What are the causes of rubber expansion joint leakage?

Rubber expansion joint is more commonly used pipeline soft joint, some customers in the use of rubber expansion joint response to the phenomenon of water leakage, so if the rubber expansion joint leakage, what are the reasons for it?
 
1 . Some customers want to buy cheap rubber expansion joints, often do not pay attention to quality issues, if the quality of rubber is not good, the production process does not meet the requirements, in the process of use will appear Lato, the phenomenon of water leakage.
2 . In fact, rubber expansion joints can also be called rubber soft joints, there is a certain amount of expansion. Some people think that the rubber material can be stretched and compressed at will, but often the phenomenon of being pulled off occurs, leading to water leakage.
3 . Each product has an implementation standard, in which the expansion amount of each model is clearly marked, as well as a certain deflection angle. Rubber joints are executed in strict accordance with the standards in the whole production process. In order to ensure the quality of rubber joints.
4 . The purpose is to prevent the sphere from being pulled off due to the displacement of the pipeline, which leads to water leakage.