Principles of Operation

In axial piston pumps, the pistons reciprocate parallel to theaxis of rotation of the cylinder block. The simplest type of axial piston pump is the swash plate in-line design.The cylinder block in this pump is turned by the drive shaft.Pistons fitted to bores in the cylinder block are connected through piston shoes and a shoe plate, so that the shoes bear against an angled swash plate. As the block turns, the piston shoes follow the swash plate,causing the pistons to recipro cate. The ports are arranged inthe valve plate so that the pis tons pass the inlet as they are pulled out and pass the outlet as

they are forced back in.

The displacement of axial piston pumps is determined by the size and number of pistons, as well as the stroke length which is determined by the angle of the swash plate. In variable displacement models of the in-line pump, the swash plate is installed in a movable yoke. “Pivoting” the yoke on pintles changes the swash plate angle to increase or decrease the piston stroke.

Rated Characteristics of PVH Industrial Pumps*

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