The De Laval Separator Company

Kurt Nelson

The sludge outlets of the centrifugal rotor are normally closed by a piston valve which moves axially to open these outlets when operating liquid is drained through openings at the periphery of a closing chamber adjacent the valve, the drain openings being normally closed by a main slide with which the rotor forms an opening chamber. Operating liquid fed to the opening chamber first moves the main slide axially to open the drain openings, thereby effecting opening of the sludge outlets, and then overflows into a third chamber to actuate a second slide and thereby open a drain passage leading from the periphery of the opening chamber into the third chamber, whereby the main slide is returned to its normal position for re-closing the drain openings from the closing chamber.

Centrifuge with automatic sludge discharge

The centrifuge comprises a centrifugal bowl having means for alternately opening and closing its outer periphery to discharge separated sludge intermittently from the separating chamber, there being a stationary paring disk in a paring chamber of the bowl for discharging separated liquid from the bowl while its outer periphery is closed to maintain a normal liquid level in the bowl. The paring chamber has an air passage located radially inward toward the bowl axis from this normal liquid level and adapted to discharge air from the bowl to atmosphere while the liquid is at said normal level, the liquid level moving radially outward in response to opening of the bowl's outer periphery. A dam rotating with the bowl limits this outward movement of the liquid level in the paring chamber so as to maintain therein a minimum liquid level during the sludge discharge, and means in the paring chamber are operable at this minimum liquid level to prevent air from being sucked into the bowl through the air passage during the sludge discharge.

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Wappingers Falls, NY, United States of America

Kurt Nelson