The innovative valve system eliminates bent or broken SV valves as well as wear on the pump head. Slippage of the pump head is prevented even at high pressure, and unwanted unscrewing of the valve insert is excluded. The pump head engages firmly and audibly with a "Clik." The SCV valve insert remains compatible with SV pumps, and shorter valve shafts are possible. Operation is very simple and intuitive (two-finger operation) Switching to the new system is tool-free, both when replacing DV and SV valve inserts Schwalbe SCV pump head or standard SV pumps are possible Conversion from Sclaverand (SV) to Schwalbe Clik Valce (SCV)