Zhou, Xiang, and Jinwei Shen. “Automatic Control Design of Pneumatic Solenoid Valve Based on Siemens PLC”. International Journal of Mechanical and Electrical Engineering 4, no. 1 (November 21, 2024): 1–6. Accessed May 24, 2026. https://wepub.org/index.php/IJMEE/article/view/4246.