Oil-free high-pressure water pump from Wolfhart

The axial piston design has no bearings in the power train and friction on all other moveable parts is drastically minimized. There are rotating parts only, a cylinder rotor in ceramic and a piston rotor in stainless steel 316. Both rotate intertwined with an inclination angle of 5°.  

Wolfhart's first model has 6cc and delivers 4 Hp at 4000 rpm at 1000 PSI water pressure or delivers as pump 6 GPM water at 1000 PSI and 3600 rpm. This pump is suitable for drinking water.