Piston accumulators

A) Greater volumetric efficiency, since:

• They can work by completely empty of gas without deterioration of the piston.
• The relation between maximum and minimum pressures can reach a value of 25, much more higher than in bladder type.
• The Direct contact of the gas with the internal surface of the accumulator reduces the compression coefficient of the gas.
• It can be used as a transfer application with an auxiliary gas bottle.

b) The quick displacement of the piston, its low weight and its unrestricted connection port section, allows a high output flow. The response time of the piston is of the order of 3 milliseconds.

c) The modular construction allows the manufacture of many different sizes from basic components, resulting in:

• Competitive prices, especially with the transfer application (where a nitrogen bottle is connected to the gas side of the piston accumulator).
• Accumulators sized according to your needs space constraints in your facilities.
• Interchangeable spare parts.
• Minimum cost of service and maintenance.

• In applications where a potential sudden rupture of the bladder, with the resulting complete discharge of the gas into the circuit, could represent a hazard or be functionally unacceptable (due to the dissolution of the gas in the reservoir oil and the consequent possibility of Cavitation occurs in the pump).
• When the liquid has to be stored between a narrow pressure differential and additional gas bottles are used (transfer application).
• When the pre-charge pressure is very similar to the minimum working pressure.
• When a high flow rate is in place and a minimum differential pressure is required.
• When the sudden complete discharge of the stored liquid takes place.
• When the maximum working pressure is more than four times the pre-charge pressure.

• When the total cycle duration (load + discharge) is less than 1 second.
• When the size of the particles of impurities in the circuit is greater than 75 microns and/or the liquid in the circuit is incompatible with the use of lapping inner surface in carbon steel or stainless steel.