Estimation of erosion effects due to solid contaminant in hydraulic valves

2020 ◽

pp. 43-47

Author(s):

A. V. Fominykh ◽

D. N. Ovchinnikov ◽

I. R. Chinyaev

Keyword(s):

Hydraulic System ◽

Livestock Building ◽

Hydraulic Valves

The hydraulic system of removal of manure from the four-row livestock building on 800 cows with the use of locking and regulating hydraulic valves is offered.

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Analytical Method for Defining Pressure Compensator Dynamics

10.1115/imece2000-1983 ◽

2000 ◽

Author(s):

Timo J. Käppi ◽

Asko U. Ellman

Keyword(s):

Fluid Power ◽

Time Domain Simulation ◽

First Order ◽

Lack Of Information ◽

Valve Dynamics ◽

Accepted Practice ◽

Component Models ◽

Hydraulic Valves ◽

Power Component ◽

Stationary Behavior

Abstract Computer simulation is a powerful and generally accepted practice to carry out research in the area of fluid power. However, accurate parameterization of the component models is required to achieve correct simulation results. The parameters describing the stationary behavior of hydraulic valves are easily available from valve manufacturers’ catalogues. The dynamics are presented typically for the servo valves only. The dynamics of pressure valves are usually more or less unknown even for the manufacturers. Numerical values for simulation purposes are very rarely available. The lack of information concerning valve dynamics makes the component measurements unavoidable. This is time consuming and costly and the benefits of simulation concept in general are reduced. In this paper a method for defining first order dynamics for the pressure compensator is presented. This method can be used in time-domain simulation of fluid power components and systems. The method is based on the analytical dimensions of valve such as diameter of damping orifice, spring constant and mass. Pressure compensated mobile valve is measured for method verification. The presented method can be applied to any type of commercially available well damped single-stage pressure valves. It makes the fluid power component parameterization considerably easier and thereby the advantages reached by simulation are increased.

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Measuring the bore straightness during reaming with sensoric tools

Production Engineering ◽

10.1007/s11740-020-00977-6 ◽

2020 ◽

Vol 14 (4) ◽

pp. 535-544

Author(s):

Andreas Bretz ◽

Eberhard Abele ◽

Matthias Weigold

Keyword(s):

Mass Production ◽

Cost Efficiency ◽

Machine Tools ◽

Processing Time ◽

Process Chain ◽

Machining Processes ◽

High Quality ◽

Random Samples ◽

Hydraulic Valves ◽

Productive Time

Abstract Reaming plays a crucial role in production to meet the high quality requirements of precision bore machining. It is either directly responsible for the final component quality or influences subsequent processes such as honing. The narrow tolerances are usually monitored by measuring random samples in mass production due to cost efficiency. Having a closer look at an exemplary process chain for the production of hydraulic valves shows the possibility to adapt the honing parameters which reduces processing time and costs. However, the bore straightness after the reaming process has to be known. In this paper an approach is presented which allows to record the bore straightness within the productive time. For this purpose, a sensory reaming system is developed. It can be used without additional components in the machine tool and thus integrated into existing machining processes. Cutting tests show that the system is able to measure the bore straightness as good as sensing probes used in machine tools.

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Basic Hydraulic Valves and Circuits

Fluid Power Design Handbook ◽

10.1201/9781482295474-8 ◽

1995 ◽

pp. 79-91

Keyword(s):

Hydraulic Valves

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Material Analysis and Molecular Dynamics Simulation for Cavitation Erosion and Corrosion Suppression in Water Hydraulic Valves

Materials ◽

10.3390/ma13020453 ◽

2020 ◽

Vol 13 (2) ◽

pp. 453 ◽

Cited By ~ 3

Author(s):

Masoud Kamoleka Mlela ◽

He Xu ◽

Feng Sun ◽

Haihang Wang ◽

Gabriel Donald Madenge

Keyword(s):

Molecular Dynamics ◽

Md Simulation ◽

Essential Role ◽

Corrosion Inhibitors ◽

Cavitation Erosion ◽

Dynamics Simulation ◽

Preference Ranking ◽

Water Hydraulics ◽

The Impact ◽

Hydraulic Valves

In the milestone of straggling to make water hydraulics more advantageous, the choice of coating polymer for water hydraulics valves plays an essential role in alleviating the impact of cavitation erosion and corrosion, and this is a critical task for designers. Fulfilling the appropriate selection, we conflicted properties that are vital for erosion and corrosion inhibitors, as well as the tribology in the sense of coefficient of friction. This article aimed to choose the best alternative polymer for coating on the selected substrate, that is, Cr2O3, Al2O3, Ti2O3. By applying PROMETHEE (Preference Ranking Organization Method for Enrichment Evaluations), the best polymer obtained with an analyzed performance attribute is Polytetrafluoroethylene (PTFE) that comes up with higher outranking (0.5932052). A Molecular Dynamics (MD) simulation was conducted to identify the stronger bonding with the regards of the better cleave plane between Polytetrafluoroethylene (PTFE) and the selected substrate. Polytetrafluoroethylene (PTFE)/Al2O3 cleaved in (010) plane was observed to be the strongest bond in terms of binding energy (3188 kJ/mol) suitable for further studies.

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Air spreading through wetted cellulose membranes: Implications for the safety function of hydraulic valves in plants

Physical Review E ◽

10.1103/physreve.100.032409 ◽

2019 ◽

Vol 100 (3) ◽

Cited By ~ 2

Author(s):

JooYoung Park ◽

Taesik Go ◽

Jeongeun Ryu ◽

Sang Joon Lee

Keyword(s):

Safety Function ◽

Cellulose Membranes ◽

Hydraulic Valves

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Design and Implementation of the Integrated Test Platform for the Hydraulic Components

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.605-607.1340 ◽

2012 ◽

Vol 605-607 ◽

pp. 1340-1344

Author(s):

Zhi Hai Liu ◽

Qing Liang Zeng ◽

Cheng Long Wang ◽

Hong Xi Kang

Keyword(s):

Performance Testing ◽

Flow Diagram ◽

Test Bed ◽

Hydraulic Motor ◽

Hydraulic Pump ◽

Hydraulic Test ◽

Access Technology ◽

New Type ◽

Composition Structure ◽

Hydraulic Valves

In this paper, a new type of hydraulic test bed is developed which can be used for performance testing of hydraulic valves, hydraulic motor and hydraulic pump. The composition structure diagram of hydraulic system, power supply system, and the signal flow diagram of data acquisition system were designed. The characteristics of the LabWindows/CVI development tools and the usage of Prodave MPI/IE 6 network communication tools were introduced, also the database storage and access technology in LabWindows/CVI environment. It was proved through the practical application that the test bed is reliable and has the merit of higher precision and automation level, and simple operation.

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Characterization and Mathematical Modelling of Geometric Effects on Piezoelectric Actuators

Integrated Ferroelectrics ◽

10.1080/10584587.2019.1668704 ◽

2019 ◽

Vol 201 (1) ◽

pp. 201-217

Author(s):

Hareem Jawaid ◽

Waqar Ahmed Qureshi ◽

Riffat Asim Pasha ◽

Rizwan Ahmed Malik

Keyword(s):

Mathematical Model ◽

Structural Analysis ◽

Mathematical Modelling ◽

Piezoelectric Actuator ◽

Piezoelectric Actuators ◽

Numerical Results ◽

Hydraulic Valves ◽

Geometric Effects

This paper focuses on the characterization and static structural analysis of piezoelectric actuator to investigate the sequential increasing effect of piezoelectric patches. The effect on the tip deflection is observed analytically, numerically and experimentally. By varying the quantity and the geometry of piezoelectric patches/beams, the actuation effect is analyzed. A mathematical model has been developed for the unequal lengths of patches and beam. The analysis is carried out numerically to examine the tip deflection under various parameters. The results are analyzed and verified experimentally. The results are found to be in accordance with the analytical and numerical results. This permits the desired configuration of an actuator in applications like hydraulic valves for actuating and controlling the flow of liquid as per need.

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