Elsaed E, Linjama M. A Review of Pilot-operated Hydraulic Valves – Development, Challenges, and a Comparative Study. TJFP [Internet]. 2023 Nov. 7 [cited 2024 Aug. 14];24(04):683-724. Available from: https://journals.riverpublishers.com/index.php/IJFP/article/view/15013