Guys, may I ask what the valve marked with a red box on the check valve in the picture is?

2018-05-07View Original

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Guys, may I ask what the valve marked with a red box on the check valve in the picture is?

Reply #22018-05-09

Is there a material or installation specification list below the diagram?

Reply #32018-05-10

Oil depot fire protection system: According to the diagram, it should be a backflow preventer

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