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。

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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。

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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。

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