70% contribution rate through the improvement and control of air leakage problems of pipeline joints such as trailer valves / ABS solenoid valves / high and low-end trachea / seven-way valve joints / transmission relief valves
70% contribution rate for improvement and control of gas leakage problems in pipeline joints such as trailer valve/ABS solenoid valve/high and low gas/seven-way valve/transmission relief valve
70% contribution rate of improvement and control of air leakage in trailer valve / ABS solenoid valve / high and low gear gas pipe / seven way valve joint / transmission pressure reducing valve and other pipeline joints<br>