What is the role and use of rubber expansion joint

What is the role and use of rubber expansion joint
Before formal dosing, the dissolving pool should be filled with clean water, and the import and export valves of the rubber expansion joint are all opened. Before starting the pipeline, flush the dosing pipeline with clean water, and during the operation of the pipeline, pay attention to observe the change of pipeline pressure, and observe whether there is any leakage in the dosing pipeline and valves; Since the rubber joint is a single-cylinder single-acting reciprocating pipeline, the pulsation rate of its flow pressure is even greater.
 
In order to eliminate pulsation, increase the smoothness of flow pressure, reduce pipeline vibration and the degree of impact on process performance, it is generally recommended that the reciprocating pipeline outlet installation has to reduce the pulsation of the pipeline. Sometimes also in order to increase the suction performance of the suction inlet also installed in the inlet pipe. The volume of the pipe from the pulsation reduction in terms of course, the larger the better, but the larger the more uneconomical, so it should be controlled within certain limits. Rubber force transfer joint pipe volume selection is generally followed: the metering capacity of each stroke (mL) multiplied by 26, it can be derived to reduce 90% of the pulsation required for the minimum volume of the pulse damper (mL). The use of the flow adjustment mechanism is not limited by start-up or shutdown, and it should be locked after the adjustment is completed to prevent the position of the mechanism from drifting due to vibration, which affects the metering accuracy.
 
In general, a larger stroke corresponds to a larger rated flow rate, stroke zero corresponds to zero flow rate, and is a linear change in the relationship. Rubber joints are used to prevent excessive pressure in the pipeline cavity to protect the pipeline and the safety of the device, before leaving the factory, the pipeline manufacturer has been based on the rated discharge pressure of the pipeline will be rubber joints of the starting pressure set up, in use, generally do not need to be adjusted again.