Piston pump for abrasive conveyances

摘要

The invention relates to reciprocating pumps for liquids and gases, especially fluid-solid dispersions containing abrasives. The cylinder is made from material which is harder than the abrasive particles of the fluid. This cylinder rotates around the piston, independent of the number of strokes per minute, so that a lubricating film is formed. This rotation prevents both contact between the piston and the cylinder and freezing of the piston within the cylinder.