“Top Easy Maintenance Design” of the NACOL accumulators allows safe, short time, and easy accumulator shell inside inspection and bladder replacement job, and relieves workers from hard and dangerous jobs.
Also, this design allows to do above jobs without splashing oil around. So, it is so-called “Generous to the Environment” Design Accumulator.
Other accumulator manufacturer’s products whose design makes the bladder assembling inspection (checking bladder bending and twisting caused by the improper bladder installation) after the bladder installation to the accumulator impossible. These phenomena lead to the premature bladder failures.
On the other hand, NACOL’s “Top Easy Maintenance Design” allows easy shell inside inspection through large opening at the top of the shell and eliminates creating the cause of the bladder failures at the time of bladder assembly.

The Dynac Gas Valve contains two parts ⓐ and ⓑ which have fuse function and melt at the temperature 160±20℃, and vent the charged gas in the event of fire or extreme heat.

Bladder is transformed by the pressure difference between inside and outside of the bladder, and the transformation always starts from the weakest(thin wall thickness) bladder part.
Then, that same part keeps transforming repeatedly. Therefore, it is necessary to take measure to prevent the bladder rupture developed from the wrinkle and/or the crack those are easily generated to the area where fatigue concentration may occur.
In that respect, NACOL bladders keep ideal “Curving triangular stelliform” shape throughout the transformation owing to the NACOL devices of original pleated structure and plateau at the bottom of the bladder which makes the bladder shape round at every edges. Therefore, the stress concentration to the bladder is dispersed effectively suppressing the generation of the wrinkle and prevent the bladder damage as the result of the fatigue concentration.
Moreover, when the working fluid with large specific gravity (Water based and Synthetic based) is used, bladder receives larger buoyancy than the time of Mineral Oil based working fluid is used.
Even on such occasion, NACOL bladder forms a triangular stelliform pillar vertically owing to the pleated structure, and the pillar suppresses the bottom area of bladder to rise up by the buoyancy(U-turn phenomenon), and the bladder damage can be eliminated.

NACOL bladders for standard accumulators are seamless one-piece molded bladders, so the stress concentration hardly occurs and can be used stably for a long term period.
However, Competitor’s Seamed Bladder can be easily molded and saves the manufacturing cost. But the wall thickness of the sticked part of seamed bladder gets thicker and the hardness is changed from the other bladder area.
When the bladder transforms, stress concentrates to the seamed part all the time, and such seamed area becomes the cause of the fatigue damage.