Spray nozzle for fluidized bed device

A spray nozzle for a fluidized bed device, said spray nozzle comprising:

• a central liquid outlet for conducting a liquid coating medium therethrough;
• an annular air outlet for conducting a coaxial supply of atomizing air therethrough;
• an enveloping body held in a wall of a housing of the fluidized bed device, said enveloping body having an axial stop and defining a central bore fluidly connected via an air pipe to a source for the atomizing air;
• and
• an axially displaceable nozzle head mounted centrally within the enveloping body and bearable against said axial stop within the central bore, said nozzle head fluidly connected with a liquid pipe to a source for the liquid coating medium, the liquid pipe having a flexible pipe section and being guided centrally within the air pipe and capable of flexing within said air pipe, said liquid pipe mounted so as to be axially displaceable through a lock secured to the air pipe so that as the liquid pipe is displaced axially, the flexible pipe section is capable of flexing.