To maintain the spool in the head and valve seat rings for tight closure is important.
保持阀芯头与阀座环对中，对于严密关闭是重要的。
Higher water head closure has become a trend with the development of river way closure.
从河道截流的发展趋势来看，高水头截流已成为一种趋势。
Higher water head closure has become a trend with the development of river way closure.
从河道截流的发展趋势来看，高水头截流已成为一种趋势。
应用推荐