Device and method for dispensing a liquid product that is to be sprayed onto a surface

A device for dispensing a liquid product to be sprayed over a surface such as an agricultural field, the device comprising:

• a bar for spraying the liquid product, the bar including several consecutive ducts, each duct forming a longitudinal segment of the bar and having:
• at least one inlet port designed to be in fluid communication with at least one liquid product source;
• and
• at least one outlet port adapted to be in fluid communication with at least one nozzle,
• wherein the device further comprises:
• sensors linked to respective ducts, each sensor being suitable for measuring a physical property making it possible to determine a pressure difference between two respective ducts or a physical property making it possible to determine a pressure inside a respective duct;
• several members designed to vary the pressures inside respective ducts, each member being in fluid communication with at least one inlet port;
• and
• at least one control unit interconnected with the sensors so as to estimate the pressure differences between at least two ducts, said control unit being interconnected with the members so as to drive them to reduce said pressure differences or equalize said pressures.