Expansion Joint Accessories
Expansion Joint accessories play a critical role in enhancing performance, protecting components, and ensuring reliable operation under various service conditions
| Accessory | Function / Purpose |
|---|---|
| Control Rods | Regulate lateral movement while permitting axial movement; do not restrain pressure thrust. |
| Limit Rods | Restrict maximum axial movement during abnormal conditions without restraining pressure thrust. |
| Tie Rods | Restrain pressure thrust and allow lateral movement; used in universal/lateral joints. |
| Panto-graphic Linkage | Ensures equal movement of multi-bellows units and prevents over-extension or uneven compression. |
| Internal Sleeve (Flow Liner) | Protects bellows from high-velocity flow, abrasion, turbulence, and reduces flow-induced vibration. |
| Purge Ports / Purge Connection | Allow purge gas injection to prevent particulate buildup or corrosion in convolutions. |
| External Shroud / Cover | Shields bellows from external damage, weather, debris, and accidental impact. |
| Shipping Brackets | Secure the expansion joint during transport and installation, preventing movement or damage. |
| Hinges / Hinged Plates | Permit angular rotation in one plane while fully restraining pressure thrust. |
| Gimbal Assemblies / Gimbal Rings | Allow angular movement in multiple planes and restrain pressure thrust. |
| Bellows Guard Rings | Provide external protection from mechanical damage in industrial environments. |
| Insulation Blankets / Pillows | Provide thermal insulation, reduce heat loss, and protect bellows from overheating. |
| Drain Ports / Drains | Remove condensate or trapped liquid to avoid corrosion or hydraulic locking. |
| Multi-Piece Liners | Allow liner installation in restricted spaces or after welding. |
| Support Bases / Feet | Support the expansion joint’s weight in large-diameter applications. |
| Pins, Bushings & Hardware Kits | Provide durable connections for panto-graphs, hinges, and rods. |
| Flow Direction Arrows / Nameplates | Ensure correct installation and maintain traceability per EJMA/ASME standards. |