness, should be confirmed by drawing, project specification or physical sample before quotation and production.
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 the 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 rubber flexible joint PN25 200mm drawing, project specification or physical sample for review. Please include nominal size, PN rating, face-to-face length, flange standard, bolt hole pattern, rubber material, media, temperature, working pressure, test pressure, quantity and documentation requirements.
