Method for the expulsion of a plant protection composition and spray gun

A method for the expulsion of a plant protection composition by means of a fluid chamber (3) which communicates with a spray orifice (22) via an electrically activatable fluid valve (48), the method comprising

• setting a pressure and a length of a time interval for the expulsion of the plant protection composition,
• filling the plant protection composition into the fluid chamber (3),
• exerting the previously set pressure on the plant protection composition located in the fluid chamber (3), and
• opening the fluid valve (48) for the previously set time interval by means of an electric control signal and closing the fluid valve (48) after the end of the time interval so that a defined volume or a defined weight of the plant protection composition is expelled through the spray orifice (22).

A spray gun for the expulsion of a fluid having

• a fluid chamber (3),
• a spray orifice (22) which communicates with the fluid chamber (3), and
• a pressure device (1, 2, 4, 16, 17, 18, 56) which is coupled to the fluid chamber (3) and by means of which a pressure can be exerted on the fluid located in the fluid chamber (3),
• wherein
• an electrically activatable fluid valve (48) for opening and closing the passage from the fluid chamber (3) to the spray orifice (22) is arranged at the spray orifice (22) and
• the fluid valve (48) is data-coupled to an electric control device (28) by way of which an electric control signal for opening the fluid valve (48) for a particular previously set time interval and for closing the fluid valve (48) after the end of the time interval can be generated so that a defined volume or a defined weight of the fluid is expelled via the spray orifice (22).