hydraulic accumulator

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Related to hydraulic accumulator: hydraulic intensifier

hydraulic accumulator

[hī′drȯ·lik ə′kyü·myə‚lād·ər]
(mechanical engineering)
A hydraulic flywheel that stores potential energy by accumulating a quantity of pressurized hydraulic fluid in a suitable enclosed vessel.

Hydraulic accumulator

A pressure vessel which oper-ates as a fluid source device or shock absorber. It is used to store fluid under pressure or to absorb excessive pressure increases. The hydraulic accumulator is an energy-efficient component, which allows the use of a smaller pump to achieve the same end results in terms of cylinder rod actuation speeds. In certain circuit designs, the accumulator will permit a pump motor to be completely shut down for an extended period of time while the accumulator supplies the necessary fluid to the circuit.

The operation of the hydraulic accumulator is induced by a pressurized gas (usually nitrogen), a spring, or a weighted plunger. The accumulator supplies fluid for actuator movement or to replace fluid lost by leakage. The gas-charged accumulator and the spring-type accumulator discharge their fluid into the system at pressures which are decreasing as the gas or spring expands. The weighted accumulator allows stored fluid to be discharged into the system at a constant pressure for the entirety of its downward stroke. See Control systems, Hydraulics, Pump

References in periodicals archive ?
Hydraulic energy recuperation from braking with the help of hydraulic accumulators helps to meet the demand for fuel-saving solutions.
The hydraulic accumulator utilizes a variable-volume pump to optimize energy efficiency.
Braking energy is recovered and fed back into the mains, and charging of the hydraulic accumulator is controlled to build no more pressure than actually needed, giving an overall energy saving of 40 per cent compared with an equivalent hydraulic machine.
At slow working cycles, like in this case, the right transformation for the accumulator is the isotherm one, which leads us, knowing also the system pressure, to the necessary volume of the hydraulic accumulator, (Saceanu, 2004).
The acquisition of the Olaer Group is expected to expand Parker's presence in geographic growth areas and allow it to offer expertise in hydraulic accumulator and cooling systems for target growth markets such as oil and gas, power generation and renewable energy.
to its e-motion T all-electric tiebar presses and also is rolling out the e-cap system, an all-electric line dedicated to caps and closures and designed to compete with hydraulic accumulator machines (reported in July, see Learn More).
Parker Hannifin Hydraulic Accumulator Division's release of the latest version of inPHorm sizing and selection software provides a user-friendly format for determining the proper accumulator product for a given application.
Four pressure sensors in the wheel pressure modulators and one pressure sensor each for the hydraulic accumulator and for the brake commands monitor the processes.
Earlier this month, the company finalised the acquisition of British advanced hydraulic accumulator and cooling technologies developer Olaer Group, which was first announced in April 2012.