Purpose: To test check valve No. 2 for tightness against reverse flow.

目的：检测止回阀2号对于回流的密封性。

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Use a check valve to prevent reverse flow into the cylinder.

采用止回阀，防止回流入钢瓶。

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Use a check valve to prevent reverse flow into the cylinder.

采用止回阀，防止回流入钢瓶。

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