Hydraulikventile

Gebhardt, Norbert; Lübbert, Jan; Kolks, Giacomo; Weber, Jürgen

doi:10.1007/978-3-662-60664-3_6

Cited by 6 publications

(5 citation statements)

References 5 publications

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“…The countersurface of the sealing on the inside of the tube is a roller burnished pressure vessel steel (EN 10028) with the measured initial average roughness of Rz = 0.758±0.095 µm and Ra = 0.077±0.008 µm (see also Figure 10). Piston-type accumulators, comprising a cylinder with a sealed, freely floating piston that separates gas (usually nitrogen) from oil, offer several advantages over bladder and membrane accumulators [9]. These advantages include the ability to operate at both high and low temperatures, and higher flow rates, resulting in higher gas compression ratios and better volume utilization rates.…”

Section: Piston Accumulatorsmentioning

confidence: 99%

Run-in Behaviour and Wear on Hydraulic Piston Seals – Evaluation of an Endurance Test for Piston Accumulators

Schulze,

Boyko,

Lenz

et al. 2024

14th International Fluid Power Conference

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Hydraulic accumulators are essential components in both industrial and mobile hydraulic systems, serving various purposes from energy storage to shock absorption and energy recovery. In hydraulic pitch systems of wind turbines, piston accumulators provide significant advantages, including reliability, resilience to centrifugal forces and temperature fluctuations, as well as simple monitoring. Ensuring a proper seal between the gas and oil sides of a piston accumulator and understanding its wear characteristics are crucial for a reliable operation of the system. A precise determination of wear often requires the use of measured values.The current paper presents the results of a 5,000-hour endurance test conducted for piston accumulators under load conditions typical for wind turbine applications and reveals insights into the run-in behaviour and wear process of the seals. During and following the test, parameters such as sealing geometry and surface roughness of inner accumulator tubes were measured. The accordance of the measured wear with Archard wear model behaviour is assessed. It could be shown that errorfree sealing conditions can be expected for a period of about 20 years.

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Section: Piston Accumulatorsmentioning

confidence: 99%

Run-in Behaviour and Wear on Hydraulic Piston Seals – Evaluation of an Endurance Test for Piston Accumulators

Schulze,

Boyko,

Lenz

et al. 2024

14th International Fluid Power Conference

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“…Definitions are accepted for the filter fineness [9]: 1. nominal filtration fineness -no usual βx values are established; this means that only part of the filterable impurities with an optimal filter is removed by filtration. For βx≥20 -this corresponds to a precipitation degree of about 95%; 2. absolute filtration fineness -from a value of βx≥100 or a precipitation degree of 99%, the filtration fineness is designated as absolute retention speed.…”

Section: Fig 5 the Representation Of The Deposition Of Impurity Parti...mentioning

confidence: 99%

Constructive-Functional Analysis and Sizing of Hydraulic Filters

Baroiu

Moroșanu

2022

Ann_UGAL_TMB

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The reliability of hydrostatic installations depends on the low level of impurities in an environment with pressure at an allowable value, which avoids an accentuated wear of the individual elements of the installations. Hydraulic filters are elements that have a role in protecting the hydrostatic installations from the particles that are found in the hydraulic oil. The paper aims to present some of the elements underlying the construction of hydraulic environment filtration equipment, certain conditions that are imposed on them, as well as the main problems related to the calculation and sizing of filters.

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“…In hydrostatic schemes, trail flow control valves, Figure 4, can be used simply, in which case there are only adjustable hydraulic resistances, the flow change being done by increasing or decreasing a slot of a certain shape [5][6][7][8].…”

Section: Fig 3 Classification Of Flow Control Valvesmentioning

confidence: 99%

Constructive-Functional Analysis and Calculation of Flow Control Valves

2022

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In hydraulic installations, the flow regulation is performed in two ways: volume regulation (by variable flow pump) and resistive regulation, with the help of the flow regulation equipment. The second variant, although with lower energy efficiency, is most often preferred in small and medium power installations, due to the constructional simplicity and easy maneuverability of the equipment, as well as the ease of performing operation control. The paper presents the construction of the most important devices for resistive flow regulation, the mode of operation and installation in the structure of the systems, as well as certain elements of their calculation.

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Hydraulikventile

Cited by 6 publications

References 5 publications

Run-in Behaviour and Wear on Hydraulic Piston Seals – Evaluation of an Endurance Test for Piston Accumulators

Run-in Behaviour and Wear on Hydraulic Piston Seals – Evaluation of an Endurance Test for Piston Accumulators

Constructive-Functional Analysis and Sizing of Hydraulic Filters

Constructive-Functional Analysis and Calculation of Flow Control Valves

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