by varying the relative positions of a swash plate and a cylinder block

Full Title

Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders (multi-stage pumps specially adapted for elastic fluids F04B25/00) > having cylinders coaxial with, or parallel or inclined to, main shaft axis > Control > of pumps with rotary cylinder block > by varying the relative positions of a swash plate and a cylinder block