Dynamics of pilot operated pressure relief valves subjected to fast hydraulic transient

Morselli, Serena; Gessi, Silvia; Marani, Pietro; Martelli, Massimo; Hieronymis, Carlo Maria Rozzi De

doi:10.1063/1.5138849

Cited by 4 publications

(2 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[ [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

View full text Add to dashboard Cite

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 Despite the growing instances of being superseded by the electromechanical counterparts at low power levels, the market was incapable of presenting alternatives for large-size applications.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.

show abstract

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

View full text Add to dashboard Cite

show abstract

“…Some scholars analyzed the dynamic characteristics of the pilot-operated relief valve by theoretical method and Simulink simulation [9][10][11][12][13][14]. Moreover, some scholars analyzed the dynamic characteristics of the pilot-operated relief valve by the theoretical method and AMESim simulation [15][16][17][18][19]. Qing-liang Zeng et al used AMESim and Simulink to analyze dynamic characteristics of the digital large flow emulsion relief valve, respectively [20].…”

Section: Introductionmentioning

confidence: 99%

Characteristic Analysis of Digital Emulsion Relief Valve Based on the Hydraulic Loading System

Wan

Dai

Zeng

et al. 2020

Shock and Vibration

View full text Add to dashboard Cite

In the hydraulic loading system, the performance of digital relief valve plays an important role in the dynamic response of load. However, the research on large-flow emulsion relief valve is still far from perfect. In this paper, digital relief valve is taken as the research object. Based on pilot-operated relief valve, a digital control scheme using a linear stepping motor is adopted to regulate the working pressure of relief valve. The structure of relief valve is analyzed and optimized from the aspects of dynamic and internal flow field characteristics to obtain a good working performance. To obtain its accurate working characteristic, the structural model and digital control system of relief valve are established by AMESim and Simulink, respectively, for electrohydraulic cosimulation. The results show that digital relief valve has a better characteristic of real-time dynamic pressure regulation. Therefore, the digital control system could improve the dynamic performance of relief valve, and the design of digital relief valve structure is reasonable and feasible. The simulation method employed in this paper provides a better theoretical basis and reference for the comprehensive research of digital large-flow emulsion relief valves based on the hydraulic loading system.

show abstract

A Case Study of Open- and Closed-Loop Control of Hydrostatic Transmission with Proportional Valve Start-Up Process

et al. 2022

View full text Add to dashboard Cite

This paper concerns the start-up process of a hydrostatic transmission with a fixed displacement pump, with particular emphasis on dynamic surplus pressure. A numerically controlled transmission using a proportional directional valve was analysed by simulation and experimental verification. The transmission is controlled by the throttle method, and the variable resistance is the throttling gap of the proportional spool valve. A mathematical description of the gear start-up process was obtained using a lumped-parameters model based on ordinary differential equations. The proportional spool valve was described using a modified model, which significantly improved the performance of the model in the closed-loop control process. After assuming the initial conditions and parameterization of the equation coefficients, a simulation of the transition start-up was performed in the MATLAB–Simulink environment. Simulations and experimental studies were carried out for control signals of various shapes and for various feedback from the hydraulic system. The pressure at the pump discharge port and the inlet port of the hydraulic motor, as well as the rotational speed of the hydraulic motor, were analysed in detail as functions of time. In the experimental verification, complete measuring lines for pressure, speed of the hydraulic motor, flow rate, and temperature of the working liquid were used.

show abstract

Dynamics of pilot operated pressure relief valves subjected to fast hydraulic transient

Cited by 4 publications

References 3 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

Characteristic Analysis of Digital Emulsion Relief Valve Based on the Hydraulic Loading System

A Case Study of Open- and Closed-Loop Control of Hydrostatic Transmission with Proportional Valve Start-Up Process

Contact Info

Product

Resources

About