Abnormal Opening Mechanism of Pilot-Operated Relief Valve Under Alternating Pressure

Hao, Qianhua; Wu, Wanrong; Li, Zhi; Liang, Xiangjing

doi:10.1109/access.2019.2939477

Cited by 6 publications

(3 citation statements)

References 29 publications

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“…[ [95][96][97] Overflow energy loss in Pilot proportional relief valve Energy losses in valve-controlled hydraulic systems are divided between throttling loss in control valves and overflow loss in relief valves. Overflow loss is one of the main concerns regarding the inefficiency of the hydraulic system.…”

Section: Design Of Pilot Operated Relief Valvesmentioning

confidence: 99%

A Review of Pilot-operated Hydraulic Valves – Development, Challenges, and a Comparative Study

Elsaed,

Linjama

2023

TJFP

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Hydraulic systems have been widely used due to their high power-to-weight ratio. Despite the growing instances of being superseded by the electromechanical counterparts at low power levels, the market was incapable of presenting alternatives for large-size applications. Additionally, in recent years, the demand for more significant heavy machinery (Mobile & Industrial) has increased, which led to the necessity of even higher flow and pressure Pilot-operated valves, despite the fact that these valves have several issues. One might think the alternative could be developing a hydraulic system that does not rely on Pilot-operated valves, but after decades of research, these systems could not get close to the performance of Pilot-operated Multistage valves. The paper presents a comprehensive study of the progress accomplished from the year 2016 to early 2022 in hydraulic Pilot-operated valves; they are widely employed among ordinary valves, proportional valves, and state-of-the-art digital hydraulics. Higher efficiency will be a primary factor in the success of the new designs. The academia presented several studies to improve the Pilot valves’ performance, but still, they are limited. There are no dramatic developments, and there are only a few upgrades.

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Section: Design Of Pilot Operated Relief Valvesmentioning

confidence: 99%

A Review of Pilot-operated Hydraulic Valves – Development, Challenges, and a Comparative Study

Elsaed,

Linjama

2023

TJFP

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“…(1) Environmental factors can accelerate sensor failure due to element defects. Due to the severe construction environment of construction machinery, the high reliability of sensors is related not only to the efficient operation of the machinery itself but also to the safety of the construction workers [86]. Therefore, it is necessary to improve the reliability of sensors design and manufacture for application in construction machinery.…”

Section: Concludsions and Prospectsmentioning

confidence: 99%

Overview of Applications of the Sensor Technologies for Construction Machinery

Jiang

2020

IEEE Access

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In recent years, great development in sensor technologies have resulted in substantial progress in the construction efficiency and the degree of automation of construction machinery have made great progress. Applications of the sensor technologies, such as condition monitoring, autonomous construction and the Internet of Things (IoT), have been extensively studied for construction machinery. Firstly, this paper discusses the condition monitoring technology in construction machinery, which mainly involves the monitoring of oil pollution and leakage, vibration monitoring, emission monitoring and wholesystem monitoring. Second, regarding autonomous construction technology, this paper conducts analysis and discussion on linear motion, rotary motion, navigation/positioning systems, and visual systems. Third, research on IoT technology in construction machinery is comprehensively discussed, especially in term of life cycle maintenance, construction management and safety management. Finally, higher reliability, the development of smart sensors and big data management of sensor information are described as prospective issues that must be addressed for future construction machinery. INDEX TERMS Construction equipment, condition based maintenance (CBM), global navigation satellite system (GNSS), building information modelling (BIM), Internet of Things (IoT) This article has been accepted for publication in a future issue of this journal, but has not been fully edited. Content may change prior to final publication.

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“…For example, D. Qu et al [1] investigated the method of compensating the steady flow force and optimized the valve core, consequently enhancing the control precision of the electro-hydraulic proportional relief valve. The problem of anomalous opening of the relief valve under alternating pressure was previously studied and optimized [2][3][4]. Relief valves are also one of the primary causes of vibration and noise in hydraulic systems, which is one of the issues impeding the advancement of hydraulic transmission to high pressure and high speed.…”

Section: Introductionmentioning

confidence: 99%

CFD-Based Cavitation Research and Structure Optimization of Relief Valve for Noise Reduction

Qiu

Tian

et al. 2022

IEEE Access

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The cavitation flow of the cartridge pilot-operated relief valve's main valve port was numerically simulated and studied using Computational Fluid Dynamics (CFD) in our research, and the relief valve structure was modified to decrease cavitation noise. The findings indicate that cavitation in the relief valve occurs mostly downstream of the main valve port and is linked to the wall. Cavitation generation is influenced by the jet at the valve port. The closer the high-speed jet at the valve port is to the valve's inner wall, the more readily cavitation occurs. Conversely, there is less cavitation. This paper reports the effect of the forms and parameters of the main port structure on the jet angle and the morphology of cavitation. The structure of the spool's annular groove has a considerable influence on the cavitation attached to the spool wall and the valve sleeve wall, whereas the outlet position of the relief valve mostly impacts the intensity of cavitation near the valve sleeve wall. Based on this, the relief valve's optimized structure is designed, with which the maximum vapor volume fraction and total vapor volume of the cavitation flow are considerably decreased for various inlet pressures and spool openings. The results of the experiment show that following optimization, the noise of the relief valve drops dramatically, confirming that optimizing the structure has a beneficial impact on decreasing cavitation noise.

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Abnormal Opening Mechanism of Pilot-Operated Relief Valve Under Alternating Pressure

Cited by 6 publications

References 29 publications

A Review of Pilot-operated Hydraulic Valves – Development, Challenges, and a Comparative Study

A Review of Pilot-operated Hydraulic Valves – Development, Challenges, and a Comparative Study

Overview of Applications of the Sensor Technologies for Construction Machinery

CFD-Based Cavitation Research and Structure Optimization of Relief Valve for Noise Reduction

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