Abstract: Disclosed are Variable Displacement Power Controllers and applications generally in the field of fluid powered systems that provide for increased efficiency and effectiveness over known fluid systems, where fluid power generally refers to hydraulic or pneumatic power systems.

Abstract: Compensating and identifying caps and cap assemblies for temporarily capping fittings. Each cap comprises a generally or pseudo cylindrically shaped member that includes a plurality of substantially planar panel segments contiguously connected to form a symmetrical polygonal cup-shape (e.g., a hexagon). One end is closed to complete the formation of the cup. Each cup has an outwardly flaring lip to facilitate mounting on a fitting, and the substantially planar panel segments slope inwardly slightly to facilitate molding and mounting. At the intersection of at least two of the panel segments, there are included resiliently expandable relief recesses so that if the member is force-fit mounted on a fitting slightly larger than its un-expanded dimensions, the material of the relief recesses expands correspondingly to permit such mounting. Pairs of such caps are connected by an easily frangible connecting strip to form assemblies which facilitate concurrent mounting on disengaged ends of tubing connectors.

Abstract: A versatile plastic cap assembly for plugging and/or protecting fittings comprising a joined pair of capping members, one of such capping members being adapted for snap fit onto a male fitting, and the other being adapted for snap fit onto a female fitting. The capping members are initially joined together with an easily breakable connector so as to retain them in pairs until put into use, at which time the two capping members may easily be separated as, for example by pulling or twisting. The invention also includes a method of retaining identification of and temporarily protecting ends of components adapted for connection or re-connection while the ends are disengaged.