ELSAED, E. .; LINJAMA, M. . A Review of Pilot-operated Hydraulic Valves – Development, Challenges, and a Comparative Study. International Journal of Fluid Power, [S. l.], v. 24, n. 04, p. 683–724, 2023. DOI: 10.13052/ijfp1439-9776.2443. Disponível em: https://journals.riverpublishers.com/index.php/IJFP/article/view/15013. Acesso em: 14 aug. 2024.