In automatic adhesive dosing systems, the dosing nozzles must be cleaned with a cleaning fluid when changing the adhesive. This pump generates a pulse-like high pressure of up to 28 bar, which alsodissolves solid impurities. The pneumatically operated pump has an automatic internal reversing system, eliminating the need for additional control valves. The pumping frequency and pressure are set automatically based on the flow rate. If no medium is removed, the pump stops and then restarts automatically.