Development and Analysis of Small Scale Water Accumulator by Using Piston Type

An accumulator is an auxiliary component in a hydraulic system as it stores the energy and avoids the pump from running continuously through the system which can reduce the pumps life. The accumulator is also used as the power source in the hydraulic hybrid system to accelerate the vehicle. A common hydraulic system uses the hydraulic oil as their working medium, but there is an application using water due to the high accessibility and environmental concern. In this paper, an accumulator is developed by using weighing method to increase the pressure in the system. This system uses water as a medium to provide clean environment as well as safe for mobile purpose. The system includes electric motor, water pump, directional control valve, pressure control valve and motor hydraulic. The performance of the accumulator is obtained by measuring the ratio of output and input pressure. The source of electricity is varied by using an inverter to control the frequency and the power of the pump. From the experiment, the pressure output and flow rate decreased with the increasing of the loads on top of the accumulator, while the pressure loss increased with the number of load. The operational frequency is optimal at a low reading compared to a higher frequency.

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Boom Motion Control Using Pressure Control Valve

8th FPNI Ph.D Symposium on Fluid Power ◽

10.1115/fpni2014-7853 ◽

2014 ◽

Cited By ~ 3

Author(s):

Jesper K. Sørensen ◽

Michael R. Hansen ◽

Morten K. Ebbensen

Keyword(s):

Motion Control ◽

Control Valve ◽

Pressure Control ◽

Flow Control Valve ◽

Directional Control ◽

Experimental Implementation ◽

In Series ◽

Pressure Control Valve ◽

Valve Control ◽

Loop Motion

This paper focuses on the reduction in oscillations created by counterbalance valves by using a proportional pressure control valve. The motion control of a cylinder boom is presented using this valve, which is a 4/3-way directional control valve with the main spool in series with an upstream compensator. The input to the valve control is a main spool position reference and, indirectly, the compensator downstream pressure. This gives a different flow gain and, therefore, a different feedforward scheme as compared to applications with the more common pressure compensated flow control valve. The theory behind the pressure control valve is presented and applied to both a theoretical and experimental implementation of closed loop motion control of the jib boom of a commercial vehicle loader crane.

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Effect of Parameter on Characteristics of Active Charge Accumulator for Water Hydraulic System

Volume 1A: Symposia, Part 2 ◽

10.1115/ajkfluids2015-11456 ◽

2015 ◽

Author(s):

Futoshi Yoshida ◽

Kenji Ito ◽

Shouichiro Iio ◽

Ato Kitagawa

Keyword(s):

Hydraulic System ◽

Basic Characteristic ◽

Experimental Approach ◽

Control Valve ◽

Pressure Change ◽

Pressure Control ◽

Output Flow ◽

Water Hydraulic ◽

Pressure Control Valve ◽

Piston Stroke

Active Charge Accumulator (ACA) is a new pressure convert technology which does not require any pressure control valve. ACA can be easily reduce or boost the pressure in water hydraulic system by using a multistage piston and on-off valves. This paper was focused on the basic characteristic of ACA especially for decompression process. The both of experimental approach and theoretical one were conducted. As the experimental results, it is revealed that the piston stroke of ACA strongly depends on the output flow rate and switching timing of the on-off valves. Analytical model of ACA was made and validated. As a result, it can be revealed influence of parameters on characteristics of ACA. The pressure change in the system was well estimated by the model.

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Static Characteristics of Pressure Control Valve

Strojnícky casopis – Journal of Mechanical Engineering ◽

10.1515/scjme-2017-0012 ◽

2017 ◽

Vol 67 (1) ◽

pp. 119-124

Author(s):

Ondřej Vykoukal ◽

Lumír Hružík ◽

Adam Bureček

Keyword(s):

Experimental Measurement ◽

Hydraulic System ◽

Check Valve ◽

Control Valve ◽

Pressure Control ◽

Static Characteristics ◽

Hydraulic Pump ◽

Relief Valve ◽

Pressure Control Valve

Abstract The article deals with the measurement of static characteristics of a pressure control valve. The pressure, at which the valve starts to leak oil, is adjusted by a spring. The measurement is performed on a hydraulic system that consists of tank, hydraulic pump, check valve, relief valve and pressure control valve which is measured. The results of this experimental measurement are Δp - Q characteristics of the pressure control valve for various pressure settings.

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