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| Air (white arrows) is drawn into the pump by the vacuum produced as the impeller rotates and is emulsioned with the liquid (blue arrows) contained in the pump casing. The air/liquid mixture is driven into the priming chamber where the air, which is less dense, separates out and vents through the delive line while the liquid, due to the higher density, falls back and is recirculated. When all the air has been evacuated from the suctibn line, the pump primes and operated like a normal centrifugal pump. It can ‘also handle a mixture of a and liquid. The check valve mounted in the pump suction port serves two purposes: it prevents the liquid from draining out of the suction line when the pump is not in operation, and if the suction line is drained by accident, enoug liquid is retained in the pump casing for the pump to reprime. The delivery in must allow the air drawn from the suction line to vent to atmosphere. |  |
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