Spraying device for liquid means of chemical treatment with replaceable liquid subsystem and spraying systems on the basis thereof

A liquid subsystem for use in a spraying device for liquid means of chemical treatment, mounted on an unmanned vehicle, the liquid subsystem comprising:

• a reservoir for liquid means of chemical treatment, made in a form of a bag, suitable for extruding liquid therefrom under an external overpressure, wherein the reservoir is provided with an outlet channel, at least one liquid hose connected to the reservoir and a corresponding lock valve,
• wherein the liquid subsystem is designed as an entirely replaceable device, further comprising:
• a gasbag capable of transferring said external overpressure to the liquid in the reservoir, wherein said external overpressure is adjustable;
• and
• a manifold with one or more outlet ports, which is connected to the outlet channel of the reservoir through a manifold channel,
• wherein each liquid hose at one end is hermetically connected to one of the manifold outlet ports, and having its corresponding lock valve at the other end, which is closed in a disconnected state,
• wherein a special purging check valve is installed on a common surface shared by the reservoir and the gasbag,
• wherein said special purging check valve prevents passing of liquid from the reservoir into the gasbag, and
• wherein said special purging check valve allows gas to pass from the gasbag into the reservoir if gas pressure in the gasbag exceeds a pressure of the liquid in the reservoir by a certain threshold value.