The transfer line should be equipped with a non-return valve or other suitable alternative.

转移管线上须配备止回阀之类的装置。

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Can be installed or custom built non-return valve function of the valve.

可安装止回阀或订制自带止回功能的阀。

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Can be installed or custom built non-return valve function of the valve.

可安装止回阀或订制自带止回功能的阀。

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