Precautions for restart of airbag and diaphragm accumulators

When charging air bag and diaphragm accumulators, nitrogen is often required to be very slow. If high-pressure nitrogen is allowed to expand rapidly when entering the airbag, it will cause the polymer material of the airbag to cool to a certain point and immediately brittle failure. Rapid inflation will also squeeze the airbag under the oil end conical valve, resulting in the airbag being cut. If the precharge pressure is too high or the precharge pressure is too low, the precharge system will be damaged.

Excessive pre inflation of airbag accumulator will clip the airbag into the assembled conical valve during pressure relief, resulting in damage to the conical valve or airbag. This is the basic cause of airbag failure.

Low pressure or no pre inflation can also be the over frequency fluctuation of airbag accumulator. As a result, the airbag is wrinkled and damaged at the top of the housing under system pressure. This will cause the airbag to be squeezed or punctured by the air valve. In this case, only one cycle will destroy the airbag.

Similarly, too high or too low pre charge pressure will cause the piston of the piston accumulator to reach the bottom of the end of stroke, damaging the piston and its seal. The good news is that if this happens, an audible and visual warning will be generated. That is, piston accumulators can be damaged by unqualified inflation. They are more tolerable than airbag accumulators.

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