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Regarding the issue of odor addition

2025-11-28View Original

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I would like to ask: after making a hole in the main pipeline for natural gas odorization, a full-bore ball valve is installed, and a blind flange is used to connect the odorization pipe to this valve. The odorization pipe is inserted into the main pipeline through the full-bore ball valve; as a result, the ball valve remains in an open state. So what is the purpose of installing this ball valve (indicated by the arrow in the diagram)?

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