The device according to the invention consists
of a hollow piston (57) displaceably mounted in a cylinder and a valve member (58) which
is guided by the hollow piston (57) and mounted so as to be axially movable relative to
the hollow piston (57). The valve member (58) is arranged at one end of the hollow piston
(57) inside or immediately in front of the end of the hollow piston (57). The device is
used in a mechanically operated high pressure atomiser. The valve (58) operates without
any auxiliary force, closes very rapidly and is sealed tight against high pressure.
The atomiser is used, for example, to produce an inhalable aerosol of a liquid
medicament without the use of a propellant gas, at 320 bar, for example.