Patent ID: 6161772
Filing Date: 2000-12-19
Classification: B05B

Abstract:
A device for feeding a controlled volume flow of liquid to a spray nozzle for automatic spray application, the device comprising:a conduit defining a flow path from a liquid source to the spray nozzle;a displacement pump type member arranged in the conduit;driving means for driving the displacement pump type member with the movable parts thereof with a speed determined by the actual volume flow through the conduit;means arranged in the conduit upstream of the displacement pump type member and for supplying the flow of liquid through the conduit to the displacement pump type member and for properly feeding the liquid in the conduit;a valve means located in the conduit;means for regulating the volume flow through the conduit by regulating the throttling degree of the valve means;a first means for measuring the pressure of the flow in the conduit downstream of the displacement pump type member;a second means for measuring the pressure of the flow in the conduit upstream of the displacement pump type member; andan arrangement for comparing the pressure values delivered by the two measuring means and on the basis of this comparison controlling the regulating means to influence the valve means for obtaining comparison pressure values corresponding to a volume flow predetermined by the choice of the speed of the movable parts of the displacement pump type member.