an axial piston pump of the swash - plate variety having a rotating cylinder block and pistons movable in a longitudinal direction within bores formed in the block , and having a reversing capacitance for reducing pressure pulsations . for the further reduction of such pulsations , one or more channels , each having an associated discharge opening , are formed into a web of the valve plate of the pump to sequentially couple the reversing capacitance into fluid communication with the cylinder bores passing across the web .