Abstract: A spraying gun for atomizing, i.e. spraying substances in the liquid state having a closure head for cartridges filled with a compressed gas, and a gun head including a liquid atomizer, a regulating valve and members for operating the valve, the gun having a tubular body formed as a container, which is divided into a gas space and a liquid space by a freely movable member which may be a piston, an elastic spherical member that is filled with a gas under overpressure, or a foil pouch closed at both ends. Various optional features are also disclosed.