Granular or viscous material spray pistol - has air nozzle widening downstream of sharp-edged throat

摘要

The spray pistol is particularly for granular or viscous coating material, having a hollow piston pulled back against a spring by a lever, and through which compressed air is delivered. The downstream end of the piston forms a nozzle and acts as the plug for a stop valve shutting off an annular chamber containing the coating material. The outlet (23) of the air nozzle widens again in the air flow direction after a sharp-edged throat (51).