Fire extinguishing system comprising a control device for operating the fire extinguishing system, wherein the control device comprises the following: a controller , which serves as an operations centre, wherein the first extinguishing system comprises the following: at least one hose having an extinguishing nozzle arranged at the end of the hose and by means of which an extinguishing fluid conveyed under pressure can be released, a conveying pump for conveying, under pressure, the extinguishing fluid in the hose towards the extinguishing nozzle, a first supply line to the conveying pump from a tank of a fire extinguishing device, in particular a fire engine , a second supply line to the conveying pump from a stationary extinguishing fluid source , wherein a multi-port valve connected upstream of the conveying pump is provided in the region of the first supply line and second supply line , characterized in that the multi-port valve is pressure-controlled, the multi-port valve is connected to the controller via control line means, the multi-port valve can be controlled using the pressure prevailing at the multi-port valve in the second supply line , the pressure prevailing at the multi-port valve in the second supply line can be determined using a pump , and the multi-port valve switches over at a pressure threshold value and the pressure threshold value is adjustable. a controller , which serves as an operations centre, wherein the first extinguishing system comprises the following: at least one hose having an extinguishing nozzle arranged at the end of the hose and by means of which an extinguishing fluid conveyed under pressure can be released, a conveying pump for conveying, under pressure, the extinguishing fluid in the hose towards the extinguishing nozzle, a first supply line to the conveying pump from a tank of a fire extinguishing device, in particular a fire engine , a second supply line to the conveying pump from a stationary extinguishing fluid source , wherein a multi-port valve connected upstream of the conveying pump is provided in the region of the first supply line and second supply line , characterized in that the multi-port valve is pressure-controlled, the multi-port valve is connected to the controller via control line means, the multi-port valve can be controlled using the pressure prevailing at the multi-port valve in the second supply line , the pressure prevailing at the multi-port valve in the second supply line can be determined using a pump , and the multi-port valve switches over at a pressure threshold value and the pressure threshold value is adjustable. at least one hose having an extinguishing nozzle arranged at the end of the hose and by means of which an extinguishing fluid conveyed under pressure can be released, a conveying pump for conveying, under pressure, the extinguishing fluid in the hose towards the extinguishing nozzle, a first supply line to the conveying pump from a tank of a fire extinguishing device, in particular a fire engine , a second supply line to the conveying pump from a stationary extinguishing fluid source , wherein a multi-port valve connected upstream of the conveying pump is provided in the region of the first supply line and second supply line , characterized in that the multi-port valve is pressure-controlled, the multi-port valve is connected to the controller via control line means, the multi-port valve can be controlled using the pressure prevailing at the multi-port valve in the second supply line , the pressure prevailing at the multi-port valve in the second supply line can be determined using a pump , and the multi-port valve switches over at a pressure threshold value and the pressure threshold value is adjustable. <EOS>