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Wyniki wyszukiwania dla: HYDRAULIC VALVE

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Wyniki wyszukiwania dla: HYDRAULIC VALVE

  • Hydraulic valve design methodology for hydro turbine control system

    Publikacja

    - FLOW MEASUREMENT AND INSTRUMENTATION - Rok 2024

    The control of the turbine and its equipment in a hydroelectric power plant requires the HPU (hydraulic power unit) to deliver large volumes of working fluid in a short time at specific optimum control parameters. The use of typical proportional flow control valves created by manufacturers of hydraulic components in low-pressure control systems is disadvantageous due to high pressure losses in the control chambers. This paper presents...

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  • Effect of Simultaneous Valve Closures in Hydraulic Piping Systems

    Publikacja

    - Rok 2023

    The paper investigates wave interference (between pressure waves) occurring in simple hydraulic systems. Water hammer was induced by simultaneous closure of three valves located at the reservoirs of a “Y” type hydraulic system. Numerical simulations were carried out with the help of the freeware computer package Allievi enabling the reader to replicate results in a direct manner. The influence of the following quantities has been...

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  • Initial Investigation of Wave Interactions During Simultaneous Valve Closures in Hydraulic Piping Systems

    Publikacja

    - WATER RESOURCES MANAGEMENT - Rok 2023

    The effects of interference of pressure waves in simple piping systems were studied. A freeware computer code Allievi developed at the University of Valencia was used to simulate dynamic waveforms in simple and complex networks. The tests were carried out according to three scenarios. No pressure increases significantly exceeding the Joukowsky pressure in simple cases were noticed. When the effects of the simultaneous closing of...

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  • DIGITAL HYDRAULICS CIRCUIT BASED ON PWM FUNCTION FOR CONTROLLING HYDRAULIC ACTUATOR POSITION

    Publikacja

    - Rok 2022

    Hydraulic systems are used in many different industries, such as multi-source hydrostatic drive systems. In traditional hydraulic systems, a proportional servo valve is used to control the position of hydraulic actuators. The low energy efficiency and high cost of these control valves are two major problems with these systems. Digital hydraulics is one of the most unique ideas on how to solve these problems. Researchers like digital...

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  • CFD Simulations and Tests of a Prototype Flow Control Valve

    Publikacja

    - Rok 2021

    In this paper a prototype of a flow control valve is described and numerically simulated. The flow control valve is used in hydraulic systems to maintain constant fluid flow despite changing loads of a receiver. The standard construction of this type of valves is modified mainly by eliminating the spring. The prototype consists the hydrostatically unloaded throttle valve and pressure ratio valve substituting pressure difference...

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