Hydraulic Bladder Accumulator

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Hydraulic bladder accumulator
Hydraulic bladder accumulator schematic diagram

A bladder accumulator is constructed by entering a flexible bladder inside a shell. The hydraulic bladder accumulator has a larger diameter at the top and smaller at the bottom. The bladder bag is made from synthetic rubber which is thinner at the top than at the bottom. The accumulator work on Barlow’s formula which states: “The stress in a circle is directly proportional to its diameter and wall thickness.”

The formula means a large diameter circle will stretch faster than a small diameter circle; therefore the bladder will stretch at the top and continue downward to push itself outward against the walls of the shell.

The bladder inside the accumulator is capable of squeezing out all the hydraulic oil from the accumulator. The bladder accumulator is capable of supplying a large percentage of the stored fluid to do work since it has a very high volumetric efficiency.

The bladder bag is precharged with air or inert gas to a specified pressure. The hydraulic fluid is then pumped into the area around the bladder, further compressing the gas in the bladder. This type of accumulator is less danger of an explosion since there is no exposure of fluid to the gas charge.

 

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