DISPENSING DEVICE FOR LIQUIDS

摘要

A dispensing device for dispensing a predetermined amount of liquid which is supplied to the device under pressure in which the amount of liquid dispensed by the device is determined by a timer which comprises a piston moving within a cylinder whose speed of movement from an open position, in which the flow to the outlet valve is open, to a closed position, in which the flow to the outlet valve is closed, is controlled by a damping mechanism, characterised in that the damping mechanism is a liquid which is pumped by the piston through an orifice, is claimed. The volume which is to be dispensed by the device can conveniently be adjusted by changing the size of said orifice. In a preferred embodiment the invention is suitable for dispensing a predetermined volume of liquid, preferably a solution of agricultural chemicals, for spot application of said chemicals.