Shanghai wise trend has the capability to design and diagnose the hydraulic control for paper making. we can diagnose and test all hydraulic valves, especially proportional control valve. Our company has a hydraulic system test platform, which can carry out on-line test and Simulation for the hydraulic precise control of shoe press, Wise Sizer, calender, Reel and rewinder, so as to determine whether the valves meet the requirements of on-site system operation or not and find out the malfuction accordingly.