Wyniki wyszukiwania - BazTech

1

Quality improvement of a safety valve with the use of numerical and experimental studies

Filo Grzegorz, Domagała Mariusz, Lempa Paweł, Fabiś-Domagała Joanna, Kwiatkowski Dominik, Momeni Hassan

Quality Production Improvement - QPI

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2019

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Vol. 1, Iss. 1

378--385

EN

This article presents results of numerical modelling, simulation and test bench experiments of a hydraulic direct-acting relief valve was used as a safety valve. The analyzed safety valve was placed in a system consisting of a fixed-speed pump, a control valve, a hydraulic cylinder as an actuator and a second pressure valve in the load line used as a payload generator for the cylinder. In the first step mathematical model of the system was formulated in the form of a system of ordinary differential equations. Next, simulation model was created in Matlab/Simulink. Simulations were carried out for different values of the actuator payload. The obtained results include time series of pressure, flow rate and displacement of the actuator piston. In order to confirm simulation results, a test bench was built and series of experiments were carried out. High compliance of simulation and laboratory results was obtained. It was confirmed that the proposed solution with the relief valve used as a safety valve fulfills its task of protecting the hydraulic system from excessive pressure increase.

2

Numerical simulation of fluid flow inside the flow control valve

Domagała Mariusz, Momeni Hassan, Fabis-Domagała Joanna, Krawczyk Mariusz, Filo Grzegorz, Bikass Saeed

Quality Production Improvement - QPI

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2019

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Vol. 1, Iss. 1

394--399

EN

Hydraulic valves are widely used in many branches and they are still developed and improved. Due to the problem with verification of flow phenomena which appears during valves operation numerical simulations methods are tools which allows to improved valves design. This paper presents numerical simulation of fluid flow inside flow control valve.

3

Matrix FMEA analysis of the flow control valve

Fabis-Domagala Joanna, Momeni Hassan, Domagala Mariusz, Filo Grzegorz, Bikass Saeed, Lempa Paweł

Quality Production Improvement - QPI

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2019

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Vol. 1, Iss. 1

590--595

EN

Reliability is a key feature in engineering systems and might be improved by using preventive methods, which allows for identification potential failures and establishing cause-and-effect relationships in consistent and systematic way. One of the popular quality improvement method is FMEA (Failure Modes and Effects Analysis). An application of matrix FMEA analysis method on example of flow control valve has been presented and discussed in the work. Presented example shows also a different ways of evaluating failures and theirs influence on analysis results.

4

Preliminary analysis of a innovative type of low pressure valves

Klarecki K.

Journal of Achievements in Materials and Manufacturing Engineering

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2010

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Vol. 41, nr 1-2

131-139

EN

Purpose: Presentation and analysis of the innovative type of a direct operated low pressure relief valves. Design/methodology/approach: In this paper was presented a proposal of a improvement of a new low pressure relief valve. The advantages and disadvantages of this valve was estimated by numerical simulation with MATLAB/SIMULINK aid. Findings: Main advantages of presented relief valve are: high precision of the operating pressure and short time responses, the disadvantage of the modelled valve is the high value of the peak pressures. Research limitations/implications: The expected next stage of valve research is the experimental tests. For that purpose one should the prototype of valve build. Practical implications: Presented low pressure relief valve can be used in low pressure hydraulic system, for example for feeding of the hydrostatic or hydrodynamic bearings. Originality/value: Original value of this paper is a idea of low pressure relief valve.

5

Modelowanie zaworu przelewowego przy zastosowaniu programów CAD i CFD

Lisowski E., Domagała M.

Systems : journal of transdisciplinary systems science

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2002

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Vol. 7, No. 1 sp.

343-348

PL

W pracy przedstawiono modelowanie geometrii i przepływu w zaworze przelewowym hydraulicznego układu maszyny roboczej przy zastosowaniu programów CAD i CFD. Program SolidWorks wykorzystano w modelowaniu geometrii natomiast do analizy zjawisk przepływowych w zaworze wykorzystano oprogramowanie. W szczególności podjęto analizę wyznaczenia rozkładu ciśnień i prędkości przy przepływie przez zawór.

EN

CAD and CFD systems in application of relief valve modeling are presented in this paper. Solid Works package was used in geometry modeling whereas analysis of flow phenomena carried out in Fluent. The paper also contains results of CFD analysis for axisymmetric, incompressible flow.