The impeller is seated with its impeller hub fixed for rotation on a shaft. The drive-side edges of the impeller, turn with slight clearance, over a pump-housing rear wall. The latter forms a labyrinth slot with the impeller. The labyrinth slot connects the pump chamber with a hub chamber.Safety Valves Within the hub chamber, a coaxial vane wheel is connected, fixed for rotation, with the impeller in order to impart a stronger rotary movement to the liquid in the hub chamber and centrifuge it. Safety valves The hub chamber is provided with a peripheral opening for the emergence of the liquid. The air collecting in the region of the shaft escapes through a slot which is formed by the hub housing walland the shaft. The peripheral opening SAFETY VALVES is arranged in the hub-housing wall and developed as a drive nozzle; it debouches into a space adjoining the hub chamber and connected with it by the slot and is directed against the diffuser pipe and forms a liquid jet pump through which the liquid coming from the hub chamber flows.

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2012-01-05

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