Aiming at the problems of untimely manual flow path switching under abnormal working conditions and long time required for pressure regulation through the PID control of the regulating valves of A-Du-Wu-Shan system. risk analysis was carried out for the two operation modes after transformation. appropriate risk prevention measures were developed. and the superiority of PID control of ... https://macorners.shop/product-category/biscuit-board-and-mug/