拆卸压进去的安全阀阀座和阀座o形环。

Remove the pressed in relief valve seat and seat O-ring.

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在安装系列4700夹管阀时，建议在阀门法兰后面采用镀锌钢支撑环加固。

When installing the Series 4700, it is recommended that galvanized steel back up rings be used behind the valve flanges.

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保持阀芯头与阀座环对中，对于严密关闭是重要的。

To maintain the spool in the head and valve seat rings for tight closure is important.

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