多选题 A centrifugal( )pump must not( )operated unless it is fully primed. The pump casing should( )filled before starting, the suction pipe and pipe branch to the discharge stop valve must also( )full. If the water enters the pump suction by gravity, priming is unnecessary and the pump will remain full of water when shut down. To fill the pump, open the small air-valve on the top of the pump casing until water
2025-05-25
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