Measuring Tape,Smart Measuring Tape,Mini Measuring Tape,Retractable Measuring Tape Shangqiu Hengli Measuring Tools Co.,Ltd , https://www.henglimtools.com Improvements in the grinding process play an important role in improving the quality of the plug valve. In the 160 engineering cylinder pistons produced by our factory, it is very beneficial to analyze the problems existing in the manual grinding of the plug valve and the process measures to improve the sealing performance. First, the problems of the manual grinding plug valve Figure 1 and Figure 2 are the piston and valve of the 160 engineering cylinder