An apparatus for injection molding, said apparatus comprising - a mold cavity member having a mold cavity, - a melt channel, - an injection chamber and - an injection gate having an injection gate hole, wherein said apparatus further comprises a movable injection sleeve, wherein - said melt channel is configured for providing a flow of molten material from a source of molten material to the injection chamber, - said apparatus is configured for transferring the molten material from the injection chamber to the mold cavity via said injection gate hole, said injection gate being controllable by a forward part of a movable filling valve, and wherein - said injection chamber has a volume that is controllable by movement of the movable injection sleeve, characterised in that said apparatus further comprises - a purge channel for transferring said molten material from said melt channel to said injection chamber, said purge channel being controllable by said movable filling valve, and - at least one injection channel that is controllable by said movable filling valve, and wherein - said movable filling valve configured for controlling said purge channel and said at least one injection channel is reciprocatable between a first position with said at least one injection channel closed and said purge channel open for flow of molten material to said injection chamber and a second position with said at least one injection channel open and said purge channel closed for flow of molten material to said injection chamber. - a mold cavity member having a mold cavity, - a melt channel, - an injection chamber and - an injection gate having an injection gate hole, wherein said apparatus further comprises a movable injection sleeve, wherein - said melt channel is configured for providing a flow of molten material from a source of molten material to the injection chamber, - said apparatus is configured for transferring the molten material from the injection chamber to the mold cavity via said injection gate hole, said injection gate being controllable by a forward part of a movable filling valve, and wherein - said injection chamber has a volume that is controllable by movement of the movable injection sleeve, characterised in that said apparatus further comprises - said melt channel is configured for providing a flow of molten material from a source of molten material to the injection chamber, - said apparatus is configured for transferring the molten material from the injection chamber to the mold cavity via said injection gate hole, said injection gate being controllable by a forward part of a movable filling valve, and wherein - said injection chamber has a volume that is controllable by movement of the movable injection sleeve, - a purge channel for transferring said molten material from said melt channel to said injection chamber, said purge channel being controllable by said movable filling valve, and - at least one injection channel that is controllable by said movable filling valve, and wherein - said movable filling valve configured for controlling said purge channel and said at least one injection channel is reciprocatable between a first position with said at least one injection channel closed and said purge channel open for flow of molten material to said injection chamber and a second position with said at least one injection channel open and said purge channel closed for flow of molten material to said injection chamber.