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A Novel Valve Concept Including the Valvistor Poppet Valve
Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.ORCID iD: 0000-0002-6371-1390
Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
2008 (English)In: Ventil : revija za fluidno tehniko in avtomatizacijo, ISSN 1318-7279, Vol. 14, no 5, 433-442 p.Article in journal (Other academic) Published
Abstract [en]

These days, energy efficient mobile fluid power systems are of great interest. A mobile system containing several different cylinder drives supplied with a single load sensing pump (LS-pump) has a number of advantages as well as disadvantages. One of the main advantages is the need of only one system pump. This makes the fluid power system compact and cost-effective. A challenge is to keep the hydraulic losses at low level, especially losses at smaller loads. This paper introduces a fail-safe proportional valve element that is based on the Valvistor poppet valve. Due to the demands of flexibility the poppet valve is bi-directional. The valve has an innovative hydro-mechanical layout that makes it fail-safe, unwanted lowering loads, for example, never occur. The new valve includes simple sensors that are suitable for identification of mode switches, e g between normal, differential and regenerative modes. It is also possible to maneuver the system with maintainted velocity control in the case of sensor failure. In a less complex system the concept has benefits as well. For example in systems where fail-safe-bi-directional on/off valves are needed, then without mode sensing capabilities.

Place, publisher, year, edition, pages
2008. Vol. 14, no 5, 433-442 p.
Keyword [en]
fluid power, poppet valve, Valvistor, bi-directional, fail-safe
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-43301Local ID: 73431OAI: oai:DiVA.org:liu-43301DiVA: diva2:264160
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2015-08-31Bibliographically approved
In thesis
1. Mobile Fluid Power Systems Design: with a Focus on Energy Efficiency
Open this publication in new window or tab >>Mobile Fluid Power Systems Design: with a Focus on Energy Efficiency
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This work deals with innovative energy efficient fluid power systems for mobile applications. The subjects taken up concern to what extent and how energy losses can be reduced in mobile working hydraulics systems. Various measures are available for increasing energy efficiency in these kinds of systems. Examples include:

Flow controlled systems The pump controller is switched from a load sensing toa displacement controlled one. The displacement is controlled in an open loopfashion directly from the operator’s demand signals. This reduces energy consumptionat the same time as dynamic issues that are attached to LS systemscan be avoided.

Individual metering valve systems Flexibility is increased by removing the mechanicalcoupling between the meter-in and meter-out orifices in directionalvalves. An overview of this kind of system is given in the thesis. A designproposal that has been implemented is also presented. Initial test results areshown. Patents for this particular system have been applied for.

Displacement control Metering losses are reduced by removing the directional valves.One pump is used for each load in such systems. This hardware layout involvesconsiderable changes compared to conventional systems. Displacementcontrolled systems are not studied in this work.

In mobile applications, overall efficiency is often poor and losses are substantial. The measures listed above can help improve this significantly in such applications. A flow dividing system can decrease energy consumption by about 10% and an individual metering system by about 20%. Losses in pump controlled systems are difficult to give a figure for; the losses are rather attached to the pumps and motors and not to the system layout. However, the losses for these systems are presumably even lower than for individual metering systems. The main focus in this work is on individual metering systems but questions about which components and so on are also treated. For example, the Valvistor valve concept has been studied as part of this work.

 

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2010. 77 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1339
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-61362 (URN)978-91-7393-304-9 (ISBN)
Public defence
2010-11-19, Planck, Fysikhuset, ing°ang 57, Campus Valla, Linköpings universitet, Linköping, 10:15 (English)
Opponent
Supervisors
Available from: 2010-11-16 Created: 2010-11-16 Last updated: 2015-08-31Bibliographically approved

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Eriksson, BjörnLarsson, JonasPalmberg, Jan-Ove

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