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Janusz Rajda - One of the best experts on this subject based on the ideXlab platform.

  • Evaluation of pressure losses reduction possibility for WEH22 Directional Control valve by internal geometry correction
    2017
    Co-Authors: E Lisowski, Janusz Rajda
    Abstract:

    Evaluation of pressure losses reduction possibility for WEH22 Directional Control valve by internal geometry correction

  • pressure compensation using flow forces in a multi section proportional Directional Control valve
    Energy Conversion and Management, 2015
    Co-Authors: E Lisowski, G Filo, Janusz Rajda
    Abstract:

    The main subject of this article is pressure compensation in a multi-section proportional Directional Control valve. The undertaken compensation task was carried out without the use of neither additional compensating valves nor other correcting elements, such as sensors in a feedback Control system. The proposed method consists in the appropriate adjustment of forces acting on the valve spool. It requires knowledge of the electromagnet force characteristics and the appropriately matched stiffness and initial tension of the valve spring. In order to achieve the assumed objective, a number of CFD simulations was performed on a 3-D fluid model. The CFD analysis allowed determination of the values of flow resistance through the valve and the axial component of the flow force acting on the spool. The values calculated for various spool positions and flow velocities were approximated using analytical equations. Next, the mathematical model was built and simulations in Matlab/Simulink system were carried out. In the first stage of the research, flow characteristics of a single valve section were determined. The obtained results were then verified on the test bench. In the second stage, the simulation model was used to examine the possibility of pressure compensation in a three-section Control valve. In this case, the individual valve sections were loaded unevenly by applying pressure in a wide range of values. It has been demonstrated, that the appropriate shaping of the spool geometry allows usage of the flow forces for pressure compensation in multi-section proportional Directional Control valves.

  • Flow forces acting on the spool of Directional Control valve
    2015
    Co-Authors: Janusz Rajda, E Lisowski
    Abstract:

    This paper presents a method with the use of CFD analysis for calculating the forces acting on the spool during the flow of working liquid stream through the electro-hydraulic pilot operated Directional Control valve. The liquid stream flowing through the Directional valve causes hydrodynamic response according to the principle of conservation of momentum. Liquid pressure acting on the spool surface affects the forces balance of valve spool as well. An object of the research is the pilot operated Directional Control valve WEH22 type with flow rate up to 450 dm3/min. For the analysis ANSYS/Fluent software was used.

  • Multifunctional four-port Directional Control valve constructed from logic valves
    Energy Conversion and Management, 2014
    Co-Authors: E Lisowski, W. Czyzycki, Janusz Rajda
    Abstract:

    Abstract The paper refers to four-port solenoid pilot operated valves, which are subplate mounted in a hydraulic system in accordance with the ISO 4401 standard. Their widespread use in many machines and devices causes a continuing interest in the development of their design by both the scientific centers and the industry. This paper presents an innovative Directional Control valve based on the use of logic valves and a methodology followed for the design of it by using Solid Edge CAD and ANSYS/Fluent CFD software. The valve design methodology takes into account the need to seek solutions that minimize flow resistance through the valve. For this purpose, the flow paths are prepared by means of CAD software and pressure-flow curves are determined as a result of CFD analysis. The obtained curves are compared with the curves available in the catalogs of spool type Directional Control valves. The new solution allows to replace the whole family of spool type four-port Directional Control valves by one valve built of logic valves. In addition, the innovative Directional Control valve provides leak-proof shutting the flow paths off and also it can Control flow rate and even pressure of working liquid. A prototype of the valve designed by the presented method has been made and tested on the test bench. The results quoted in the paper confirm that the developed logic type Directional Control valve is able to meet all designed connection configurations, and the obtained pressure-flow curves show very good conformity with the results of CFD analysis.

  • cfd analysis of pressure loss during flow by hydraulic Directional Control valve constructed from logic valves
    Energy Conversion and Management, 2013
    Co-Authors: E Lisowski, Janusz Rajda
    Abstract:

    Abstract The aim of this paper is to investigate the reduction of flow resistance in a hydraulic system. The undertaken matter is focused on a spool type Directional Control valve with pilot operated check valves. In the paper there is a proposition of replacing a 4-way Directional Control valve with pilot operated check valves by suitable unit consisting of logic valves. Therefore, a body of new Directional Control valve has been designed. Four logic valves are mounted on the body and closed with a cover on which electromagnetic pilot valve is assembled. The hydraulic ports of the body are in accordance with the standard ISO 4401 – 08-07-0-94, so the proposed new Directional Control valve can be applied alternatively to a Directional spool valve. An important task given during the work is to create the systems of flow paths inside the body, which are assumed to be performed with simple technologies like: drilling, boring and milling. The system of the designed flow paths is verified by CFD analysis with the use of ANSYS/FLUENT program on three-dimensional model. Obtained results are compared with the results of the characteristics given in catalogues and coming from experimental research of the prototype. The difference in pressure loss during flow for the logic valve taken from CFD calculation and the catalogue do not exceed 5%. Presented in the paper Directional Control valve may operate for volumetric flow rate up to 450 dm 3 /min and the pressure up to 42 MPa. In the proposed solution, although simple technologies of making flow paths were applied, the pressure losses were reduced over 35%. The developed solution is close to a standard Directional spool valve and can be assembled on an identical sub-plate.

Holger F Hofmann - One of the best experts on this subject based on the ideXlab platform.

Terukazu Kosako - One of the best experts on this subject based on the ideXlab platform.

Zahurin Samad - One of the best experts on this subject based on the ideXlab platform.

  • Magneto-rheological Directional Control valve
    The International Journal of Advanced Manufacturing Technology, 2012
    Co-Authors: Maher Yahya Salloom, Zahurin Samad
    Abstract:

    The main part in hydraulic system is Directional Control valve. Directional Control valve has complex construction such as moving spool to Control the direction of actuator for required speed. Magneto-rheological (MR) fluid is one of Controllable fluids. Utilizing the MR fluid properties, direct interface can be realized between magnetic field and fluid power without the need for moving parts like spool in Directional Control valves. This study proposes the design of four ways/three position MR proportional Directional Control valve (4/3 MR valve). The construction of valve and the principle of work are presented. Analysis for magnetic circuit and simulation for valve performance were done. The experiment was conducted to show the principle work of the valve functionally. Design and finite elements analysis using FEMM software of the MR valves were done to reach the optimal design. The valve works proportionally to Control the direction and speed of hydraulic actuators. As the result, the optimal design of the valve achieved the optimum performance. The experimental result demonstrates the operation of 4/3 MR valve in 12 configurations. The 4/3 MR valve can replace many types of the spool Directional Control valve for Controlling hydraulic actuator.

  • Design and modeling magnetorheological Directional Control valve
    Journal of Intelligent Material Systems and Structures, 2011
    Co-Authors: Maher Yahya Salloom, Zahurin Samad
    Abstract:

    Directional Control valves are designed to Control direction of flow, while actuators maintain required speeds and precise positions. Magnetorheological (MR) fluid is a Controllable fluid. Utilizing the MR fluid properties, direct interface between magnetic fields and fluid power is possible, without the need for mechanical moving parts like spools. This study proposes a design of a four-way three-position MR Directional Control valve, presents a method of building, and explains the working principle of the valve. An analysis of the design and finite elements using finite element method of magnetism (FEMM) software was performed on each valve. The magnetic circuit of the MR valve was analyzed and the performance was simulated. The experiment showed the functional working principle of the MR valve. In conclusion, the MR valve proved to be effective in Controlling the direction and speed of hydraulic actuators proportionally. The proposed new design has the potential to reduce the complexity of Directional ...

  • experimental test of magneto rheological Directional Control valve
    Advanced Materials Research, 2011
    Co-Authors: Maher Yahya Salloom, Zahurin Samad
    Abstract:

    Directional Control valve is the main part in hydraulic system which has complex construction, such as moving spool to Control the direction of actuator for required speed. Utilizing MR fluid properties, direct interface can be realized between magnetic field and fluid power without the need for moving parts like spool in Directional Control valves. This paper dedicates the experimental test of four ways, three position MR Directional Control valve. The experimental methods were done by connecting the MR Directional Control valve with hydraulic actuators. The experiment was conducted to show the principle work of the valve functionally and performance test for valve was done. The valve works proportionally to Control the direction and speed of hydraulic actuators. As a result, the experimental result demonstrates the operation of MR Directional Control valve using two configurations. The experimental about ON-OFF and proportional operations is discussed. The MR Directional Control valve can replace many types of the spool Directional Control valve for Controlling hydraulic actuator.

E Lisowski - One of the best experts on this subject based on the ideXlab platform.

  • Evaluation of pressure losses reduction possibility for WEH22 Directional Control valve by internal geometry correction
    2017
    Co-Authors: E Lisowski, Janusz Rajda
    Abstract:

    Evaluation of pressure losses reduction possibility for WEH22 Directional Control valve by internal geometry correction

  • Flow forces acting on the spool of Directional Control valve
    2015
    Co-Authors: Janusz Rajda, E Lisowski
    Abstract:

    This paper presents a method with the use of CFD analysis for calculating the forces acting on the spool during the flow of working liquid stream through the electro-hydraulic pilot operated Directional Control valve. The liquid stream flowing through the Directional valve causes hydrodynamic response according to the principle of conservation of momentum. Liquid pressure acting on the spool surface affects the forces balance of valve spool as well. An object of the research is the pilot operated Directional Control valve WEH22 type with flow rate up to 450 dm3/min. For the analysis ANSYS/Fluent software was used.

  • Multifunctional four-port Directional Control valve constructed from logic valves
    Energy Conversion and Management, 2014
    Co-Authors: E Lisowski, W. Czyzycki, Janusz Rajda
    Abstract:

    Abstract The paper refers to four-port solenoid pilot operated valves, which are subplate mounted in a hydraulic system in accordance with the ISO 4401 standard. Their widespread use in many machines and devices causes a continuing interest in the development of their design by both the scientific centers and the industry. This paper presents an innovative Directional Control valve based on the use of logic valves and a methodology followed for the design of it by using Solid Edge CAD and ANSYS/Fluent CFD software. The valve design methodology takes into account the need to seek solutions that minimize flow resistance through the valve. For this purpose, the flow paths are prepared by means of CAD software and pressure-flow curves are determined as a result of CFD analysis. The obtained curves are compared with the curves available in the catalogs of spool type Directional Control valves. The new solution allows to replace the whole family of spool type four-port Directional Control valves by one valve built of logic valves. In addition, the innovative Directional Control valve provides leak-proof shutting the flow paths off and also it can Control flow rate and even pressure of working liquid. A prototype of the valve designed by the presented method has been made and tested on the test bench. The results quoted in the paper confirm that the developed logic type Directional Control valve is able to meet all designed connection configurations, and the obtained pressure-flow curves show very good conformity with the results of CFD analysis.

  • cfd analysis of pressure loss during flow by hydraulic Directional Control valve constructed from logic valves
    Energy Conversion and Management, 2013
    Co-Authors: E Lisowski, Janusz Rajda
    Abstract:

    Abstract The aim of this paper is to investigate the reduction of flow resistance in a hydraulic system. The undertaken matter is focused on a spool type Directional Control valve with pilot operated check valves. In the paper there is a proposition of replacing a 4-way Directional Control valve with pilot operated check valves by suitable unit consisting of logic valves. Therefore, a body of new Directional Control valve has been designed. Four logic valves are mounted on the body and closed with a cover on which electromagnetic pilot valve is assembled. The hydraulic ports of the body are in accordance with the standard ISO 4401 – 08-07-0-94, so the proposed new Directional Control valve can be applied alternatively to a Directional spool valve. An important task given during the work is to create the systems of flow paths inside the body, which are assumed to be performed with simple technologies like: drilling, boring and milling. The system of the designed flow paths is verified by CFD analysis with the use of ANSYS/FLUENT program on three-dimensional model. Obtained results are compared with the results of the characteristics given in catalogues and coming from experimental research of the prototype. The difference in pressure loss during flow for the logic valve taken from CFD calculation and the catalogue do not exceed 5%. Presented in the paper Directional Control valve may operate for volumetric flow rate up to 450 dm 3 /min and the pressure up to 42 MPa. In the proposed solution, although simple technologies of making flow paths were applied, the pressure losses were reduced over 35%. The developed solution is close to a standard Directional spool valve and can be assembled on an identical sub-plate.

  • cfd analysis of pressure loss during flow by hydraulic Directional Control valve constructed from logic valves
    Energy Conversion and Management, 2013
    Co-Authors: E Lisowski, Janusz Rajda
    Abstract:

    Abstract The aim of this paper is to investigate the reduction of flow resistance in a hydraulic system. The undertaken matter is focused on a spool type Directional Control valve with pilot operated check valves. In the paper there is a proposition of replacing a 4-way Directional Control valve with pilot operated check valves by suitable unit consisting of logic valves. Therefore, a body of new Directional Control valve has been designed. Four logic valves are mounted on the body and closed with a cover on which electromagnetic pilot valve is assembled. The hydraulic ports of the body are in accordance with the standard ISO 4401 – 08-07-0-94, so the proposed new Directional Control valve can be applied alternatively to a Directional spool valve. An important task given during the work is to create the systems of flow paths inside the body, which are assumed to be performed with simple technologies like: drilling, boring and milling. The system of the designed flow paths is verified by CFD analysis with the use of ANSYS/FLUENT program on three-dimensional model. Obtained results are compared with the results of the characteristics given in catalogues and coming from experimental research of the prototype. The difference in pressure loss during flow for the logic valve taken from CFD calculation and the catalogue do not exceed 5%. Presented in the paper Directional Control valve may operate for volumetric flow rate up to 450 dm 3 /min and the pressure up to 42 MPa. In the proposed solution, although simple technologies of making flow paths were applied, the pressure losses were reduced over 35%. The developed solution is close to a standard Directional spool valve and can be assembled on an identical sub-plate.