Mixing device and method

A mixing device for mixing a powder-liquid mixture, the mixing device comprising a housing having an inlet and an outlet, a movable body having an interior space and arranged within the housing, with a channel formed between the housing and the movable body and leading to the outlet, and an actuator arranged to move the movable body within the housing, between a closed position and an open position,

• the movable body comprising a body inlet aligned with the inlet of the housing and leading to the interior space, a first body section forming a first part of the interior space and having a first set of openings leading to the channel, and a second body section forming a second part of the interior space and having a second set of openings leading to the channel, wherein
• the housing comprises a sleeve having a covering section arranged to
• cover the second set of openings when the movable body is in the closed position, for minimizing a flow of the mixture through the second set of openings, and
• be offset from the second set of openings when the movable body is in the open position, for allowing the mixture or a cleaning liquid to flow through the second set of openings and into the channel.