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

Authors

  • Essam Elsaed 1) Faculty of Engineering and Natural Sciences, Tampere University, Finland 2) Faculty of Engineering Ain Shams University, Egypt https://orcid.org/0000-0003-3133-4655
  • Matti Linjama Faculty of Engineering and Natural Sciences, Tampere University, Finland

DOI:

https://doi.org/10.13052/ijfp1439-9776.2443

Keywords:

Pilot valves, Multistage valves, large valves, high flow valves, high pressure Pilot-operated valves

Abstract

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 Despite the growing instances of being superseded by the electromechanical counterparts at low power levels, the market was incapable of presenting alternatives for large-size applications.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

Essam Elsaed, 1) Faculty of Engineering and Natural Sciences, Tampere University, Finland 2) Faculty of Engineering Ain Shams University, Egypt

Essam Elsaed received his M.Sc. at Ain Shams University, Egypt, in 2018, Mechanical Engineering Department. Currently, he is a PhD student at the Automation Technology and Mechanical Engineering Unit, Tampere University, Finland. Alternative email: essam.elsaed1@gmail.com

Matti Linjama, Faculty of Engineering and Natural Sciences, Tampere University, Finland

Matti Linjama obtained a D Tech degree at Tampere University of Technology, Finland, in 1998. Currently, he is an adjunct professor at the Automation Technology and Mechanical Engineering Unit, Tampere University. He started the study of digital hydraulics in 2000 and has focused on the topic since then. Currently, he is a leader of the digital hydraulics research group, and his professional interests include the study of hydraulic systems with high performance and energy efficiency.

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Published

2023-11-07

How to Cite

Elsaed, E. ., & Linjama, M. . (2023). A Review of Pilot-operated Hydraulic Valves – Development, Challenges, and a Comparative Study. International Journal of Fluid Power, 24(04), 683–724. https://doi.org/10.13052/ijfp1439-9776.2443

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Original Article