Under what circumstances do rubber joints need to be fitted with a restriction device?

Under what circumstances do rubber joints need to be fitted with a restriction device?
Rubber joints are a common pipeline connection used to regulate the audio and video flow of pipelines. Due to the special structure and design of rubber joints, it can prevent collision and damage of pipes and ensure the safety of pipeline operation. However, in the process of use, rubber joints need to be installed with restriction devices.
 
When the diameter or length of the pipe changes, the rubber joint needs to be installed with a limiting device. For example, when a pipe needs to be replaced or modified, the rubber joint needs to be replaced to fit the new pipe diameter or length. At this time, installing a limit device can prevent the rubber joint from working beyond its rated size and avoid collision and damage to the pipeline. When the fluid medium of the pipeline changes, it is also necessary to install a limit device. For example, when the flow rate of the medium in the pipeline increases, the rubber joint needs to be installed with a limit device to avoid excessive bending and tearing.
 
There are many other cases when rubber joints need to be installed with limit devices, for example, when the pipeline needs to be installed or repaired, the rubber joint needs to be replaced.