KWT 90° Rubber Elbow / 90-Degree Rubber Bend
1. 90-degree directional change with full flexibility.
2. Multi-directional displacement compensation (X, Y, Z).
3. Superior vibration and noise attenuation.
4. Molded vulcanized construction — seamless integrity.
5. Wide material compatibility: NR, EPDM, NBR, FKM.
6. Pressure ratings: PN10, PN16, PN25 (1.0-2.5 MPa).
7. Size range: DN32-DN300 (1¼”-12″).
8. Operating temperature: -30°C to +100°C.
KWT 90° Rubber Elbow / 90-Degree Rubber Bend
DEVEL KWT 90° Rubber Elbows are precision-molded flexible connectors engineered to facilitate 90-degree directional changes in piping systems while providing vibration isolation and displacement compensation.
Constructed with an inner rubber layer, reinforced fabric carcass, and outer rubber cover — all vulcanized into a seamless curved sphere with loose metal flanges — these elbows deliver exceptional pressure resistance and multi-directional flexibility.
Ideal for applications requiring both directional routing and dynamic movement accommodation, KWT elbows effectively reduce pipeline vibration, absorb thermal expansion, and compensate for installation misalignment in confined spaces.
Key Features at a Glance
- 90-Degree Directional Change with Full Flexibility
Engineered curved geometry enables smooth 90-degree pipeline routing while maintaining the full displacement compensation capabilities of standard straight rubber joints. Eliminates the need for multiple fittings and rigid elbow connections. - Multi-Directional Displacement Compensation
Absorbs axial, lateral, and angular movements simultaneously. Compensates for thermal expansion, equipment vibration, and installation misalignment — protecting connected equipment and extending system service life. - Superior Vibration and Noise Attenuation
High-elasticity rubber construction effectively isolates mechanical vibrations and fluid-borne noise. Significantly reduces structural transmission of pump and equipment vibrations to building infrastructure. - Molded Vulcanized Construction — Seamless Integrity
One-piece molded construction with integrated reinforcement layers ensures uniform wall thickness and eliminates weak points. Superior to fabricated or wrapped alternatives in pressure resistance and fatigue life. - Wide Material Compatibility for Diverse Media
Available in Natural Rubber (NR), EPDM, NBR, Neoprene (CR), and FKM to handle water, oil, acids, alkalis, seawater, compressed air, and natural gas across temperature ranges from -30°C to +100°C.
Key Features & Advantages
- Space-Efficient Installation: Compact 90-degree design reduces overall pipeline footprint compared to traditional rigid elbow + flexible joint combinations — ideal for constrained mechanical rooms and equipment pads.
- Reinforced Multi-Ply Construction: Nylon cord fabric reinforcement with multi-strand coppering steel wire rings provides exceptional pressure resistance and structural stability under dynamic loading conditions.
- Loose Flange Design: Rotatable flanges simplify bolt-hole alignment during installation. Compatible with GB, ANSI, DIN, and JIS flange standards for global project compatibility.
- Zero Maintenance Design: No moving parts, seals, or wear components. Service life exceeds 10 years in typical HVAC and industrial applications with no scheduled maintenance requirements.
- Corrosion-Resistant Materials: Carbon steel or stainless steel (201/304/316/321) flanges with optional plastic flanges (CPVC, PVDF, PPH, UPVC, RPP) for aggressive chemical environments.
General Parameters & Specifications
| Parameter | Specification |
|---|---|
| Product Name | KWT 90° Rubber Elbow / 90-Degree Rubber Bend |
| Nominal Diameter | DN32 – DN300 (1¼” – 12″) |
| Pressure Rating | PN10 (1.0 MPa) | PN16 (1.6 MPa) | PN25 (2.5 MPa) |
| Burst Pressure | 2.0 MPa (PN10) | 3.0 MPa (PN16) | 4.0 MPa (PN25) |
| Operating Temperature | -15°C to +70°C (Standard) | -30°C to +100°C (Special Compounds) |
| Vacuum Rating | 53.3 kPa (400 mmHg) to 100 kPa (750 mmHg) depending on pressure class |
| Elastomer Materials | Natural Rubber (NR), EPDM, NBR, Neoprene (CR), IIR, FKM, PTFE |
| Reinforcement | Nylon Cord Fabric + Multi-Strand Coppering Steel Wire Rings |
| Flange Materials | Carbon Steel (Q235) | Stainless Steel (201/304/316/321) | Plastic (CPVC/PVDF/PPH/UPVC/RPP) |
| Connection Standard | GB, ANSI, DIN, JIS — Custom drilling available |
Product Construction & Material Breakdown
Fig. 1 — KWT 90° Rubber Elbow Cross-Section Construction Diagram (Numbers correspond to Material Table below)
| Part No. | Component Name | Material Specification |
|---|---|---|
| 1 | Curved Rubber Body (Rubber Elbow Sphere) | Multi-layer composite construction: Inner Rubber Layer (media-contact) + Nylon Cord Fabric Reinforcement Layer + Outer Rubber Cover. Vulcanized as a seamless, single-piece curved sphere. |
| 2 | Inner Rubber Lining (Tube) | Natural Rubber (NR) — standard for water/air. EPDM for hot water, acids & alkalis. NBR for oils & hydrocarbons. Neoprene (CR) for seawater. FKM (Viton) for high-temperature chemical resistance. IIR for weather/ozone resistance. |
| 3 | Reinforcement Carcass | High-tenacity nylon cord fabric, cross-wrapped in multiple plies. Integrated multi-strand coppering steel wire rings for structural integrity and pressure containment. Arranged at optimized angles for balanced hoop and longitudinal strength. |
| 4 | Outer Rubber Cover | Weather-resistant and abrasion-resistant elastomer compound. Provides external mechanical protection, UV resistance, and environmental durability. Same material options as inner lining for full compatibility. |
| 5 | Loose Metal Backing Flanges (Rotatable) | Carbon Steel Q235 (galvanized or painted) — standard. Stainless Steel 201/304/316/321 — for corrosive environments. Optional plastic flanges: CPVC, PVDF, PPH, UPVC, RPP for aggressive chemical service. Rotatable design allows easy bolt-hole alignment during installation. |
Engineering Note: Component numbering corresponds to the construction diagram above. Material selection is application-dependent — consult DEVEL engineering team for guidance on elastomer compatibility with specific media, temperature ranges, and operating conditions.
Dimensional Specifications & Displacement Matrix
| DN (mm) | inch | Length (mm) | X (mm) | X’ (mm) | Y (mm) | Y’ (mm) | Z (mm) | Z’ (mm) |
|---|---|---|---|---|---|---|---|---|
| 50 | 2 | 140 | 20 | 16 | 20 | 16 | 16 | 16 |
| 65 | 2½ | 140 | 20 | 16 | 20 | 16 | 16 | 16 |
| 80 | 3 | 150 | 20 | 16 | 20 | 16 | 16 | 16 |
| 100 | 4 | 160 | 20 | 16 | 20 | 16 | 16 | 16 |
| 125 | 5 | 180 | 20 | 16 | 20 | 16 | 16 | 16 |
| 150 | 6 | 200 | 20 | 16 | 20 | 16 | 16 | 16 |
| 200 | 8 | 230 | 20 | 16 | 20 | 16 | 16 | 16 |
| 250 | 10 | 280 | 20 | 16 | 20 | 16 | 16 | 16 |
| 300 | 12 | 330 | 20 | 16 | 20 | 16 | 16 | 16 |
Engineering Note: Displacement values shown are for standard KWT-1 (PN10) configuration. Higher pressure classes may have slightly reduced displacement capacity. Custom lengths and displacement specifications available upon request.
Typical Applications
- HVAC Systems: Chilled water and hot water distribution in commercial buildings, hospitals, and data centers where space constraints require compact 90-degree routing with vibration isolation.
- Pump Connections: Suction and discharge connections for centrifugal pumps, providing both directional change and vibration dampening to protect building structure and adjacent equipment.
- Power Generation: Cooling water circuits, auxiliary systems, and condensate lines in thermal and nuclear power plants requiring reliable flexible connections.
- Marine & Shipbuilding: Ballast systems, cooling circuits, and bilge lines aboard commercial vessels where space efficiency and vibration control are critical.
- Water Treatment: Filter backwash lines, chemical dosing systems, and process piping in municipal and industrial water treatment facilities.
- Industrial Process: Chemical plants, paper mills, and manufacturing facilities requiring corrosion-resistant flexible connections for process fluids.
Product Tags
Rubber Bend
KWT Series
Flexible Elbow
Vibration Isolation
DN32-DN300
PN10/PN16/PN25
HVAC
Pump Connection
EPDM/NBR
Natural Rubber
Molded Construction
Loose Flange
Water Treatment
Marine Application
Request a Custom Quote for Your Project
Factory-direct pricing available. DEVEL engineering team ready to assist with material selection, sizing calculations, and installation guidance.
