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Large-flange rubber expansion joints are an improved version of ordinary rubber expansion joints designed to prevent pull-out. The core features are an extra-large flange at both ends of the rubber sphere (fully covering the flange face) + a metal slip-on flange. They offer strong high-pressure sealing, pull-out resistance, and excellent vibration damping, making them the preferred flexible expansion joint for pump rooms, high-pressure pipelines, and large-diameter pipe networks.
1. Rubber Sphere: Inner rubber (media resistant) + multi-layer polyester cord/steel wire reinforcement layer (pressure bearing) + outer rubber (aging resistant); Material: Natural rubber NR, EPDM, Nitrile rubber NBR, Neoprene rubber CR.
2. Large Flange: Both ends of the sphere are 90° outward-flangeed, fully covering the flange face, matching the flange outer diameter, and equipped with bolt holes.
3. Metal Slip-on Flange: Carbon steel/stainless steel, fitted onto the outside of the flange, bolted for fastening.
4. Limiting Tie Rod (Optional): For high-pressure/large-diameter applications, preventing excessive stretching and pull-out.
Multi-directional Displacement Compensation: The elastic deformation of the sphere absorbs axial (±20–50mm), lateral, and angular displacements, solving problems related to thermal expansion and contraction and foundation settlement.
Full-coverage Sealing: The flange 100% covers the flange sealing surface, and the bolts are tightened evenly, preventing leakage and eliminating the risk of "necking" under high pressure.
Vibration Reduction and Noise Reduction: The high elasticity of the rubber isolates the vibration of the water pump/equipment, reducing noise by 20–30dB and protecting the pipeline network and equipment.
Anti-pull-out: The flange and flange are locked together, preventing detachment under high pressure (PN16–PN25), and the tensile strength is 40%+ higher than that of ordinary expansion joints.
1. Enhanced Sealing: Fully enclosed flange, large sealing area, uniform stress, zero leakage, suitable for PN16–PN25 high pressure.
2. Anti-Pull-Out: Flanged flange + interlocking flange prevents detachment under high pressure, eliminating the "burst" hazard of ordinary expansion joints.
3. Large Compensation: Axial compensation 20–50mm, deflection angle ≤15°, suitable for complex displacements.
4. Easy Installation: Rotatable loose flange, no welding required, easy to align holes, quick assembly and disassembly.
1. Pump Rooms/Pump Stations: Pump inlet and outlet (vibration prevention, anti-pull-out, noise reduction).
2. High-Pressure Pipelines: Municipal water supply, long-distance water transmission, chemical/oil high-pressure pipelines.
3. Large-Diameter Pipelines: Main pipelines above DN200, high-rise water supply (with fixed brackets).
4. Vibration/Settlement Scenarios: Compressor and fan outlets; building settlement joints, pipelines crossing roads.
5. Wastewater treatment/seawater: EPDM/chloroprene rubber is compatible with acids, alkalis, and seawater corrosion.
| Nominal diameter DN | Length L | Axial displacement mm | Radial displacement mm | Offset displacement mm | ||||||
| mm | inch | Type A | Type B | Type A | Type B | Type A | Type B | |||
| elongation | compression | elongation | compression | |||||||
| 32 | 1¼ | 95 | 6 | 10 | 9 | ±7.5° | ||||
| 40 | 1½ | 95 | 7 | 10 | 9 | ±7.5° | ||||
| 50 | 2 | 105 | 7 | 10 | 10 | ±7.5° | ||||
| 65 | 2½ | 115 | 7 | 13 | 11 | ±7.5° | ||||
| 80 | 3 | 135 | 8 | 15 | 12 | ±7.5° | ||||
| 100 | 4 | 150 | 10 | 19 | 13 | ±7.5° | ||||
| 125 | 5 | 165 | 12 | 19 | 13 | ±7.5° | ||||
| 150 | 6 | 180 | 12 | 20 | 14 | ±7.5° | ||||
| 200 | 8 | 210 | 16 | 25 | 30 | 35 | 22 | 25 | ±7.5° | ±10° |
| 250 | 10 | 230 | 16 | 25 | 30 | 40 | 22 | 25 | ±7.5° | ±12° |
| 300 | 12 | 245 | 16 | 25 | 30 | 40 | 22 | 25 | ±7.5° | ±12° |
| 350 | 14 | 255 | 16 | 25 | 35 | 45 | 22 | 30 | ±7.5° | ±12° |
| 400 | 16 | 255 | 16 | 25 | 35 | 45 | 22 | 30 | ±7.5° | ±12° |
| 450 | 18 | 255 | 16 | 25 | 36 | 47 | 22 | 30 | ±7.5° | ±12° |
| 500 | 20 | 255 | 16 | 25 | 36 | 48 | 22 | 30 | ±7.5° | ±12° |
| 600 | 24 | 260 | 16 | 25 | 40 | 50 | 22 | 33 | ±7.5° | ±12° |
| 700 | 28 | 260 | 16 | 25 | 40 | 55 | 22 | 33 | ±7.5° | ±12° |
| 750 | 30 | 260 | 40 | 55 | 33 | ±7.5° | ±12° | |||
| 800 | 32 | 260 | 16 | 25 | 45 | 55 | 22 | 35 | ±7.5° | ±12° |
| 900 | 36 | 260 | 16 | 25 | 45 | 55 | 22 | 35 | ±7.5° | ±12° |
| 1000 | 40 | 260 | 16 | 45 | 60 | 22 | 35 | ±7.5° | ±12° | |
| 1100 | 44 | 300 | 45 | 60 | 35 | ±7.5° | ±12° | |||
| 1200 | 48 | 300 | 16 | 25 | 50 | 60 | 24 | 38 | ±7.5° | ±10° |
| 1300 | 52 | 300 | 50 | 60 | 38 | ±7.5° | ±10° | |||
| 1400 | 56 | 350 | 18 | 25 | 50 | 70 | 24 | 40 | ±7.5° | ±10° |
| 1500 | 60 | 350 | 60 | 70 | 40 | ±7.5° | ±10° | |||
| 1600 | 64 | 350 | 18 | 25 | 60 | 70 | 24 | 46 | ±7.5° | ±10° |
| 1800 | 72 | 400 | 18 | 25 | 60 | 75 | 24 | 48 | ±7.5° | ±10° |
| 2000 | 80 | 450 | 18 | 25 | 70 | 75 | 25 | 50 | ±7.5° | ±10° |
| 2200 | 88 | 500 | 18 | 25 | 70 | 80 | 25 | 60 | ±7.5° | ±10° |
| 2400 | 96 | 500 | 18 | 25 | 80 | 80 | 25 | 60 | ±7.5° | ±10° |
