Clamp Type Rubber Expansion Joint
1. Bolt-free stainless steel clamp installation — no flange bolts, no gaskets, no torque wrenches required.
2. Compact, lightweight design for tight spaces and retrofit of existing rigid pipelines.
3. Zero thrust reaction — compensates axial/lateral movement without transferring forces to pipe anchors.
4. Compatible with multiple pipe materials: steel, PVC/CPVC, FRP, and ductile iron.
5. Bore range DN25–DN1000 for low-pressure fluid handling up to 0.4 MPa (PN4).
6. Available in EPDM and NBR with optional SS304 or SS316 clamp bands.
7. Slip-on coupling reduces installation time by up to 70% compared to traditional flanged joints.
8. Ideal for pump suction/discharge, industrial drainage, HVAC risers, and fire protection piping.
Clamp Type Rubber Expansion Joint
Key Features at a Glance
- Bolt-Free Installation. Eliminates conventional backing flanges, gaskets, and heavy fastener sets entirely — the high-flexibility rubber body is secured directly with heavy-duty Stainless Steel 304/316 clamps (Worm Gear or Heavy T-Bolt design). This reduces assembly time by up to 70% compared to traditional flanged joints, making it ideal for confined spaces, retrofit projects, and weight-sensitive applications where every kilogram matters.
- Space-Saving Compact Geometry. The clamp-on profile requires zero additional flange face-to-face length beyond the rubber bellows itself (as low as 150mm for DN25–DN100). This slim form factor delivers critical advantages in pump inlet installations, HVAC mechanical rooms, shipboard piping systems, and modular skid-mounted equipment where conventional flanged expansion joints simply cannot fit within the available envelope.
- Negligible Reactive Counter-Thrust Force. Unlike pressurized metal expansion joints that generate significant thrust loads requiring costly external restraint systems (tie rods, limit rods, anchor blocks), the elastomeric body of a clamp-type joint absorbs high-frequency equipment vibration and acoustics through structural elasticity without transmitting severe reactionary stress loads back to pump heads or valve bodies — protecting sensitive rotating equipment from premature bearing wear.
- Multi-Material Pipe Adaptability. Engineered to provide comprehensive sealing performance across diverse non-metallic and metallic piping substrates including HDPE, PVC, Cast Iron, Carbon Steel, Hot-Dip Galvanized Conduits, and even concrete-encased ducts. A single clamp-type SKU can replace multiple flanged variants, dramatically reducing inventory complexity for contractors managing mixed-material utility networks.
- Superior Cost Efficiency & Lightweight Design. By removing steel flanges, bolts, nuts, and gaskets from the bill of materials, clamp-type joints deliver 40–60% lower installed cost versus equivalent flanged rubber expansion joints. The weight reduction (typically 2–5 kg per unit depending on DN) also reduces shipping costs, simplifies manual handling during installation, and lowers structural support requirements on suspended piping runs in commercial buildings.
Key Structural & Operational Features
- Weight-Optimized Boltless Geometry: Eliminates conventional backing flanges and heavy fasteners, making it highly suitable for spatial-restricted areas and weight-sensitive modern pipeline layouts such as marine vessels, offshore platforms, and prefabricated modular buildings.
- Negligible Reactive Counter-Thrust Force: Structural elasticity absorbs high-frequency equipment vibration and acoustic energy without transmitting severe reactionary stress load back to pump headers or valve bodies — extending service life of connected machinery by 25–40%.
- Multi-Material Pipe Adaptability: Engineered to provide comprehensive sealing performance across diverse piping substrates, including HDPE, PVC, Cast Iron, Carbon Steel, and Hot-Dip Galvanized Conduits — one product family serves multiple pipe material types.
- Reliable Sealing Integrity: Precision-molded elastomeric sealing face achieves uniform compression contact with the pipe outer diameter (OD) under heavy SS304 clamping tension, actively preventing process fluid leakage even under cyclic pressure pulsation conditions.
Technical Properties & Operating Limits
| Technical Parameter | Engineering Specification |
|---|---|
| Product Identification | Clamp-Type Rubber Expansion Joint (Slip-on Flexible Bellows Coupling) |
| Clamping Mechanism Material | Heavy-duty Stainless Steel 304 / SS316 (Worm Gear or Heavy T-Bolt design) |
| Maximum Working Pressure | PN ≤ 0.4 MPa (Low to Medium Pressure Applications) |
| Elastomeric Compound Matrix | NR (Natural Rubber), EPDM, High-Temperature Silicone, NBR (Nitrile), Neoprene |
| Target Engineering Environment | Commercial Construction, HVAC, Water Treatment Utilities, Industrial Fire Protection, Power Distribution |
Dimensional Matrices & Movement Capabilities
| Nominal Diameter (DN – mm) | Face-to-Face Length (L – mm) | Axial Extension (mm) | Axial Compression (mm) | Lateral Movement (mm) |
|---|---|---|---|---|
| DN25 – DN50 | 150 | 7 | 10 | 10 |
| DN65 – DN100 | 150 | 10 | 15 | 12 |
| DN125 – DN200 | 180 | 12 | 20 | 14 |
| DN250 – DN400 | 200 | 15 | 25 | 22 |
| DN450 – DN600 | 250 | 20 | 30 | 25 |
| DN700 – DN1000: Fully Customized Based on Engineering Blueprints & Working Environment Tolerance | ||||
Critical Field Installation Directives
- Tolerance Evaluation: Before locking parameters, verify that the raw outer diameter (OD) of the mating pipe perfectly aligns with the exact internal dimensions of the DEVEL flexible coupling. OD deviation exceeding ±2% may result in inadequate clamping seal or over-compression damage to the rubber matrix.
- Torque Calibration: Smoothly slide the elastomeric bellows sleeve over the pipe interface, then tighten the high-strength SS304 clamping bands evenly (star-pattern sequence) to achieve an absolute compression leak-proof seal without cutting or damaging the rubber matrix. Recommended torque range: 15–45 Nm depending on DN size.
- Operational Modification: For non-standard installation face-to-face gaps, continuous thermal stress, or specialized media handling (high concentration acid/alkali/high temperature), specific inner liner upgrades must be finalized during the ordering phase to ensure long-term chemical compatibility and thermal stability.
Typical Applications
Low-Pressure Civil Piping
Municipal water supply networks, residential drainage systems, irrigation channels, and stormwater management infrastructure where bolt-free installation accelerates project timelines.
Water Pump Inlets
Centrifugal pump suction lines, booster station intakes, and fire pump assemblies where vibration isolation protects impeller bearings and eliminates cavitation-induced resonance.
Industrial Drainage Systems
Factory floor effluent collection, cooling tower blowdown lines, and process condensate return piping where chemical resistance and rapid replacement capability are essential for uptime maintenance.
HVAC & Building Services
Chilled water loops, heating system distribution, air handling unit connections, and ceiling-suspended ductwork where space constraints and weight limits make clamp-type connectors the optimal choice.
Product Tags
Slip-on Flexible Coupling
Rubber Bellows
Bolt-Free Connector
SS304 Clamping
Vibration Isolation
EPDM Rubber Joint
NBR Rubber Joint
Industrial Piping
HVAC Systems
Water Treatment
Pump Inlet
Fire Protection
Lightweight Connector
DN25-DN1000
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Factory-direct pricing available. DEVEL engineering team ready to assist with material selection, sizing calculations, and installation guidance.
