DELIVERY DEVICES, SYSTEMS AND METHODS OF USE

A delivery device (5) for injecting a liquid active ingredient formulation (4) into a plant comprises a vessel assembly (51, 52) having a distal side (512) and a proximal side (523), a delivery outlet (53) connected to the distal side (512) of the vessel assembly (51, 52), a product port (57) connected to the distal side (512) of the vessel assembly (51, 52), a dosing piston (511) movably arranged in the vessel assembly (51, 52) such that a variable product chamber (515; 595) is formed between the dosing piston (511) and the distal side (512) of the vessel assembly (51), a directional valve (54) connected to the proximal side (523) of the vessel assembly (51, 52), a proximal chamber (525) limited by the proximal side (523) of the vessel assembly (51, 52) and reciprocally variable relative to the product chamber (515), and a pressure medium port (541) connected to the directional valve (54). The directional valve (54) is configured to switch between a delivery position in which the proximal chamber (525) of the vessel assembly (51, 52) and the pressure medium port (541) are in fluid connection, and a charging position in which the proximal chamber (525) of the vessel assembly (52) and the pressure medium port (541) are fluid tight towards each other.