A valve assembly for a pressurised or pressurisable container of an aerosol spray device, the valve assembly comprising: a housing with internal walls defining a valve chamber, the housing having a housing inlet for fluid communication with fluid in the container; a valve stem having a proximal end and a distal end, the proximal end received in the valve chamber and the distal end projecting through a sealed opening in the valve chamber, the valve stem including an outlet flow conduit with an outlet aperture at the distal end and, more proximally, at least one valve stem inlet (178, 184); a first sealing means disposed within the valve chamber, wherein the first sealing means comprises a ball; a biasing means disposed within the valve chamber; and a second sealing means (148, 548) disposed within the valve chamber, wherein the valve stem is moveable between: a closed position in which the first sealing means is biased against the second sealing means (148, 548) by the biasing means such that the housing inlet is not in fluid communication with the at least one valve stem inlet; and an open position in which the first sealing means is displaced from the second sealing means (148, 548) by the proximal end of the valve stem such that the housing inlet is in fluid communication with the at least one valve stem inlet, wherein, in the open position, a flow path is created from the housing inlet, around the outside of the first sealing means, and to the at least one valve stem inlet (178, 184), and wherein the at least one valve stem inlet comprises one or more slot in a sidewall of the proximal end of the valve stem. a housing with internal walls defining a valve chamber, the housing having a housing inlet for fluid communication with fluid in the container; a valve stem having a proximal end and a distal end, the proximal end received in the valve chamber and the distal end projecting through a sealed opening in the valve chamber, the valve stem including an outlet flow conduit with an outlet aperture at the distal end and, more proximally, at least one valve stem inlet (178, 184); a first sealing means disposed within the valve chamber, wherein the first sealing means comprises a ball; a biasing means disposed within the valve chamber; and a second sealing means (148, 548) disposed within the valve chamber, wherein the valve stem is moveable between: a closed position in which the first sealing means is biased against the second sealing means (148, 548) by the biasing means such that the housing inlet is not in fluid communication with the at least one valve stem inlet; and an open position in which the first sealing means is displaced from the second sealing means (148, 548) by the proximal end of the valve stem such that the housing inlet is in fluid communication with the at least one valve stem inlet, wherein, in the open position, a flow path is created from the housing inlet, around the outside of the first sealing means, and to the at least one valve stem inlet (178, 184), and wherein the at least one valve stem inlet comprises one or more slot in a sidewall of the proximal end of the valve stem. a closed position in which the first sealing means is biased against the second sealing means (148, 548) by the biasing means such that the housing inlet is not in fluid communication with the at least one valve stem inlet; and an open position in which the first sealing means is displaced from the second sealing means (148, 548) by the proximal end of the valve stem such that the housing inlet is in fluid communication with the at least one valve stem inlet, wherein, in the open position, a flow path is created from the housing inlet, around the outside of the first sealing means, and to the at least one valve stem inlet (178, 184), and wherein the at least one valve stem inlet comprises one or more slot in a sidewall of the proximal end of the valve stem.