Purpose: To test valve No. 1 for tightness against reverse flow.
目的：检测1号止回阀对于回流的密封性。
Requirements: Valve must be tight against reverse flow under all pressure differentials.
要求：在所有压差下，阀门对于回流必须是密封的。
Requirement: Valve must be tight against reverse flow.
要求：这种阀门对于回流必须密封紧密。
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。
Use a check valve to prevent reverse flow into the cylinder.
采用止回阀，防止回流入钢瓶。
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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