Patent ID: 8869521
Filing Date: 2014-10-28
Classification: F04B,F16K

Abstract:
1. A fluid working machine for actuating a piston-cylinder hydraulic actuator, said fluid working machine comprising: a housing with a first exterior port, a second exterior port, a third exterior port, and a plurality of cylinders, the plurality of cylinders divided into a first group and a second group; a plurality of pistons, each slideably received in a different cylinder of the plurality of cylinders; a plurality of first valve arrangements, each associated with one cylinder in the first group and selectively providing a first path for fluid to flow between the first exterior port and the one cylinder and selectively providing a second path for fluid to flow between the second exterior port and the one cylinder, each first valve arrangement having: a plurality of second valve arrangements, each associated with a given cylinder in the second group and selectively providing a third path for fluid to flow between the first exterior port and the given cylinder and selectively providing a fourth path for fluid to flow between the third exterior port and the given cylinder, each second valve arrangement having: