A feeding device for manual dispensing of a food product in fluid form packaged in a flexible container, comprising a dispensing tank adapted to hold the container, an operating sleeve arranged on the outside of the dispensing tank, and a piston arranged inside the dispensing tank and adapted to compress the container, which internal piston comprises at least one outer engagement means adapted to run through at least one slot in the dispensing tank for movable engagement with the inside of the operating sleeve, which operating sleeve comprises on its inside an engaging portion for cooperating with the piston's outer engagement means, so that the operating sleeve is adapted to axially displace the piston by rotation along the inside of the dispensing tank in a discharging direction so that the container is compressed while dispensing food product and adapted to allow and/or alternatively to force a return of the piston in a return direction opposite the discharging direction after each dispensing of food product, which feeding device comprises at least one blocking device adapted to allow axial movement of the piston in only the discharging direction when the operating sleeve moves the piston in the discharging direction by releasable interacting engagement with the dispensing tank, characterized in that the releasable interacting engagement of the at least one blocking device with the dispensing tank is via at least one external spiral track on the dispensing tank, which outer track is adapted to engage with at least one inwardly facing track slider on the at least one blocking device, which engagement after being coupled is adapted so that rotation of the at least one blocking device only allows a rotation thereof in the outer track when the at least one blocking device is in engagement with the outer track and in the blocking position, while a decoupling of the engagement allows axial displacement of the at least one blocking device in relation to the dispensing tank when the at least one blocking device is released with its track slider from its blocking position, and the operating sleeve at a first end comprises one or more inner feeding abutments adapted for releasable engagement with one or more outer feeding means of the at least one blocking device, and in that the at least one blocking device has a passive state when it is released from the blocking position and an active state when it is located in the blocking position which allows axial movement of the piston in the discharging direction when the operating sleeve is rotated in a first rotation direction (F') and allows axial piston movement opposite the discharging direction when the operating sleeve is turned in a rotation direction (R') opposite its first rotation direction (F'). a dispensing tank adapted to hold the container, an operating sleeve arranged on the outside of the dispensing tank, and a piston arranged inside the dispensing tank and adapted to compress the container, which internal piston comprises at least one outer engagement means adapted to run through at least one slot in the dispensing tank for movable engagement with the inside of the operating sleeve, which operating sleeve comprises on its inside an engaging portion for cooperating with the piston's outer engagement means, so that the operating sleeve is adapted to axially displace the piston by rotation along the inside of the dispensing tank in a discharging direction so that the container is compressed while dispensing food product and adapted to allow and/or alternatively to force a return of the piston in a return direction opposite the discharging direction after each dispensing of food product, which feeding device comprises at least one blocking device adapted to allow axial movement of the piston in only the discharging direction when the operating sleeve moves the piston in the discharging direction by releasable interacting engagement with the dispensing tank, characterized in that the releasable interacting engagement of the at least one blocking device with the dispensing tank is via at least one external spiral track on the dispensing tank, which outer track is adapted to engage with at least one inwardly facing track slider on the at least one blocking device, which engagement after being coupled is adapted so that rotation of the at least one blocking device only allows a rotation thereof in the outer track when the at least one blocking device is in engagement with the outer track and in the blocking position, while a decoupling of the engagement allows axial displacement of the at least one blocking device in relation to the dispensing tank when the at least one blocking device is released with its track slider from its blocking position, and the operating sleeve at a first end comprises one or more inner feeding abutments adapted for releasable engagement with one or more outer feeding means of the at least one blocking device, and in that the at least one blocking device has a passive state when it is released from the blocking position and an active state when it is located in the blocking position which allows axial movement of the piston in the discharging direction when the operating sleeve is rotated in a first rotation direction (F') and allows axial piston movement opposite the discharging direction when the operating sleeve is turned in a rotation direction (R') opposite its first rotation direction (F').