Alfa Laval Corporation Ab

Alfa Laval Corporate Ab

Alfa-laval Separation Ab

Berth I Bodelson

Kjell Klintenstedt

Jan Setterberg

Toini Salmi

Nils-Gunnar Ohlson

Mats B Nordenberg

A centrifugal separator includes a centrifuge rotor mounted to a spindle and includes a rotor casing enclosing a separation space. Peripheral ports extend from the separation space through the rotor casing. A valve slide is movable between a closed position closing the peripheral ports and an open position opening the peripheral ports. A closing chamber is provided between the valve slide and the rotor casing. An inlet channel supplies hydraulic medium to the closing chamber to hold the valve slide in the closed position. An outlet passage permits an outlet flow of the hydraulic medium for moving the valve slide to the open position. The outlet passage includes outlet channels extending though the rotor casing. A valve body is provided in each outlet channel and is axially movable from a closing position to an opening position against the direction of the outlet flow.

Centrifugal separator having a valve body provided in an outlet channel

Centrifugal rotor and a slide for such a rotor

Operating system for centrifugal separator

The rotor of a centrifugal separator has at its periphery a plurality of valves for discharging medium from the interior of the rotor, which interior communicates with the valves through channels. Each valve is opened by a slot through a sleeve-formed section of a first part being uncovered by an edge of a second part of the valve. When the valve is closed, it is kept tight by said edge being pressed against an abutment surface of a seat.

Centrifugal separator with valved outlets

The centrifugal rotor contains a distributor forming a conical wall having openings through which the central inlet chamber is connected to the separating space, the inlet chamber also being connected through a presedimentation space to a peripheral sludge space by way of an annular slot located radially outward from said openings. An annular flexible valve for the slot has one side directed toward the presedimentation space and an opposite side directed toward the peripheral sludge space, the valve being operable to close said slot when subjected to substantially equal liquid pressures on said sides thereof and to open the slot upon creation of a substantial pressure difference on said sides in response to opening of outlets from the peripheral sludge space.

Centrifugal separator with presedimentation means

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Tullinge, Sweden

Berth I Bodelson