Product Overview
The eccentric rubber expansion joint is a flexible connector widely used in pipelines. It helps compensate for pipe misalignment, axial displacement, and eccentricity. Common applications include:
Civil water supply and drainage systems
Firefighting pump rooms
Sewage treatment pipelines
High-pressure gas and chemical pipelines
Petroleum and shipbuilding industries
To ensure long service life and reliable performance, the following points must be considered during installation.
1. Keep Natural State During Installation
The joint must remain in its natural form without forced deformation during installation. Artificial distortion may cause early damage and reduce service performance.
2. Provide Adequate Pipe Support
When installed near pump outlets, elbows, or in suspended high-rise pipelines, proper pipe supports or hangers are required. Their strength must exceed the axial force. If this cannot be guaranteed, anti-pull limit devices should be installed.
3. Ensure Reinforced Rings Fit Properly
During installation, the reinforcement rings at both ends of the joint must be fully seated in the flange grooves. This prevents the joint from pulling out under internal pressure. Bolts should be tightened symmetrically (4 or 6 at a time) to ensure proper alignment.
4. Correct Bolt Installation
When connecting with pipeline flanges, the bolt threads should face the pipe flange side to avoid damaging the raised rubber arch during pressurization. Bolts must be tightened evenly and symmetrically. For harsh operating conditions, spring washers and flat washers should be added to prevent loosening.
5. Use Limit Devices in Frequent Operation
If the joint is installed near pump outlets or under frequent start-stop conditions, limit devices should be added on both flanges. This reduces excessive tension and compression, protecting both the joint and the pump.
6. Installation of Large-Diameter Joints
For large-size rubber expansion joints, use a short pipe section at one end for easier installation. First connect the expansion joint with the short pipe and the other end of the pipeline, then weld the short pipe to the long pipe section. This reduces labor intensity and improves safety.
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